diff --git a/android/app/src/main/AndroidManifest.xml b/android/app/src/main/AndroidManifest.xml
index c978fa184..7167c941c 100644
--- a/android/app/src/main/AndroidManifest.xml
+++ b/android/app/src/main/AndroidManifest.xml
@@ -80,6 +80,10 @@
         />
       </intent-filter>
     </activity>
+    <activity
+      android:name="com.yalantis.ucrop.UCropActivity"
+      android:screenOrientation="portrait"
+      android:theme="@style/Theme.AppCompat.Light.NoActionBar"/>
     <!-- Don't delete the meta-data below.
          This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
     <meta-data
diff --git a/lib/timetable/p13n/page/background.dart b/lib/timetable/p13n/page/background.dart
index dbc1faf73..a7e35c997 100644
--- a/lib/timetable/p13n/page/background.dart
+++ b/lib/timetable/p13n/page/background.dart
@@ -144,7 +144,7 @@ class _TimetableBackgroundEditorState extends ConsumerState<TimetableBackgroundE
                   FileImage(renderImageFile),
                 );
                 if (added) {
-                if (!context.mounted) return;
+                  if (!context.mounted) return;
                   context.push("/timetable/palettes/custom");
                 }
               },
@@ -261,7 +261,13 @@ class _TimetableBackgroundEditorState extends ConsumerState<TimetableBackgroundE
     );
     if (fi == null) return;
     if (!mounted) return;
-    final file = File(fi.path);
+    var file = File(fi.path);
+    if (Platform.isAndroid || Platform.isIOS) {
+      final croppedFile = await cropImage(context, file);
+      if (croppedFile != null) {
+        file = croppedFile;
+      }
+    }
     setState(() {
       rawPath = fi.path;
       renderImageFile = file;
diff --git a/lib/utils/images.dart b/lib/utils/images.dart
index f258c2bbf..7d1060ece 100644
--- a/lib/utils/images.dart
+++ b/lib/utils/images.dart
@@ -1,6 +1,8 @@
 import 'dart:io';
 
+import 'package:flutter/material.dart';
 import 'package:flutter_image_compress/flutter_image_compress.dart';
+import 'package:image_cropper/image_cropper.dart';
 import 'package:universal_platform/universal_platform.dart';
 import 'package:path/path.dart' as path;
 
@@ -28,3 +30,25 @@ Future<void> copyCompressedImageToTarget({
     await source.copy(target);
   }
 }
+
+Future<File?> cropImage(BuildContext context, File imageFile) async {
+  final croppedFile = await ImageCropper().cropImage(
+    sourcePath: imageFile.path,
+    uiSettings: [
+      AndroidUiSettings(
+        aspectRatioPresets: [
+          CropAspectRatioPreset.original,
+          CropAspectRatioPreset.square,
+        ],
+      ),
+      IOSUiSettings(
+        aspectRatioPresets: [
+          CropAspectRatioPreset.original,
+          CropAspectRatioPreset.square,
+        ],
+      ),
+    ],
+  );
+  if (croppedFile == null) return null;
+  return File(croppedFile.path);
+}
diff --git a/pubspec.lock b/pubspec.lock
index daa962ca5..fc0b75975 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -1234,6 +1234,30 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "4.2.0"
+  image_cropper:
+    dependency: "direct main"
+    description:
+      name: image_cropper
+      sha256: fe37d9a129411486e0d93089b61bd326d05b89e78ad4981de54b560725bf5bd5
+      url: "https://pub.dev"
+    source: hosted
+    version: "8.0.2"
+  image_cropper_for_web:
+    dependency: transitive
+    description:
+      name: image_cropper_for_web
+      sha256: "34256c8fb7fcb233251787c876bb37271744459b593a948a2db73caa323034d0"
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.0.2"
+  image_cropper_platform_interface:
+    dependency: transitive
+    description:
+      name: image_cropper_platform_interface
+      sha256: e8e9d2ca36360387aee39295ce49029362ae4df3071f23e8e71f2b81e40b7531
+      url: "https://pub.dev"
+    source: hosted
+    version: "7.0.0"
   image_picker:
     dependency: "direct main"
     description:
diff --git a/pubspec.yaml b/pubspec.yaml
index d40c9102b..4ae9c9f3a 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -163,7 +163,7 @@ dependencies:
   super_context_menu: ^0.8.22
   animated_size_and_fade: ^4.0.0
   dismissible_page: ^1.0.2
-
+  image_cropper: ^8.0.2
   # Utils
   # dart.io.Platform API for Web
   universal_platform: ^1.1.0
diff --git a/web/index.html b/web/index.html
index 8ea3013cd..1b657e7fb 100644
--- a/web/index.html
+++ b/web/index.html
@@ -46,6 +46,9 @@
   <!-- This script adds the flutter initialization JS code -->
   <script src="flutter.js" defer></script>
   <script type="application/javascript" src="/assets/packages/flutter_inappwebview_web/assets/web/web_support.js" defer></script>
+  <!-- cropperjs -->
+  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/cropperjs/1.6.2/cropper.css" />
+  <script src="https://cdnjs.cloudflare.com/ajax/libs/cropperjs/1.6.2/cropper.min.js"></script>
 </head>
 </head>
 <body>