diff --git a/app/Http/Controllers/AttachmentController.php b/app/Http/Controllers/AttachmentController.php
index 2268886..3593d32 100644
--- a/app/Http/Controllers/AttachmentController.php
+++ b/app/Http/Controllers/AttachmentController.php
@@ -5,6 +5,7 @@ namespace App\Http\Controllers;
 use App\Models\Attachment;
 use App\Models\AttachmentExtension;
 use App\Models\Post;
+use App\Models\Setting;
 use App\Models\Thread;
 use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
@@ -114,6 +115,8 @@ class AttachmentController extends Controller
         $path = "attachments/{$scopeFolder}/{$filename}";
         Storage::disk($disk)->putFileAs("attachments/{$scopeFolder}", $file, $filename);
 
+        $thumbnailPayload = $this->maybeCreateThumbnail($file, $scopeFolder);
+
         $attachment = Attachment::create([
             'thread_id' => $threadId,
             'post_id' => $postId,
@@ -122,6 +125,9 @@ class AttachmentController extends Controller
             'user_id' => $user->id,
             'disk' => $disk,
             'path' => $path,
+            'thumbnail_path' => $thumbnailPayload['path'] ?? null,
+            'thumbnail_mime_type' => $thumbnailPayload['mime'] ?? null,
+            'thumbnail_size_bytes' => $thumbnailPayload['size'] ?? null,
             'original_name' => $file->getClientOriginalName(),
             'extension' => $extension !== '' ? $extension : null,
             'mime_type' => $mime,
@@ -162,6 +168,28 @@ class AttachmentController extends Controller
         ]);
     }
 
+    public function thumbnail(Attachment $attachment): Response
+    {
+        if (!$this->canViewAttachment($attachment)) {
+            abort(404);
+        }
+
+        if (!$attachment->thumbnail_path) {
+            abort(404);
+        }
+
+        $disk = Storage::disk($attachment->disk);
+        if (!$disk->exists($attachment->thumbnail_path)) {
+            abort(404);
+        }
+
+        $mime = $attachment->thumbnail_mime_type ?: 'image/jpeg';
+
+        return $disk->response($attachment->thumbnail_path, null, [
+            'Content-Type' => $mime,
+        ]);
+    }
+
     public function destroy(Request $request, Attachment $attachment): JsonResponse
     {
         $user = $request->user();
@@ -279,6 +307,8 @@ class AttachmentController extends Controller
 
     private function serializeAttachment(Attachment $attachment): array
     {
+        $isImage = str_starts_with((string) $attachment->mime_type, 'image/');
+
         return [
             'id' => $attachment->id,
             'thread_id' => $attachment->thread_id,
@@ -294,7 +324,159 @@ class AttachmentController extends Controller
             'mime_type' => $attachment->mime_type,
             'size_bytes' => $attachment->size_bytes,
             'download_url' => "/api/attachments/{$attachment->id}/download",
+            'thumbnail_url' => $attachment->thumbnail_path
+                ? "/api/attachments/{$attachment->id}/thumbnail"
+                : null,
+            'is_image' => $isImage,
             'created_at' => $attachment->created_at?->toIso8601String(),
         ];
     }
+
+    private function maybeCreateThumbnail($file, string $scopeFolder): ?array
+    {
+        $enabled = $this->settingBool('attachments.create_thumbnails', true);
+        if (!$enabled) {
+            return null;
+        }
+
+        $mime = $file->getMimeType() ?? '';
+        if (!str_starts_with($mime, 'image/')) {
+            return null;
+        }
+
+        $maxWidth = $this->settingInt('attachments.thumbnail_max_width', 300);
+        $maxHeight = $this->settingInt('attachments.thumbnail_max_height', 300);
+        if ($maxWidth <= 0 || $maxHeight <= 0) {
+            return null;
+        }
+
+        $sourcePath = $file->getPathname();
+        $info = @getimagesize($sourcePath);
+        if (!$info) {
+            return null;
+        }
+
+        [$width, $height] = $info;
+        if ($width <= 0 || $height <= 0) {
+            return null;
+        }
+
+        if ($width <= $maxWidth && $height <= $maxHeight) {
+            return null;
+        }
+
+        $ratio = min($maxWidth / $width, $maxHeight / $height);
+        $targetWidth = max(1, (int) round($width * $ratio));
+        $targetHeight = max(1, (int) round($height * $ratio));
+
+        $sourceImage = $this->createImageFromFile($sourcePath, $mime);
+        if (!$sourceImage) {
+            return null;
+        }
+
+        $thumbImage = imagecreatetruecolor($targetWidth, $targetHeight);
+        if (!$thumbImage) {
+            imagedestroy($sourceImage);
+            return null;
+        }
+
+        if (in_array($mime, ['image/png', 'image/gif'], true)) {
+            imagecolortransparent($thumbImage, imagecolorallocatealpha($thumbImage, 0, 0, 0, 127));
+            imagealphablending($thumbImage, false);
+            imagesavealpha($thumbImage, true);
+        }
+
+        imagecopyresampled(
+            $thumbImage,
+            $sourceImage,
+            0,
+            0,
+            0,
+            0,
+            $targetWidth,
+            $targetHeight,
+            $width,
+            $height
+        );
+
+        $quality = $this->settingInt('attachments.thumbnail_quality', 85);
+        $thumbBinary = $this->renderImageBinary($thumbImage, $mime, $quality);
+
+        imagedestroy($sourceImage);
+        imagedestroy($thumbImage);
+
+        if ($thumbBinary === null) {
+            return null;
+        }
+
+        $filename = Str::uuid()->toString();
+        $extension = strtolower((string) $file->getClientOriginalExtension());
+        if ($extension !== '') {
+            $filename .= ".{$extension}";
+        }
+
+        $disk = 'local';
+        $thumbPath = "attachments/{$scopeFolder}/thumbs/{$filename}";
+        Storage::disk($disk)->put($thumbPath, $thumbBinary);
+
+        return [
+            'path' => $thumbPath,
+            'mime' => $mime,
+            'size' => strlen($thumbBinary),
+        ];
+    }
+
+    private function createImageFromFile(string $path, string $mime)
+    {
+        return match ($mime) {
+            'image/jpeg', 'image/jpg' => @imagecreatefromjpeg($path),
+            'image/png' => @imagecreatefrompng($path),
+            'image/gif' => @imagecreatefromgif($path),
+            'image/webp' => function_exists('imagecreatefromwebp') ? @imagecreatefromwebp($path) : null,
+            default => null,
+        };
+    }
+
+    private function renderImageBinary($image, string $mime, int $quality): ?string
+    {
+        ob_start();
+        $success = false;
+
+        if (in_array($mime, ['image/jpeg', 'image/jpg'], true)) {
+            $success = imagejpeg($image, null, max(10, min(95, $quality)));
+        } elseif ($mime === 'image/png') {
+            $compression = (int) round(9 - (max(10, min(95, $quality)) / 100) * 9);
+            $success = imagepng($image, null, $compression);
+        } elseif ($mime === 'image/gif') {
+            $success = imagegif($image);
+        } elseif ($mime === 'image/webp' && function_exists('imagewebp')) {
+            $success = imagewebp($image, null, max(10, min(95, $quality)));
+        }
+
+        $data = ob_get_clean();
+
+        if (!$success) {
+            return null;
+        }
+
+        return $data !== false ? $data : null;
+    }
+
+    private function settingBool(string $key, bool $default): bool
+    {
+        $value = Setting::query()->where('key', $key)->value('value');
+        if ($value === null) {
+            return $default;
+        }
+        return in_array(strtolower($value), ['1', 'true', 'yes', 'on'], true);
+    }
+
+    private function settingInt(string $key, int $default): int
+    {
+        $value = Setting::query()->where('key', $key)->value('value');
+        if ($value === null) {
+            return $default;
+        }
+        return (int) $value;
+    }
 }
diff --git a/app/Http/Controllers/PostController.php b/app/Http/Controllers/PostController.php
index 8b252a0..32e9b60 100644
--- a/app/Http/Controllers/PostController.php
+++ b/app/Http/Controllers/PostController.php
@@ -5,6 +5,7 @@ namespace App\Http\Controllers;
 use App\Actions\BbcodeFormatter;
 use App\Models\Post;
 use App\Models\Thread;
+use App\Models\Setting;
 use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
 use Illuminate\Support\Facades\Storage;
@@ -132,6 +133,10 @@ class PostController extends Controller
                         'mime_type' => $attachment->mime_type,
                         'size_bytes' => $attachment->size_bytes,
                         'download_url' => "/api/attachments/{$attachment->id}/download",
+                        'thumbnail_url' => $attachment->thumbnail_path
+                            ? "/api/attachments/{$attachment->id}/thumbnail"
+                            : null,
+                        'is_image' => str_starts_with((string) $attachment->mime_type, 'image/'),
                         'created_at' => $attachment->created_at?->toIso8601String(),
                     ])
                     ->values()
@@ -175,13 +180,22 @@ class PostController extends Controller
             $entry = $map[$key];
             $url = $entry['url'];
             $mime = $entry['mime'] ?? '';
-            if (str_starts_with($mime, 'image/')) {
+            if (str_starts_with($mime, 'image/') && $this->displayImagesInline()) {
                 return "[img]{$url}[/img]";
             }
             return "[url={$url}]{$rawName}[/url]";
         }, $body) ?? $body;
     }
 
