diff --git a/app/Http/Controllers/ServiceImageController.php b/app/Http/Controllers/ServiceImageController.php
new file mode 100644
index 0000000..481fa58
--- /dev/null
+++ b/app/Http/Controllers/ServiceImageController.php
@@ -0,0 +1,48 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Models\Service;
+use App\Models\Setting;
+use App\Services\FileConversionService;
+use Illuminate\Http\RedirectResponse;
+use Illuminate\Http\Request;
+use Illuminate\Validation\Rule;
+
+class ServiceImageController extends Controller
+{
+    public function storeKeyVisual(Request $request, Service $service): RedirectResponse
+    {
+        return $this->store($request, $service, 'key_visual_filename', 'current_key_visual');
+    }
+
+    public function storeBackground(Request $request, Service $service): RedirectResponse
+    {
+        return $this->store($request, $service, 'background_filename', 'current_background');
+    }
+
+    private function store(Request $request, Service $service, string $column, string $settingKey): RedirectResponse
+    {
+        $request->validate([
+            'file' => ['required', 'file', 'mimes:jpg,jpeg,png', 'max:20480'],
+            'scope' => ['required', Rule::in(['service', 'default'])],
+        ], [
+            'file.required' => 'Bitte wähle eine Bilddatei aus.',
+            'file.file' => 'Die hochgeladene Datei ist ungültig.',
+            'file.mimes' => 'Nur Bilddateien (jpg, png) sind erlaubt.',
+            'file.max' => 'Die Datei darf maximal 20 MB groß sein.',
+            'scope.required' => 'Bitte wähle einen Geltungsbereich.',
+            'scope.in' => 'Der gewählte Geltungsbereich ist ungültig.',
+        ]);
+
+        $result = app(FileConversionService::class)->convertImageCover($request->file('file'));
+
+        $service->update([$column => $result['filename']]);
+
+        if ($request->input('scope') === 'default') {
+            Setting::set($settingKey, $result['filename']);
+        }
+
+        return back()->with('success', 'Bild wurde gespeichert.');
+    }
+}
diff --git a/routes/web.php b/routes/web.php
index 8c7dff1..876eb8b 100644
--- a/routes/web.php
+++ b/routes/web.php
@@ -8,6 +8,7 @@
 use App\Http\Controllers\MacroAssignmentController;
 use App\Http\Controllers\MacroImportController;
 use App\Http\Controllers\ServiceController;
+use App\Http\Controllers\ServiceImageController;
 use App\Http\Controllers\ServiceMacroOverrideController;
 use App\Http\Controllers\SettingsController;
 use App\Http\Controllers\SongPdfController;
@@ -67,6 +68,8 @@
     Route::get('/services/{service}/download-bundle/{blockType}', [ServiceController::class, 'downloadBundle'])->name('services.download-bundle');
     Route::get('/services/{service}/agenda-items/{agendaItem}/download', [ServiceController::class, 'downloadAgendaItem'])->name('services.agenda-item.download');
     Route::get('/services/{service}/edit', [ServiceController::class, 'edit'])->name('services.edit');
+    Route::post('/services/{service}/key-visual', [ServiceImageController::class, 'storeKeyVisual'])->name('services.key-visual.store');
+    Route::post('/services/{service}/background', [ServiceImageController::class, 'storeBackground'])->name('services.background.store');
     Route::get('/songs/{song}/translate', [TranslationController::class, 'page'])->name('songs.translate');
 
     Route::get('/songs', function () {
diff --git a/tests/Feature/ServiceImageControllerTest.php b/tests/Feature/ServiceImageControllerTest.php
new file mode 100644
index 0000000..953240d
--- /dev/null
+++ b/tests/Feature/ServiceImageControllerTest.php
@@ -0,0 +1,159 @@
+<?php
+
+use App\Models\Service;
+use App\Models\Setting;
+use App\Models\User;
+use Illuminate\Http\UploadedFile;
+use Illuminate\Support\Facades\Queue;
+use Illuminate\Support\Facades\Storage;
+
+beforeEach(function () {
+    Storage::fake('public');
+    Queue::fake();
+    $this->user = User::factory()->create();
+    $this->actingAs($this->user);
+    $this->service = Service::factory()->create();
+});
+
+/*
+|--------------------------------------------------------------------------
+| Key-Visual Upload
+|--------------------------------------------------------------------------
+*/
+
+test('key visual upload with service scope sets column only', function () {
+    $file = makeImageUpload('keyvisual.png', 800, 600);
+
+    $response = $this->post(route('services.key-visual.store', $this->service), [
+        'file' => $file,
+        'scope' => 'service',
