diff --git a/lib/services/storage_service.dart b/lib/services/storage_service.dart
index 73c3707..8cafb98 100644
--- a/lib/services/storage_service.dart
+++ b/lib/services/storage_service.dart
@@ -113,6 +113,12 @@ class StorageService {
 
   static Future<Uint8List> _compressImage(File source) async {
     final bytes = await source.readAsBytes();
+    return compute(_compressImageBytes, bytes);
+  }
+
+  /// Performs CPU-intensive image decoding, resizing, and JPEG encoding.
+  /// Runs in a background isolate via [compute] to avoid blocking the UI thread.
+  static Uint8List _compressImageBytes(Uint8List bytes) {
     final decoded = img.decodeImage(bytes);
     if (decoded == null) {
       throw Exception('Invalid image file.');