+    private function displayImagesInline(): bool
+    {
+        $value = Setting::query()->where('key', 'attachments.display_images_inline')->value('value');
+        if ($value === null) {
+            return true;
+        }
+        return in_array(strtolower($value), ['1', 'true', 'yes', 'on'], true);
+    }
+
     private function resolveGroupColor(?\App\Models\User $user): ?string
     {
         if (!$user) {
diff --git a/app/Http/Controllers/ThreadController.php b/app/Http/Controllers/ThreadController.php
index e813165..f5963d4 100644
--- a/app/Http/Controllers/ThreadController.php
+++ b/app/Http/Controllers/ThreadController.php
@@ -5,6 +5,7 @@ namespace App\Http\Controllers;
 use App\Models\Forum;
 use App\Models\Thread;
 use App\Actions\BbcodeFormatter;
+use App\Models\Setting;
 use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
 use Illuminate\Support\Facades\DB;
@@ -207,6 +208,10 @@ class ThreadController extends Controller
                         'mime_type' => $attachment->mime_type,
                         'size_bytes' => $attachment->size_bytes,
                         'download_url' => "/api/attachments/{$attachment->id}/download",
+                        'thumbnail_url' => $attachment->thumbnail_path
+                            ? "/api/attachments/{$attachment->id}/thumbnail"
+                            : null,
+                        'is_image' => str_starts_with((string) $attachment->mime_type, 'image/'),
                         'created_at' => $attachment->created_at?->toIso8601String(),
                     ])
                     ->values()
@@ -250,13 +255,22 @@ class ThreadController extends Controller
             $entry = $map[$key];
             $url = $entry['url'];
             $mime = $entry['mime'] ?? '';
-            if (str_starts_with($mime, 'image/')) {
+            if (str_starts_with($mime, 'image/') && $this->displayImagesInline()) {
                 return "[img]{$url}[/img]";
             }
             return "[url={$url}]{$rawName}[/url]";
         }, $body) ?? $body;
     }
 
+    private function displayImagesInline(): bool
+    {
+        $value = Setting::query()->where('key', 'attachments.display_images_inline')->value('value');
+        if ($value === null) {
+            return true;
+        }
+        return in_array(strtolower($value), ['1', 'true', 'yes', 'on'], true);
+    }
+
     private function resolveGroupColor(?\App\Models\User $user): ?string
     {
         if (!$user) {
diff --git a/app/Models/Attachment.php b/app/Models/Attachment.php
index 42fd5af..05f0112 100644
--- a/app/Models/Attachment.php
+++ b/app/Models/Attachment.php
@@ -33,6 +33,9 @@ class Attachment extends Model
         'user_id',
         'disk',
         'path',
+        'thumbnail_path',
+        'thumbnail_mime_type',
+        'thumbnail_size_bytes',
         'original_name',
         'extension',
         'mime_type',
@@ -41,6 +44,7 @@ class Attachment extends Model
 
     protected $casts = [
         'size_bytes' => 'int',
+        'thumbnail_size_bytes' => 'int',
     ];
 
     public function thread(): BelongsTo
diff --git a/database/migrations/2026_01_29_000100_add_attachment_thumbnails.php b/database/migrations/2026_01_29_000100_add_attachment_thumbnails.php
new file mode 100644
index 0000000..406f506
--- /dev/null
+++ b/database/migrations/2026_01_29_000100_add_attachment_thumbnails.php
@@ -0,0 +1,24 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('attachments', function (Blueprint $table) {
+            $table->string('thumbnail_path')->nullable()->after('path');
+            $table->string('thumbnail_mime_type', 150)->nullable()->after('thumbnail_path');
+            $table->unsignedBigInteger('thumbnail_size_bytes')->nullable()->after('thumbnail_mime_type');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('attachments', function (Blueprint $table) {
+            $table->dropColumn(['thumbnail_path', 'thumbnail_mime_type', 'thumbnail_size_bytes']);
+        });
+    }
+};
diff --git a/package-lock.json b/package-lock.json
index 04e067c..63d9a1b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2072,18 +2072,6 @@
                 "node": ">=6"
             }
         },
-        "node_modules/detect-libc": {
-            "version": "2.1.2",
-            "resolved": "https://registry.npmjs.org/detect-libc/-/detect-libc-2.1.2.tgz",
-            "integrity": "sha512-Btj2BOOO83o3WyH59e8MgXsxEQVcarkUOpEYrubB0urwnN10yQ364rsiByU11nZlqWYZm05i/of7io4mzihBtQ==",
-            "dev": true,
-            "license": "Apache-2.0",
-            "optional": true,
-            "peer": true,
-            "engines": {
-                "node": ">=8"
-            }
-        },
         "node_modules/dom-helpers": {
             "version": "5.2.1",
             "resolved": "https://registry.npmjs.org/dom-helpers/-/dom-helpers-5.2.1.tgz",
@@ -2888,18 +2876,6 @@
             "dev": true,
             "license": "ISC"
         },
-        "node_modules/jiti": {
-            "version": "2.6.1",
-            "resolved": "https://registry.npmjs.org/jiti/-/jiti-2.6.1.tgz",
-            "integrity": "sha512-ekilCSN1jwRvIbgeg/57YFh8qQDNbwDb9xT/qu2DAHbFFZUicIl4ygVaAvzveMhMVr3LnpSKTNnwt8PoOfmKhQ==",
-            "dev": true,
-            "license": "MIT",
-            "optional": true,
-            "peer": true,
-            "bin": {
-                "jiti": "lib/jiti-cli.mjs"
-            }
-        },
         "node_modules/js-tokens": {
             "version": "4.0.0",
             "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz",
@@ -3010,280 +2986,6 @@
                 "node": ">= 0.8.0"
             }
         },
-        "node_modules/lightningcss": {
-            "version": "1.30.2",
-            "resolved": "https://registry.npmjs.org/lightningcss/-/lightningcss-1.30.2.tgz",
-            "integrity": "sha512-utfs7Pr5uJyyvDETitgsaqSyjCb2qNRAtuqUeWIAKztsOYdcACf2KtARYXg2pSvhkt+9NfoaNY7fxjl6nuMjIQ==",
-            "dev": true,
-            "license": "MPL-2.0",
-            "optional": true,
-            "peer": true,
-            "dependencies": {
-                "detect-libc": "^2.0.3"
-            },
-            "engines": {
-                "node": ">= 12.0.0"
-            },
-            "funding": {
-                "type": "opencollective",
-                "url": "https://opencollective.com/parcel"
-            },
-            "optionalDependencies": {
-                "lightningcss-android-arm64": "1.30.2",
-                "lightningcss-darwin-arm64": "1.30.2",
-                "lightningcss-darwin-x64": "1.30.2",
-                "lightningcss-freebsd-x64": "1.30.2",
-                "lightningcss-linux-arm-gnueabihf": "1.30.2",
-                "lightningcss-linux-arm64-gnu": "1.30.2",
-                "lightningcss-linux-arm64-musl": "1.30.2",
-                "lightningcss-linux-x64-gnu": "1.30.2",
-                "lightningcss-linux-x64-musl": "1.30.2",
-                "lightningcss-win32-arm64-msvc": "1.30.2",
-                "lightningcss-win32-x64-msvc": "1.30.2"
-            }
-        },
-        "node_modules/lightningcss-android-arm64": {
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-                "x64"
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-            "dev": true,
-            "license": "MPL-2.0",
-            "optional": true,
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-                "linux"
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-        "node_modules/lightningcss-linux-x64-musl": {
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-                "type": "opencollective",
-                "url": "https://opencollective.com/parcel"
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-        },
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diff --git a/resources/js/index.css b/resources/js/index.css
index e7e33f2..73ebc11 100644
--- a/resources/js/index.css
+++ b/resources/js/index.css
@@ -2176,7 +2176,57 @@ a {
 }
 
