diff --git a/app/Http/Controllers/Admin/CourseController.php b/app/Http/Controllers/Admin/CourseController.php
index d65412c..b2ef59f 100755
--- a/app/Http/Controllers/Admin/CourseController.php
+++ b/app/Http/Controllers/Admin/CourseController.php
@@ -64,11 +64,15 @@ class CourseController extends Controller
             'objectives' => 'nullable|string',
             'category_id' => 'nullable|exists:course_categories,id',
             'type' => 'required|in:standard,scorm,h5p',
-            'thumbnail' => 'nullable|image|max:2048',
+            'thumbnail' => 'nullable|image|mimes:jpeg,png,jpg,webp|max:2048|dimensions:min_width=400,min_height=300',
             'duration_minutes' => 'nullable|integer',
             'passing_score' => 'nullable|integer|min:0|max:100',
             'has_certificate' => 'boolean',
             'is_active' => 'boolean',
+        ], [
+            'thumbnail.dimensions' => 'Изображение должно быть не менее 400x300 пикселей. Ваш размер: :width x :height px',
+            'thumbnail.mimes' => 'Допустимые форматы: JPEG, PNG, WebP',
+            'thumbnail.max' => 'Максимальный размер файла: 2MB',
         ]);
         
         $validated['slug'] = $validated['slug'] ?? Str::slug($validated['title']);
@@ -114,11 +118,15 @@ class CourseController extends Controller
             'objectives' => 'nullable|string',
             'category_id' => 'nullable|exists:course_categories,id',
             'type' => 'required|in:standard,scorm,h5p',
-            'thumbnail' => 'nullable|image|max:2048',
+            'thumbnail' => 'nullable|image|mimes:jpeg,png,jpg,webp|max:2048|dimensions:min_width=400,min_height=300',
             'duration_minutes' => 'nullable|integer',
             'passing_score' => 'nullable|integer|min:0|max:100',
             'has_certificate' => 'boolean',
             'is_active' => 'boolean',
+        ], [
+            'thumbnail.dimensions' => 'Изображение должно быть не менее 400x300 пикселей. Ваш размер: :width x :height px',
+            'thumbnail.mimes' => 'Допустимые форматы: JPEG, PNG, WebP',
+            'thumbnail.max' => 'Максимальный размер файла: 2MB',
         ]);
         
         $validated['slug'] = $validated['slug'] ?? Str::slug($validated['title']);
diff --git a/resources/views/admin/courses/create.blade.php b/resources/views/admin/courses/create.blade.php
index ea8e05a..66134ce 100644
--- a/resources/views/admin/courses/create.blade.php
+++ b/resources/views/admin/courses/create.blade.php
@@ -75,6 +75,7 @@
                                 <div class="mb-3">
                                     <label class="form-label">Обложка</label>
                                     <input type="file" name="thumbnail" class="form-control" accept="image/*">
+                                    <small class="text-muted">Мин. 400x300px, макс. 2MB, форматы: JPEG, PNG, WebP</small>
                                 </div>
                             </div>
                         </div>
diff --git a/resources/views/admin/courses/edit.blade.php b/resources/views/admin/courses/edit.blade.php
index 8786d6a..dbb1ab8 100644
--- a/resources/views/admin/courses/edit.blade.php
+++ b/resources/views/admin/courses/edit.blade.php
@@ -72,7 +72,8 @@
                                 <div class="mb-3">
                                     <label class="form-label">Обложка</label>
                                     <input type="file" name="thumbnail" class="form-control" accept="image/*">
-                                    @if($course->thumbnail)<small class="text-muted">Текущая: {{ basename($course->thumbnail) }}</small>@endif
+                                    @if($course->thumbnail)<small class="text-muted d-block">Текущая: {{ basename($course->thumbnail) }}</small>@endif
+                                    <small class="text-muted">Мин. 400x300px, макс. 2MB, форматы: JPEG, PNG, WebP</small>
                                 </div>
                             </div>
                         </div>