+    ]);
+
+    $response->assertRedirect();
+    $response->assertSessionHas('success');
+
+    $this->service->refresh();
+    expect($this->service->key_visual_filename)->not->toBeNull();
+    expect($this->service->key_visual_filename)->toStartWith('slides/');
+    expect($this->service->key_visual_filename)->toEndWith('.jpg');
+    expect(Storage::disk('public')->exists($this->service->key_visual_filename))->toBeTrue();
+
+    expect(Setting::get('current_key_visual'))->toBeNull();
+});
+
+/*
+|--------------------------------------------------------------------------
+| Background Upload (default scope)
+|--------------------------------------------------------------------------
+*/
+
+test('background upload with default scope sets column and global setting', function () {
+    $file = makeImageUpload('background.png', 1920, 1080);
+
+    $response = $this->post(route('services.background.store', $this->service), [
+        'file' => $file,
+        'scope' => 'default',
+    ]);
+
+    $response->assertRedirect();
+    $response->assertSessionHas('success');
+
+    $this->service->refresh();
+    expect($this->service->background_filename)->not->toBeNull();
+    expect($this->service->background_filename)->toStartWith('slides/');
+    expect(Storage::disk('public')->exists($this->service->background_filename))->toBeTrue();
+
+    expect(Setting::get('current_background'))->toBe($this->service->background_filename);
+});
+
+/*
+|--------------------------------------------------------------------------
+| Validation
+|--------------------------------------------------------------------------
+*/
+
+test('key visual upload rejects non-image file with german error', function () {
+    $file = UploadedFile::fake()->create('notes.txt', 10, 'text/plain');
+
+    $response = $this->postJson(route('services.key-visual.store', $this->service), [
+        'file' => $file,
+        'scope' => 'service',
+    ]);
+
+    $response->assertStatus(422);
+    $response->assertJsonValidationErrors(['file']);
+    expect($response->json('errors.file.0'))->toContain('Bild');
+
+    $this->service->refresh();
+    expect($this->service->key_visual_filename)->toBeNull();
+});
+
+test('background upload rejects invalid scope', function () {
+    $file = makeImageUpload('background.png', 800, 600);
+
+    $response = $this->postJson(route('services.background.store', $this->service), [
+        'file' => $file,
+        'scope' => 'bogus',
+    ]);
+
+    $response->assertStatus(422);
+    $response->assertJsonValidationErrors(['scope']);
+});
+
+test('key visual upload does not delete previous file', function () {
+    $first = makeImageUpload('first.png', 800, 600);
+    $this->post(route('services.key-visual.store', $this->service), [
+        'file' => $first,
+        'scope' => 'service',
+    ]);
+    $this->service->refresh();
+    $oldFilename = $this->service->key_visual_filename;
+
+    $second = makeImageUpload('second.png', 800, 600);
+    $this->post(route('services.key-visual.store', $this->service), [
+        'file' => $second,
+        'scope' => 'service',
+    ]);
+    $this->service->refresh();
+
+    expect($this->service->key_visual_filename)->not->toBe($oldFilename);
+    expect(Storage::disk('public')->exists($oldFilename))->toBeTrue();
+});
+
+/*
+|--------------------------------------------------------------------------
+| Auth
+|--------------------------------------------------------------------------
+*/
+
+test('key visual upload requires authentication', function () {
+    auth()->logout();
+    $file = makeImageUpload('keyvisual.png', 800, 600);
+
+    $response = $this->post(route('services.key-visual.store', $this->service), [
+        'file' => $file,
+        'scope' => 'service',
+    ]);
+
+    $response->assertRedirect(route('login'));
+});
+
+function makeImageUpload(string $name = 'test.png', int $w = 800, int $h = 600): UploadedFile
+{
+    $path = tempnam(sys_get_temp_dir(), 'cts-svc-img-');
+    if ($path === false) {
+        throw new RuntimeException('Temp-Datei konnte nicht erstellt werden.');
+    }
+
+    $image = imagecreatetruecolor($w, $h);
+    if ($image === false) {
+        throw new RuntimeException('Bild konnte nicht erstellt werden.');
+    }
+
+    $blue = imagecolorallocate($image, 0, 0, 255);
+    imagefill($image, 0, 0, $blue);
+    imagepng($image, $path);
+    imagedestroy($image);
+
+    return new UploadedFile($path, $name, 'image/png', null, true);
+}