 .bb-acp {
-  max-width: 1880px;
+  max-width: 100%;
+}
+
+.bb-acp-sidebar {
+  position: sticky;
+  top: 1rem;
+  display: flex;
+  flex-direction: column;
+  gap: 1rem;
+}
+
+.bb-acp-sidebar-section {
+  background: rgba(16, 20, 30, 0.7);
+  border: 1px solid rgba(255, 255, 255, 0.08);
+  border-radius: 10px;
+  padding: 0.75rem;
+}
+
+.bb-acp-sidebar-title {
+  font-size: 0.75rem;
+  text-transform: uppercase;
+  letter-spacing: 0.08em;
+  color: var(--bb-ink-muted);
+  margin-bottom: 0.5rem;
+}
+
+.bb-acp-sidebar .list-group-item {
+  background: transparent;
+  color: var(--bb-ink);
+  border: 0;
+  padding: 0.35rem 0.25rem;
+}
+
+.bb-acp-sidebar .list-group-item.is-active,
+.bb-acp-sidebar .list-group-item:hover {
+  color: var(--bb-accent, #f29b3f);
+}
+
+.bb-acp-panel {
+  background: rgba(18, 23, 33, 0.8);
+  border: 1px solid rgba(255, 255, 255, 0.08);
+  border-radius: 12px;
+}
+
+.bb-acp-panel-header {
+  padding: 0.9rem 1rem;
+  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
+}
+
+.bb-acp-panel-body {
+  padding: 1rem;
 }
 
 .bb-icon {
@@ -2287,30 +2337,29 @@ a {
 }
 
 .bb-attachment-extension-table {
-  display: flex;
-  flex-direction: column;
-  gap: 0.4rem;
+  border-radius: 12px;
+  border: 1px solid rgba(255, 255, 255, 0.08);
+  overflow: hidden;
+  background: rgba(18, 23, 33, 0.8);
 }
 
-.bb-attachment-extension-header,
-.bb-attachment-extension-row {
-  display: grid;
-  grid-template-columns: minmax(120px, 0.8fr) minmax(200px, 1.2fr) minmax(180px, 1fr) auto;
-  gap: 0.75rem;
-  align-items: center;
-  padding: 0.5rem 0.8rem;
-  border-radius: 10px;
+.bb-attachment-extension-table table {
+  margin-bottom: 0;
+  color: var(--bb-ink);
 }
 
-.bb-attachment-extension-header {
+.bb-attachment-extension-table thead th {
   font-size: 0.8rem;
   color: var(--bb-ink-muted);
   background: rgba(15, 19, 27, 0.7);
+  border-bottom: 0;
+  padding: 0.55rem 0.8rem;
 }
 
-.bb-attachment-extension-row {
-  background: rgba(18, 23, 33, 0.8);
-  border: 1px solid rgba(255, 255, 255, 0.08);
+.bb-attachment-extension-table tbody td {
+  border-top: 1px solid rgba(255, 255, 255, 0.08);
+  padding: 0.55rem 0.8rem;
+  vertical-align: middle;
 }
 
 .bb-attachment-extension-name {
@@ -2343,16 +2392,6 @@ a {
   .bb-attachment-extension-form {
     grid-template-columns: 1fr;
   }
-
-  .bb-attachment-extension-header,
-  .bb-attachment-extension-row {
-    grid-template-columns: 1fr;
-    gap: 0.4rem;
-  }
-
-  .bb-attachment-extension-actions {
-    justify-content: flex-start;
-  }
 }
 
 .bb-rank-main img {
diff --git a/resources/js/pages/Acp.jsx b/resources/js/pages/Acp.jsx
index 35c633b..a9f4ff8 100644
--- a/resources/js/pages/Acp.jsx
+++ b/resources/js/pages/Acp.jsx
@@ -116,6 +116,14 @@ export default function Acp({ isAdmin }) {
     const [attachmentExtensionSaving, setAttachmentExtensionSaving] = useState(false)
     const [attachmentExtensionSavingId, setAttachmentExtensionSavingId] = useState(null)
     const [attachmentSeedSaving, setAttachmentSeedSaving] = useState(false)
+    const [attachmentSettingsSaving, setAttachmentSettingsSaving] = useState(false)
+    const [attachmentSettings, setAttachmentSettings] = useState({
+        display_images_inline: 'true',
+        create_thumbnails: 'true',
+        thumbnail_max_width: '300',
+        thumbnail_max_height: '300',
+        thumbnail_quality: '85',
+    })
     const [showAttachmentExtensionModal, setShowAttachmentExtensionModal] = useState(false)
     const [attachmentExtensionEdit, setAttachmentExtensionEdit] = useState(null)
     const [showAttachmentExtensionDelete, setShowAttachmentExtensionDelete] = useState(false)
@@ -241,6 +249,13 @@ export default function Acp({ isAdmin }) {
                     favicon_256: settingsMap.get('favicon_256') || '',
                 }
                 setGeneralSettings(next)
+                setAttachmentSettings({
+                    display_images_inline: settingsMap.get('attachments.display_images_inline') || 'true',
+                    create_thumbnails: settingsMap.get('attachments.create_thumbnails') || 'true',
+                    thumbnail_max_width: settingsMap.get('attachments.thumbnail_max_width') || '300',
+                    thumbnail_max_height: settingsMap.get('attachments.thumbnail_max_height') || '300',
+                    thumbnail_quality: settingsMap.get('attachments.thumbnail_quality') || '85',
+                })
             } catch (err) {
                 if (active) setGeneralError(err.message)
             }
@@ -297,6 +312,24 @@ export default function Acp({ isAdmin }) {
         }
     }
 
+    const handleAttachmentSettingsSave = async (event) => {
+        event.preventDefault()
+        setAttachmentSettingsSaving(true)
+        setAttachmentGroupsError('')
+        try {
+            await saveSettings(
+                Object.entries(attachmentSettings).map(([key, value]) => ({
+                    key: `attachments.${key}`,
+                    value: typeof value === 'string' ? value.trim() : String(value ?? ''),
+                }))
+            )
+        } catch (err) {
+            setAttachmentGroupsError(err.message)
+        } finally {
+            setAttachmentSettingsSaving(false)
+        }
+    }
+
     const handleLogoUpload = async (file, settingKey) => {
         if (!file) return
         setGeneralUploading(true)
@@ -1656,44 +1689,60 @@ export default function Acp({ isAdmin }) {
                                 className="bb-attachment-extension-table"
                                 style={{ marginLeft: (depth + 1) * 16 }}
                             >
-                                <div className="bb-attachment-extension-header tr-header">
-                                    <span>{t('attachment.extension')}</span>
-                                    <span>{t('attachment.allowed_mimes')}</span>
-                                    <span>{t('attachment.extension_group')}</span>
-                                    <span>{t('attachment.actions')}</span>
-                                </div>
-                                {groupExtensions.map((extension) => (
-                                    <div key={extension.id} className="bb-attachment-extension-row">
-                                        <span className="bb-attachment-extension-name">
-                                            {extension.extension}
-                                        </span>
-                                        <span className="bb-attachment-extension-meta">
-                                            {(extension.allowed_mimes || []).join(', ')}
-                                        </span>
-                                        <span className="bb-attachment-extension-meta">
-                                            {attachmentGroups.find((group) => group.id === extension.attachment_group_id)?.name
-                                                || t('attachment.extension_unassigned')}
-                                        </span>
-                                        <div className="bb-attachment-extension-actions">
-                                            <ButtonGroup size="sm" className="bb-action-group">
-                                                <Button
-                                                    variant="dark"
-                                                    onClick={() => openAttachmentExtensionEdit(extension)}
-                                                    disabled={attachmentExtensionSaving}
-                                                >
-                                                    <i className="bi bi-pencil" aria-hidden="true" />
-                                                </Button>
-                                                <Button
-                                                    variant="dark"
-                                                    onClick={() => handleAttachmentExtensionDelete(extension)}
-                                                    disabled={attachmentExtensionSaving}
-                                                >
-                                                    <i className="bi bi-trash" aria-hidden="true" />
-                                                </Button>
-                                            </ButtonGroup>
-                                        </div>
-                                    </div>
-                                ))}
+                                <table className="table table-sm mb-0">
+                                    <thead className="tr-header">
+                                        <tr>
+                                            <th scope="col" className="text-start">
+                                                {t('attachment.extension')}
+                                            </th>
+                                            <th scope="col" className="text-start">
+                                                {t('attachment.allowed_mimes')}
+                                            </th>
+                                            <th scope="col" className="text-start">
+                                                {t('attachment.extension_group')}
+                                            </th>
+                                            <th scope="col" className="text-start">
+                                                {t('attachment.actions')}
+                                            </th>
+                                        </tr>
+                                    </thead>
+                                    <tbody>
+                                        {groupExtensions.map((extension) => (
+                                            <tr key={extension.id} className="bb-attachment-extension-row">
+                                                <td className="bb-attachment-extension-name text-start">
+                                                    {extension.extension}
+                                                </td>
+                                                <td className="bb-attachment-extension-meta text-start">
+                                                    {(extension.allowed_mimes || []).join(', ')}
+                                                </td>
+                                                <td className="bb-attachment-extension-meta text-start">
+                                                    {attachmentGroups.find((group) => group.id === extension.attachment_group_id)?.name
+                                                        || t('attachment.extension_unassigned')}
+                                                </td>
+                                                <td>
+                                                    <div className="bb-attachment-extension-actions">
+                                                        <ButtonGroup size="sm" className="bb-action-group">
+                                                            <Button
+                                                                variant="dark"
+                                                                onClick={() => openAttachmentExtensionEdit(extension)}
+                                                                disabled={attachmentExtensionSaving}
+                                                            >
+                                                                <i className="bi bi-pencil" aria-hidden="true" />
+                                                            </Button>
+                                                            <Button
+                                                                variant="dark"
+                                                                onClick={() => handleAttachmentExtensionDelete(extension)}
+                                                                disabled={attachmentExtensionSaving}
+                                                            >
+                                                                <i className="bi bi-trash" aria-hidden="true" />
+                                                            </Button>
+                                                        </ButtonGroup>
+                                                    </div>
+                                                </td>
+                                            </tr>
+                                        ))}
+                                    </tbody>
+                                </table>
                             </div>
                         )}
                     </div>
@@ -2143,297 +2192,376 @@ export default function Acp({ isAdmin }) {
             <h2 className="mb-4">{t('acp.title')}</h2>
             <Tabs defaultActiveKey="general" className="mb-3">
                 <Tab eventKey="general" title={t('acp.general')}>
-                    <p className="bb-muted">{t('acp.general_hint')}</p>
-                    {generalError && <p className="text-danger">{generalError}</p>}
-                    <Form onSubmit={handleGeneralSave} className="bb-acp-general">
-                        <Row className="g-3">
-                            <Col lg={6}>
-                                <Form.Group>
-                                    <Form.Label>{t('acp.forum_name')}</Form.Label>
-                                    <Form.Control
-                                        type="text"
-                                        value={generalSettings.forum_name}
-                                        onChange={(event) =>
-                                            setGeneralSettings((prev) => ({ ...prev, forum_name: event.target.value }))
-                                        }
-                                    />
-                                </Form.Group>
-                                <Form.Group className="mt-2">
-                                    <Form.Check
-                                        type="checkbox"
-                                        id="acp-show-header-name"
-                                        label={t('acp.show_header_name')}
-                                        checked={generalSettings.show_header_name !== 'false'}
-                                        onChange={(event) =>
-                                            setGeneralSettings((prev) => ({
-                                                ...prev,
-                                                show_header_name: event.target.checked ? 'true' : 'false',
-                                            }))
-                                        }
-                                    />
-                                </Form.Group>
-                            </Col>
-                            <Col lg={6}>
-                                <Form.Group>
-                                    <Form.Label>{t('acp.default_theme')}</Form.Label>
-                                    <Form.Select
-                                        value={generalSettings.default_theme}
-                                        onChange={(event) => handleDefaultThemeChange(event.target.value)}
-                                    >
-                                        <option value="auto">{t('ucp.system_default')}</option>
-                                        <option value="dark">{t('nav.theme_dark')}</option>
-                                        <option value="light">{t('nav.theme_light')}</option>
-                                    </Form.Select>
-                                </Form.Group>
-                            </Col>
-                            <Col lg={6}>
-                                <Form.Group>
-                                    <Form.Label>{t('acp.accent_dark')}</Form.Label>
-                                    <div className="d-flex align-items-center gap-2">
-                                        <Form.Control
-                                            type="text"
-                                            value={generalSettings.accent_color_dark}
-                                            onChange={(event) =>
-                                                setGeneralSettings((prev) => ({
-                                                    ...prev,
-                                                    accent_color_dark: event.target.value,
-                                                }))
-                                            }
-                                            placeholder="#f29b3f"
-                                        />
-                                        <Form.Control
-                                            type="color"
-                                            value={generalSettings.accent_color_dark || '#f29b3f'}
-                                            onChange={(event) =>
-                                                setGeneralSettings((prev) => ({
-                                                    ...prev,
-                                                    accent_color_dark: event.target.value,
-                                                }))
-                                            }
-                                        />
+                    <Row className="g-4">
+                        <Col lg={3} xl={2}>
+                            <div className="bb-acp-sidebar">
+                                <div className="bb-acp-sidebar-section">
+                                    <div className="bb-acp-sidebar-title">{t('acp.quick_access')}</div>
+                                    <div className="list-group">
+                                        <button type="button" className="list-group-item list-group-item-action">
+                                            {t('acp.users')}
+                                        </button>
+                                        <button type="button" className="list-group-item list-group-item-action">
+                                            {t('acp.groups')}
+                                        </button>
+                                        <button type="button" className="list-group-item list-group-item-action">
+                                            {t('acp.forums')}
+                                        </button>
+                                        <button type="button" className="list-group-item list-group-item-action">
+                                            {t('acp.ranks')}
+                                        </button>
+                                        <button type="button" className="list-group-item list-group-item-action">
+                                            {t('acp.attachments')}
+                                        </button>
                                     </div>
-                                </Form.Group>
-                            </Col>
-                            <Col lg={6}>
-                                <Form.Group>
-                                    <Form.Label>{t('acp.accent_light')}</Form.Label>
-                                    <div className="d-flex align-items-center gap-2">
-                                        <Form.Control
-                                            type="text"
-                                            value={generalSettings.accent_color_light}
-                                            onChange={(event) =>
-                                                setGeneralSettings((prev) => ({
-                                                    ...prev,
-                                                    accent_color_light: event.target.value,
-                                                }))
-                                            }
-                                            placeholder="#f29b3f"
-                                        />
-                                        <Form.Control
-                                            type="color"
-                                            value={generalSettings.accent_color_light || '#f29b3f'}
-                                            onChange={(event) =>
-                                                setGeneralSettings((prev) => ({
-                                                    ...prev,
-                                                    accent_color_light: event.target.value,
-                                                }))
-                                            }
-                                        />
+                                </div>
+                                <div className="bb-acp-sidebar-section">
+                                    <div className="bb-acp-sidebar-title">{t('acp.board_configuration')}</div>
+                                    <div className="list-group">
+                                        <button type="button" className="list-group-item list-group-item-action is-active">
+                                            {t('acp.general')}
+                                        </button>
+                                        <button type="button" className="list-group-item list-group-item-action">
+                                            {t('acp.forums')}
+                                        </button>
+                                        <button type="button" className="list-group-item list-group-item-action">
+                                            {t('acp.users')}
+                                        </button>
                                     </div>
-                                </Form.Group>
-                            </Col>
-                            <Col lg={6}>
-                                <Form.Group>
-                                    <Form.Label>{t('acp.logo_dark')}</Form.Label>
-                                    <div
-                                        {...darkLogoDropzone.getRootProps({
-                                            className: 'bb-dropzone',
-                                        })}
-                                    >
-                                        <input {...darkLogoDropzone.getInputProps()} />
-                                        {generalSettings.logo_dark ? (
-                                            <div className="bb-dropzone-preview">
-                                                <img src={generalSettings.logo_dark} alt={t('acp.logo_dark')} />
-                                            </div>
-                                        ) : (
-                                            <div className="bb-dropzone-placeholder">
-                                                <i className="bi bi-upload" aria-hidden="true" />
-                                                <span>{t('acp.logo_upload')}</span>
-                                            </div>
-                                        )}
+                                </div>
+                                <div className="bb-acp-sidebar-section">
+                                    <div className="bb-acp-sidebar-title">{t('acp.client_communication')}</div>
+                                    <div className="list-group">
+                                        <button type="button" className="list-group-item list-group-item-action">
+                                            {t('acp.authentication')}
+                                        </button>
+                                        <button type="button" className="list-group-item list-group-item-action">
+                                            {t('acp.email_settings')}
+                                        </button>
                                     </div>
-                                </Form.Group>
-                            </Col>
-                            <Col lg={6}>
-                                <Form.Group>
-                                    <Form.Label>{t('acp.logo_light')}</Form.Label>
-                                    <div
-                                        {...lightLogoDropzone.getRootProps({
-                                            className: 'bb-dropzone',
-                                        })}
-                                    >
-                                        <input {...lightLogoDropzone.getInputProps()} />
-                                        {generalSettings.logo_light ? (
-                                            <div className="bb-dropzone-preview">
-                                                <img src={generalSettings.logo_light} alt={t('acp.logo_light')} />
-                                            </div>
-                                        ) : (
-                                            <div className="bb-dropzone-placeholder">
-                                                <i className="bi bi-upload" aria-hidden="true" />
-                                                <span>{t('acp.logo_upload')}</span>
-                                            </div>
-                                        )}
+                                </div>
+                                <div className="bb-acp-sidebar-section">
+                                    <div className="bb-acp-sidebar-title">{t('acp.server_configuration')}</div>
+                                    <div className="list-group">
+                                        <button type="button" className="list-group-item list-group-item-action">
+                                            {t('acp.security_settings')}
+                                        </button>
+                                        <button type="button" className="list-group-item list-group-item-action">
+                                            {t('acp.search_settings')}
+                                        </button>
                                     </div>
-                                </Form.Group>
-                            </Col>
-                            <Col xs={12}>
-                                <Accordion className="bb-acp-accordion">
-                                    <Accordion.Item eventKey="favicons">
-                                        <Accordion.Header>{t('acp.favicons')}</Accordion.Header>
-                                        <Accordion.Body>
-                                            <Row className="g-3">
-                                                <Col lg={4}>
-                                                    <Form.Group>
-                                                        <Form.Label>{t('acp.favicon_ico')}</Form.Label>
-                                                        <div {...faviconIcoDropzone.getRootProps({ className: 'bb-dropzone' })}>
-                                                            <input {...faviconIcoDropzone.getInputProps()} />
-                                                            {generalSettings.favicon_ico ? (
-                                                                <div className="bb-dropzone-preview">
-                                                                    <img src={generalSettings.favicon_ico} alt={t('acp.favicon_ico')} />
-                                                                </div>
-                                                            ) : (
-                                                                <div className="bb-dropzone-placeholder">
-                                                                    <i className="bi bi-upload" aria-hidden="true" />
-                                                                    <span>{t('acp.logo_upload')}</span>
-                                                                </div>
-                                                            )}
-                                                        </div>
-                                                    </Form.Group>
-                                                </Col>
-                                                <Col lg={4}>
-                                                    <Form.Group>
-                                                        <Form.Label>{t('acp.favicon_16')}</Form.Label>
-                                                        <div {...favicon16Dropzone.getRootProps({ className: 'bb-dropzone' })}>
-                                                            <input {...favicon16Dropzone.getInputProps()} />
-                                                            {generalSettings.favicon_16 ? (
-                                                                <div className="bb-dropzone-preview">
-                                                                    <img src={generalSettings.favicon_16} alt={t('acp.favicon_16')} />
-                                                                </div>
-                                                            ) : (
-                                                                <div className="bb-dropzone-placeholder">
-                                                                    <i className="bi bi-upload" aria-hidden="true" />
-                                                                    <span>{t('acp.logo_upload')}</span>
-                                                                </div>
-                                                            )}
-                                                        </div>
-                                                    </Form.Group>
-                                                </Col>
-                                                <Col lg={4}>
-                                                    <Form.Group>
-                                                        <Form.Label>{t('acp.favicon_32')}</Form.Label>
-                                                        <div {...favicon32Dropzone.getRootProps({ className: 'bb-dropzone' })}>
-                                                            <input {...favicon32Dropzone.getInputProps()} />
-                                                            {generalSettings.favicon_32 ? (
-                                                                <div className="bb-dropzone-preview">
-                                                                    <img src={generalSettings.favicon_32} alt={t('acp.favicon_32')} />
-                                                                </div>
-                                                            ) : (
-                                                                <div className="bb-dropzone-placeholder">
-                                                                    <i className="bi bi-upload" aria-hidden="true" />
-                                                                    <span>{t('acp.logo_upload')}</span>
-                                                                </div>
-                                                            )}
-                                                        </div>
-                                                    </Form.Group>
-                                                </Col>
-                                                <Col lg={4}>
-                                                    <Form.Group>
-                                                        <Form.Label>{t('acp.favicon_48')}</Form.Label>
-                                                        <div {...favicon48Dropzone.getRootProps({ className: 'bb-dropzone' })}>
-                                                            <input {...favicon48Dropzone.getInputProps()} />
-                                                            {generalSettings.favicon_48 ? (
-                                                                <div className="bb-dropzone-preview">
-                                                                    <img src={generalSettings.favicon_48} alt={t('acp.favicon_48')} />
-                                                                </div>
-                                                            ) : (
-                                                                <div className="bb-dropzone-placeholder">
-                                                                    <i className="bi bi-upload" aria-hidden="true" />
-                                                                    <span>{t('acp.logo_upload')}</span>
-                                                                </div>
-                                                            )}
-                                                        </div>
-                                                    </Form.Group>
-                                                </Col>
-                                                <Col lg={4}>
-                                                    <Form.Group>
-                                                        <Form.Label>{t('acp.favicon_64')}</Form.Label>
-                                                        <div {...favicon64Dropzone.getRootProps({ className: 'bb-dropzone' })}>
-                                                            <input {...favicon64Dropzone.getInputProps()} />
-                                                            {generalSettings.favicon_64 ? (
-                                                                <div className="bb-dropzone-preview">
-                                                                    <img src={generalSettings.favicon_64} alt={t('acp.favicon_64')} />
-                                                                </div>
-                                                            ) : (
-                                                                <div className="bb-dropzone-placeholder">
-                                                                    <i className="bi bi-upload" aria-hidden="true" />
-                                                                    <span>{t('acp.logo_upload')}</span>
-                                                                </div>
-                                                            )}
-                                                        </div>
-                                                    </Form.Group>
-                                                </Col>
-                                                <Col lg={4}>
-                                                    <Form.Group>
-                                                        <Form.Label>{t('acp.favicon_128')}</Form.Label>
-                                                        <div {...favicon128Dropzone.getRootProps({ className: 'bb-dropzone' })}>
-                                                            <input {...favicon128Dropzone.getInputProps()} />
-                                                            {generalSettings.favicon_128 ? (
-                                                                <div className="bb-dropzone-preview">
-                                                                    <img src={generalSettings.favicon_128} alt={t('acp.favicon_128')} />
-                                                                </div>
-                                                            ) : (
-                                                                <div className="bb-dropzone-placeholder">
-                                                                    <i className="bi bi-upload" aria-hidden="true" />
-                                                                    <span>{t('acp.logo_upload')}</span>
-                                                                </div>
-                                                            )}
-                                                        </div>
-                                                    </Form.Group>
-                                                </Col>
-                                                <Col lg={4}>
-                                                    <Form.Group>
-                                                        <Form.Label>{t('acp.favicon_256')}</Form.Label>
-                                                        <div {...favicon256Dropzone.getRootProps({ className: 'bb-dropzone' })}>
-                                                            <input {...favicon256Dropzone.getInputProps()} />
-                                                            {generalSettings.favicon_256 ? (
-                                                                <div className="bb-dropzone-preview">
-                                                                    <img src={generalSettings.favicon_256} alt={t('acp.favicon_256')} />
-                                                                </div>
-                                                            ) : (
-                                                                <div className="bb-dropzone-placeholder">
-                                                                    <i className="bi bi-upload" aria-hidden="true" />
-                                                                    <span>{t('acp.logo_upload')}</span>
-                                                                </div>
-                                                            )}
-                                                        </div>
-                                                    </Form.Group>
-                                                </Col>
-                                            </Row>
-                                        </Accordion.Body>
-                                    </Accordion.Item>
-                                </Accordion>
-                            </Col>
-                            <Col xs={12} className="d-flex justify-content-end">
-                                <Button
-                                    type="submit"
-                                    className="bb-accent-button"
-                                    disabled={generalSaving || generalUploading}
-                                >
-                                    {generalSaving ? t('form.saving') : t('acp.save')}
-                                </Button>
-                            </Col>
-                        </Row>
-                    </Form>
+                                </div>
+                            </div>
+                        </Col>
+                        <Col lg={9} xl={10}>
+                            <div className="bb-acp-panel mb-4">
+                                <div className="bb-acp-panel-header">
+                                    <h5 className="mb-1">{t('acp.welcome_title')}</h5>
+                                    <p className="bb-muted mb-0">{t('acp.general_hint')}</p>
+                                </div>
+                            </div>
+                            {generalError && <p className="text-danger">{generalError}</p>}
+                            <div className="bb-acp-panel">
+                                <div className="bb-acp-panel-header">
+                                    <h5 className="mb-0">{t('acp.general_settings')}</h5>
+                                </div>
+                                <div className="bb-acp-panel-body">
+                                    <Form onSubmit={handleGeneralSave} className="bb-acp-general">
+                                        <Row className="g-3">
+                                            <Col lg={6}>
+                                                <Form.Group>
+                                                    <Form.Label>{t('acp.forum_name')}</Form.Label>
+                                                    <Form.Control
+                                                        type="text"
+                                                        value={generalSettings.forum_name}
+                                                        onChange={(event) =>
+                                                            setGeneralSettings((prev) => ({
+                                                                ...prev,
+                                                                forum_name: event.target.value,
+                                                            }))
+                                                        }
+                                                    />
+                                                </Form.Group>
+                                                <Form.Group className="mt-2">
+                                                    <Form.Check
+                                                        type="checkbox"
+                                                        id="acp-show-header-name"
+                                                        label={t('acp.show_header_name')}
+                                                        checked={generalSettings.show_header_name !== 'false'}
+                                                        onChange={(event) =>
+                                                            setGeneralSettings((prev) => ({
+                                                                ...prev,
+                                                                show_header_name: event.target.checked ? 'true' : 'false',
+                                                            }))
+                                                        }
+                                                    />
+                                                </Form.Group>
+                                            </Col>
+                                            <Col lg={6}>
+                                                <Form.Group>
+                                                    <Form.Label>{t('acp.default_theme')}</Form.Label>
+                                                    <Form.Select
+                                                        value={generalSettings.default_theme}
+                                                        onChange={(event) => handleDefaultThemeChange(event.target.value)}
+                                                    >
+                                                        <option value="auto">{t('ucp.system_default')}</option>
+                                                        <option value="dark">{t('nav.theme_dark')}</option>
+                                                        <option value="light">{t('nav.theme_light')}</option>
+                                                    </Form.Select>
+                                                </Form.Group>
+                                            </Col>
+                                            <Col lg={6}>
+                                                <Form.Group>
+                                                    <Form.Label>{t('acp.accent_dark')}</Form.Label>
+                                                    <div className="d-flex align-items-center gap-2">
+                                                        <Form.Control
+                                                            type="text"
+                                                            value={generalSettings.accent_color_dark}
+                                                            onChange={(event) =>
+                                                                setGeneralSettings((prev) => ({
+                                                                    ...prev,
+                                                                    accent_color_dark: event.target.value,
+                                                                }))
+                                                            }
+                                                            placeholder="#f29b3f"
+                                                        />
+                                                        <Form.Control
+                                                            type="color"
+                                                            value={generalSettings.accent_color_dark || '#f29b3f'}
+                                                            onChange={(event) =>
+                                                                setGeneralSettings((prev) => ({
+                                                                    ...prev,
+                                                                    accent_color_dark: event.target.value,
+                                                                }))
+                                                            }
+                                                        />
+                                                    </div>
+                                                </Form.Group>
+                                            </Col>
+                                            <Col lg={6}>
+                                                <Form.Group>
+                                                    <Form.Label>{t('acp.accent_light')}</Form.Label>
+                                                    <div className="d-flex align-items-center gap-2">
+                                                        <Form.Control
+                                                            type="text"
+                                                            value={generalSettings.accent_color_light}
+                                                            onChange={(event) =>
+                                                                setGeneralSettings((prev) => ({
+                                                                    ...prev,
+                                                                    accent_color_light: event.target.value,
+                                                                }))
+                                                            }
+                                                            placeholder="#f29b3f"
+                                                        />
+                                                        <Form.Control
+                                                            type="color"
+                                                            value={generalSettings.accent_color_light || '#f29b3f'}
+                                                            onChange={(event) =>
+                                                                setGeneralSettings((prev) => ({
+                                                                    ...prev,
+                                                                    accent_color_light: event.target.value,
+                                                                }))
+                                                            }
+                                                        />
+                                                    </div>
+                                                </Form.Group>
+                                            </Col>
+                                            <Col lg={6}>
+                                                <Form.Group>
+                                                    <Form.Label>{t('acp.logo_dark')}</Form.Label>
+                                                    <div
+                                                        {...darkLogoDropzone.getRootProps({
+                                                            className: 'bb-dropzone',
+                                                        })}
+                                                    >
+                                                        <input {...darkLogoDropzone.getInputProps()} />
+                                                        {generalSettings.logo_dark ? (
+                                                            <div className="bb-dropzone-preview">
+                                                                <img src={generalSettings.logo_dark} alt={t('acp.logo_dark')} />
+                                                            </div>
+                                                        ) : (
+                                                            <div className="bb-dropzone-placeholder">
+                                                                <i className="bi bi-upload" aria-hidden="true" />
+                                                                <span>{t('acp.logo_upload')}</span>
+                                                            </div>
+                                                        )}
+                                                    </div>
+                                                </Form.Group>
+                                            </Col>
+                                            <Col lg={6}>
+                                                <Form.Group>
+                                                    <Form.Label>{t('acp.logo_light')}</Form.Label>
+                                                    <div
+                                                        {...lightLogoDropzone.getRootProps({
+                                                            className: 'bb-dropzone',
+                                                        })}
+                                                    >
+                                                        <input {...lightLogoDropzone.getInputProps()} />
+                                                        {generalSettings.logo_light ? (
+                                                            <div className="bb-dropzone-preview">
+                                                                <img src={generalSettings.logo_light} alt={t('acp.logo_light')} />
+                                                            </div>
+                                                        ) : (
+                                                            <div className="bb-dropzone-placeholder">
+                                                                <i className="bi bi-upload" aria-hidden="true" />
+                                                                <span>{t('acp.logo_upload')}</span>
+                                                            </div>
+                                                        )}
+                                                    </div>
+                                                </Form.Group>
+                                            </Col>
+                                            <Col xs={12}>
+                                                <Accordion className="bb-acp-accordion">
+                                                    <Accordion.Item eventKey="favicons">
+                                                        <Accordion.Header>{t('acp.favicons')}</Accordion.Header>
+                                                        <Accordion.Body>
+                                                            <Row className="g-3">
+                                                                <Col lg={4}>
+                                                                    <Form.Group>
+                                                                        <Form.Label>{t('acp.favicon_ico')}</Form.Label>
+                                                                        <div {...faviconIcoDropzone.getRootProps({ className: 'bb-dropzone' })}>
+                                                                            <input {...faviconIcoDropzone.getInputProps()} />
+                                                                            {generalSettings.favicon_ico ? (
+                                                                                <div className="bb-dropzone-preview">
+                                                                                    <img src={generalSettings.favicon_ico} alt={t('acp.favicon_ico')} />
+                                                                                </div>
+                                                                            ) : (
+                                                                                <div className="bb-dropzone-placeholder">
+                                                                                    <i className="bi bi-upload" aria-hidden="true" />
+                                                                                    <span>{t('acp.logo_upload')}</span>
+                                                                                </div>
+                                                                            )}
+                                                                        </div>
+                                                                    </Form.Group>
+                                                                </Col>
+                                                                <Col lg={4}>
+                                                                    <Form.Group>
+                                                                        <Form.Label>{t('acp.favicon_16')}</Form.Label>
+                                                                        <div {...favicon16Dropzone.getRootProps({ className: 'bb-dropzone' })}>
+                                                                            <input {...favicon16Dropzone.getInputProps()} />
+                                                                            {generalSettings.favicon_16 ? (
+                                                                                <div className="bb-dropzone-preview">
+                                                                                    <img src={generalSettings.favicon_16} alt={t('acp.favicon_16')} />
+                                                                                </div>
+                                                                            ) : (
+                                                                                <div className="bb-dropzone-placeholder">
+                                                                                    <i className="bi bi-upload" aria-hidden="true" />
+                                                                                    <span>{t('acp.logo_upload')}</span>
+                                                                                </div>
+                                                                            )}
+                                                                        </div>
+                                                                    </Form.Group>
+                                                                </Col>
+                                                                <Col lg={4}>
+                                                                    <Form.Group>
+                                                                        <Form.Label>{t('acp.favicon_32')}</Form.Label>
+                                                                        <div {...favicon32Dropzone.getRootProps({ className: 'bb-dropzone' })}>
+                                                                            <input {...favicon32Dropzone.getInputProps()} />
+                                                                            {generalSettings.favicon_32 ? (
+                                                                                <div className="bb-dropzone-preview">
+                                                                                    <img src={generalSettings.favicon_32} alt={t('acp.favicon_32')} />
+                                                                                </div>
+                                                                            ) : (
+                                                                                <div className="bb-dropzone-placeholder">
+                                                                                    <i className="bi bi-upload" aria-hidden="true" />
+                                                                                    <span>{t('acp.logo_upload')}</span>
+                                                                                </div>
+                                                                            )}
+                                                                        </div>
+                                                                    </Form.Group>
+                                                                </Col>
+                                                                <Col lg={4}>
+                                                                    <Form.Group>
+                                                                        <Form.Label>{t('acp.favicon_48')}</Form.Label>
+                                                                        <div {...favicon48Dropzone.getRootProps({ className: 'bb-dropzone' })}>
+                                                                            <input {...favicon48Dropzone.getInputProps()} />
+                                                                            {generalSettings.favicon_48 ? (
+                                                                                <div className="bb-dropzone-preview">
+                                                                                    <img src={generalSettings.favicon_48} alt={t('acp.favicon_48')} />
+                                                                                </div>
+                                                                            ) : (
+                                                                                <div className="bb-dropzone-placeholder">
+                                                                                    <i className="bi bi-upload" aria-hidden="true" />
+                                                                                    <span>{t('acp.logo_upload')}</span>
+                                                                                </div>
+                                                                            )}
+                                                                        </div>
+                                                                    </Form.Group>
+                                                                </Col>
+                                                                <Col lg={4}>
+                                                                    <Form.Group>
+                                                                        <Form.Label>{t('acp.favicon_64')}</Form.Label>
+                                                                        <div {...favicon64Dropzone.getRootProps({ className: 'bb-dropzone' })}>
+                                                                            <input {...favicon64Dropzone.getInputProps()} />
+                                                                            {generalSettings.favicon_64 ? (
+                                                                                <div className="bb-dropzone-preview">
+                                                                                    <img src={generalSettings.favicon_64} alt={t('acp.favicon_64')} />
+                                                                                </div>
+                                                                            ) : (
+                                                                                <div className="bb-dropzone-placeholder">
+                                                                                    <i className="bi bi-upload" aria-hidden="true" />
+                                                                                    <span>{t('acp.logo_upload')}</span>
+                                                                                </div>
+                                                                            )}
+                                                                        </div>
+                                                                    </Form.Group>
+                                                                </Col>
+                                                                <Col lg={4}>
+                                                                    <Form.Group>
+                                                                        <Form.Label>{t('acp.favicon_128')}</Form.Label>
+                                                                        <div {...favicon128Dropzone.getRootProps({ className: 'bb-dropzone' })}>
+                                                                            <input {...favicon128Dropzone.getInputProps()} />
+                                                                            {generalSettings.favicon_128 ? (
+                                                                                <div className="bb-dropzone-preview">
+                                                                                    <img src={generalSettings.favicon_128} alt={t('acp.favicon_128')} />
+                                                                                </div>
+                                                                            ) : (
+                                                                                <div className="bb-dropzone-placeholder">
+                                                                                    <i className="bi bi-upload" aria-hidden="true" />
+                                                                                    <span>{t('acp.logo_upload')}</span>
+                                                                                </div>
+                                                                            )}
+                                                                        </div>
+                                                                    </Form.Group>
+                                                                </Col>
+                                                                <Col lg={4}>
+                                                                    <Form.Group>
+                                                                        <Form.Label>{t('acp.favicon_256')}</Form.Label>
+                                                                        <div {...favicon256Dropzone.getRootProps({ className: 'bb-dropzone' })}>
+                                                                            <input {...favicon256Dropzone.getInputProps()} />
+                                                                            {generalSettings.favicon_256 ? (
+                                                                                <div className="bb-dropzone-preview">
+                                                                                    <img src={generalSettings.favicon_256} alt={t('acp.favicon_256')} />
+                                                                                </div>
+                                                                            ) : (
+                                                                                <div className="bb-dropzone-placeholder">
+                                                                                    <i className="bi bi-upload" aria-hidden="true" />
+                                                                                    <span>{t('acp.logo_upload')}</span>
+                                                                                </div>
+                                                                            )}
+                                                                        </div>
+                                                                    </Form.Group>
+                                                                </Col>
+                                                            </Row>
+                                                        </Accordion.Body>
+                                                    </Accordion.Item>
+                                                </Accordion>
+                                            </Col>
+                                            <Col xs={12} className="d-flex justify-content-end">
+                                                <Button
+                                                    type="submit"
+                                                    className="bb-accent-button"
+                                                    disabled={generalSaving || generalUploading}
+                                                >
+                                                    {generalSaving ? t('form.saving') : t('acp.save')}
+                                                </Button>
+                                            </Col>
+                                        </Row>
+                                    </Form>
+                                </div>
+                            </div>
+                        </Col>
+                    </Row>
                 </Tab>
                 <Tab eventKey="forums" title={t('acp.forums')}>
                     <p className="bb-muted">{t('acp.forums_hint')}</p>
@@ -2702,6 +2830,95 @@ export default function Acp({ isAdmin }) {
                     {attachmentGroupsError && <p className="text-danger">{attachmentGroupsError}</p>}
                     {attachmentExtensionsError && <p className="text-danger">{attachmentExtensionsError}</p>}
                     <div className="bb-attachment-admin">
+                        <div className="bb-attachment-admin-section">
+                            <div className="d-flex justify-content-between align-items-center mb-3">
+                                <h5 className="mb-0">{t('attachment.settings_title')}</h5>
+                            </div>
+                            <Form onSubmit={handleAttachmentSettingsSave}>
+                                <div className="row g-3 align-items-end">
+                                    <div className="col-12 col-md-6">
+                                        <Form.Check
+                                            type="switch"
+                                            id="attachment-display-inline"
+                                            label={t('attachment.display_images_inline')}
+                                            checked={attachmentSettings.display_images_inline !== 'false'}
+                                            onChange={(event) =>
+                                                setAttachmentSettings((prev) => ({
+                                                    ...prev,
+                                                    display_images_inline: event.target.checked ? 'true' : 'false',
+                                                }))
+                                            }
+                                        />
+                                    </div>
+                                    <div className="col-12 col-md-6">
+                                        <Form.Check
+                                            type="switch"
+                                            id="attachment-create-thumbnails"
+                                            label={t('attachment.create_thumbnails')}
+                                            checked={attachmentSettings.create_thumbnails !== 'false'}
+                                            onChange={(event) =>
+                                                setAttachmentSettings((prev) => ({
+                                                    ...prev,
+                                                    create_thumbnails: event.target.checked ? 'true' : 'false',
+                                                }))
+                                            }
+                                        />
+                                    </div>
+                                    <div className="col-12 col-md-4">
+                                        <Form.Label>{t('attachment.thumbnail_max_width')}</Form.Label>
+                                        <Form.Control
+                                            type="number"
+                                            min="0"
+                                            value={attachmentSettings.thumbnail_max_width}
+                                            onChange={(event) =>
+                                                setAttachmentSettings((prev) => ({
+                                                    ...prev,
+                                                    thumbnail_max_width: event.target.value,
+                                                }))
+                                            }
+                                        />
+                                    </div>
+                                    <div className="col-12 col-md-4">
+                                        <Form.Label>{t('attachment.thumbnail_max_height')}</Form.Label>
+                                        <Form.Control
+                                            type="number"
+                                            min="0"
+                                            value={attachmentSettings.thumbnail_max_height}
+                                            onChange={(event) =>
+                                                setAttachmentSettings((prev) => ({
+                                                    ...prev,
+                                                    thumbnail_max_height: event.target.value,
+                                                }))
+                                            }
+                                        />
+                                    </div>
+                                    <div className="col-12 col-md-4">
+                                        <Form.Label>{t('attachment.thumbnail_quality')}</Form.Label>
+                                        <Form.Control
+                                            type="number"
+                                            min="10"
+                                            max="95"
+                                            value={attachmentSettings.thumbnail_quality}
+                                            onChange={(event) =>
+                                                setAttachmentSettings((prev) => ({
+                                                    ...prev,
+                                                    thumbnail_quality: event.target.value,
+                                                }))
+                                            }
+                                        />
+                                    </div>
+                                </div>
+                                <div className="mt-3">
+                                    <Button
+                                        type="submit"
+                                        className="bb-accent-button"
+                                        disabled={attachmentSettingsSaving}
+                                    >
+                                        {attachmentSettingsSaving ? t('form.saving') : t('acp.save')}
+                                    </Button>
+                                </div>
+                            </Form>
+                        </div>
                         <div className="bb-attachment-admin-section">
                             <div className="d-flex justify-content-between align-items-center mb-3">
                                 <h5 className="mb-0">{t('attachment.groups_title')}</h5>
diff --git a/resources/js/pages/ThreadView.jsx b/resources/js/pages/ThreadView.jsx
index 3f91cb5..daa3b09 100644
--- a/resources/js/pages/ThreadView.jsx
+++ b/resources/js/pages/ThreadView.jsx
@@ -34,6 +34,7 @@ export default function ThreadView() {
     const [previewHtml, setPreviewHtml] = useState('')
     const [previewLoading, setPreviewLoading] = useState(false)
     const [previewUrls, setPreviewUrls] = useState([])
+    const [lightboxImage, setLightboxImage] = useState('')
     const [replyAttachmentTab, setReplyAttachmentTab] = useState('options')
     const [replyAttachmentOptions, setReplyAttachmentOptions] = useState({
         disableBbcode: false,
@@ -452,19 +453,40 @@ export default function ThreadView() {
         return (
             <div className="bb-attachment-list">
                 {attachments.map((attachment) => (
-                    <a
-                        key={attachment.id}
-                        href={attachment.download_url}
-                        className="bb-attachment-item"
-                        download
-                    >
-                        <i className="bi bi-paperclip" aria-hidden="true" />
-                        <span className="bb-attachment-name">{attachment.original_name}</span>
-                        <span className="bb-attachment-meta">
-                            {attachment.mime_type}
-                            {attachment.size_bytes ? ` · ${formatBytes(attachment.size_bytes)}` : ''}
-                        </span>
-                    </a>
+                    attachment.is_image ? (
+                        <button
+                            key={attachment.id}
+                            type="button"
+                            className="bb-attachment-item border-0 text-start"
+                            onClick={() => setLightboxImage(attachment.download_url)}
+                        >
+                            <img
+                                src={attachment.thumbnail_url || attachment.download_url}
+                                alt={attachment.original_name}
+                                className="img-fluid rounded"
+                                style={{ width: 72, height: 72, objectFit: 'cover' }}
+                            />
+                            <span className="bb-attachment-name">{attachment.original_name}</span>
+                            <span className="bb-attachment-meta">
+                                {attachment.mime_type}
+                                {attachment.size_bytes ? ` · ${formatBytes(attachment.size_bytes)}` : ''}
+                            </span>
+                        </button>
+                    ) : (
+                        <a
+                            key={attachment.id}
+                            href={attachment.download_url}
+                            className="bb-attachment-item"
+                            download
+                        >
+                            <i className="bi bi-paperclip" aria-hidden="true" />
+                            <span className="bb-attachment-name">{attachment.original_name}</span>
+                            <span className="bb-attachment-meta">
+                                {attachment.mime_type}
+                                {attachment.size_bytes ? ` · ${formatBytes(attachment.size_bytes)}` : ''}
+                            </span>
+                        </a>
+                    )
                 ))}
             </div>
         )
@@ -727,6 +749,12 @@ export default function ThreadView() {
                                         </div>
                                         <div
                                             className="bb-post-body"
+                                            onClick={(event) => {
+                                                if (event.target?.tagName === 'IMG') {
+                                                    event.preventDefault()
+                                                    setLightboxImage(event.target.src)
+                                                }
+                                            }}
                                             dangerouslySetInnerHTML={{ __html: post.body_html || post.body }}
                                         />
                                         {renderAttachments(post.attachments)}
@@ -852,6 +880,18 @@ export default function ThreadView() {
                     />
                 </Modal.Body>
             </Modal>
+            <Modal
+                show={Boolean(lightboxImage)}
+                onHide={() => setLightboxImage('')}
+                centered
+                size="lg"
+            >
+                <Modal.Body className="text-center">
+                    {lightboxImage && (
+                        <img src={lightboxImage} alt="" className="img-fluid rounded" />
+                    )}
+                </Modal.Body>
+            </Modal>
         </Container>
     )
 }
diff --git a/resources/lang/de.json b/resources/lang/de.json
index 714a26b..89c445c 100644
--- a/resources/lang/de.json
+++ b/resources/lang/de.json
@@ -51,6 +51,16 @@
   "acp.forums_tree": "Forenbaum",
   "acp.forums_type": "Typ",
   "acp.general": "Allgemein",
+  "acp.quick_access": "Schnellzugriff",
+  "acp.board_configuration": "Board-Konfiguration",
+  "acp.client_communication": "Client-Kommunikation",
+  "acp.server_configuration": "Server-Konfiguration",
+  "acp.authentication": "Authentifizierung",
+  "acp.email_settings": "E-Mail-Einstellungen",
+  "acp.security_settings": "Sicherheitseinstellungen",
+  "acp.search_settings": "Sucheinstellungen",
+  "acp.welcome_title": "Willkommen bei speedBB",
+  "acp.general_settings": "Allgemeine Einstellungen",
   "acp.general_hint": "Globale Einstellungen und Board-Konfiguration erscheinen hier.",
   "acp.loading": "Laden...",
   "acp.new_category": "Neue Kategorie",
@@ -217,6 +227,12 @@
   "ucp.accent_override_hint": "Wähle eine eigene Akzentfarbe für die Oberfläche.",
   "ucp.custom_color": "Eigene Farbe",
   "attachment.groups_title": "Anhanggruppen",
+  "attachment.settings_title": "Anhang-Einstellungen",
+  "attachment.display_images_inline": "Bilder inline anzeigen",
+  "attachment.create_thumbnails": "Vorschaubilder erstellen",
+  "attachment.thumbnail_max_width": "Maximale Vorschaubreite (px)",
+  "attachment.thumbnail_max_height": "Maximale Vorschaubildhöhe (px)",
+  "attachment.thumbnail_quality": "Vorschaubild-Qualität (JPEG/WebP)",
   "attachment.group_create": "Neue Anhanggruppe",
   "attachment.group_create_title": "Anhanggruppe erstellen",
   "attachment.group_edit_title": "Anhanggruppe bearbeiten",
diff --git a/resources/lang/en.json b/resources/lang/en.json
index 1b412f3..1cce9cc 100644
--- a/resources/lang/en.json
+++ b/resources/lang/en.json
@@ -51,6 +51,16 @@
   "acp.forums_tree": "Forum tree",
   "acp.forums_type": "Type",
   "acp.general": "General",
+  "acp.quick_access": "Quick access",
+  "acp.board_configuration": "Board configuration",
+  "acp.client_communication": "Client communication",
+  "acp.server_configuration": "Server configuration",
+  "acp.authentication": "Authentication",
+  "acp.email_settings": "Email settings",
+  "acp.security_settings": "Security settings",
+  "acp.search_settings": "Search settings",
+  "acp.welcome_title": "Welcome to speedBB",
+  "acp.general_settings": "General settings",
   "acp.general_hint": "Global settings and board configuration will appear here.",
   "acp.loading": "Loading...",
   "acp.new_category": "New category",
@@ -217,6 +227,12 @@
   "ucp.accent_override_hint": "Choose a custom accent color for your UI.",
   "ucp.custom_color": "Custom color",
   "attachment.groups_title": "Attachment groups",
+  "attachment.settings_title": "Attachment settings",
+  "attachment.display_images_inline": "Display images inline",
+  "attachment.create_thumbnails": "Create thumbnails",
+  "attachment.thumbnail_max_width": "Maximum thumbnail width (px)",
+  "attachment.thumbnail_max_height": "Maximum thumbnail height (px)",
+  "attachment.thumbnail_quality": "Thumbnail quality (JPEG/WebP)",
   "attachment.group_create": "New attachment group",
   "attachment.group_create_title": "Create attachment group",
   "attachment.group_edit_title": "Edit attachment group",
diff --git a/routes/api.php b/routes/api.php
index 51971c8..b0c34d8 100644
--- a/routes/api.php
+++ b/routes/api.php
@@ -77,6 +77,7 @@ Route::get('/attachments', [AttachmentController::class, 'index']);
 Route::post('/attachments', [AttachmentController::class, 'store'])->middleware('auth:sanctum');
 Route::get('/attachments/{attachment}', [AttachmentController::class, 'show']);
 Route::get('/attachments/{attachment}/download', [AttachmentController::class, 'download']);
+Route::get('/attachments/{attachment}/thumbnail', [AttachmentController::class, 'thumbnail']);
 Route::delete('/attachments/{attachment}', [AttachmentController::class, 'destroy'])->middleware('auth:sanctum');
 
 Route::get('/forums', [ForumController::class, 'index']);