diff --git a/contact/pubspec.lock b/contact/pubspec.lock
index ded701d809..beb8865df5 100644
--- a/contact/pubspec.lock
+++ b/contact/pubspec.lock
@@ -337,10 +337,10 @@ packages:
     dependency: transitive
     description:
       name: flutter_charset_detector
-      sha256: "45de8a4b4255c1ea850a30955e7456091899ed4ff8b75593e14ec59f629b4b56"
+      sha256: "5d4796d43dac2f37e14149b0f0c676fa08e8eb1ada8e99342a838d971d2fb9b1"
       url: "https://pub.dev"
     source: hosted
-    version: "2.0.0"
+    version: "3.0.0"
   flutter_charset_detector_android:
     dependency: transitive
     description:
@@ -349,14 +349,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.1"
-  flutter_charset_detector_ios:
+  flutter_charset_detector_darwin:
     dependency: transitive
     description:
-      name: flutter_charset_detector_ios
-      sha256: e0e2c7b819cd1f7c9a50da94bf7f0e6d7a095eb64e81196ec758e77793903d43
+      name: flutter_charset_detector_darwin
+      sha256: daac20390275efb92fbb14350fe11286c5e29c7b80d6b0867f52d760f0d69763
       url: "https://pub.dev"
     source: hosted
-    version: "1.0.2"
+    version: "1.1.0"
   flutter_charset_detector_platform_interface:
     dependency: transitive
     description:
@@ -365,6 +365,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.1.0"
+  flutter_charset_detector_web:
+    dependency: transitive
+    description:
+      name: flutter_charset_detector_web
+      sha256: d8495115abada771c75f9395aae3e5809ffd506e8fc8f62b403ae11fc29e1d2b
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.2"
   flutter_image_compress:
     dependency: transitive
     description:
diff --git a/core/lib/utils/file_utils.dart b/core/lib/utils/file_utils.dart
index 9cd2708203..19dc48a824 100644
--- a/core/lib/utils/file_utils.dart
+++ b/core/lib/utils/file_utils.dart
@@ -9,7 +9,7 @@ import 'package:flutter_charset_detector/flutter_charset_detector.dart';
 import 'package:path_provider/path_provider.dart';
 
 class FileUtils {
-  static const String DEFAULT_CHARSET = 'UTF-8';
+  static const String DEFAULT_CHARSET = 'uft-8';
   static const String TEXT_PLAIN_MIME_TYPE = 'text/plain';
 
   Future<String> _getInternalStorageDirPath({
@@ -139,14 +139,13 @@ class FileUtils {
     }
   }
 
-  Future<String> getFileCharset(String filePath) async {
+  Future<String> getCharsetFromBytes(Uint8List bytes) async {
     try {
-      final file = File(filePath);
-      final decodingResult = await CharsetDetector.autoDecode(file.readAsBytesSync());
-      logError('FileUtils::getFileCharset: FILE_CHARSET = ${decodingResult.charset}');
-      return decodingResult.charset;
+      final decodedResult = await CharsetDetector.autoDecode(bytes);
+      log('FileUtils::getCharsetFromBytes: FILE_CHARSET = ${decodedResult.charset}');
+      return decodedResult.charset;
     } catch (e) {
-      logError('FileUtils::getFileCharset: Exception: $e');
+      logError('FileUtils::getCharsetFromBytes: Exception: $e');
       return DEFAULT_CHARSET;
     }
   }
diff --git a/core/lib/utils/web_renderer/canvas_kit_web.dart b/core/lib/utils/web_renderer/canvas_kit_web.dart
index 94317ab2db..fd03937e5b 100644
--- a/core/lib/utils/web_renderer/canvas_kit_web.dart
+++ b/core/lib/utils/web_renderer/canvas_kit_web.dart
@@ -1,4 +1,4 @@
-import 'dart:js' as js;
+import 'package:universal_html/js.dart' as js;
 
 /// Whether the CanvasKit renderer is being used on web.
 ///
diff --git a/core/pubspec.lock b/core/pubspec.lock
index 445594eb95..00d679e4ab 100644
--- a/core/pubspec.lock
+++ b/core/pubspec.lock
@@ -330,10 +330,10 @@ packages:
     dependency: "direct main"
     description:
       name: flutter_charset_detector
-      sha256: "45de8a4b4255c1ea850a30955e7456091899ed4ff8b75593e14ec59f629b4b56"
+      sha256: "5d4796d43dac2f37e14149b0f0c676fa08e8eb1ada8e99342a838d971d2fb9b1"
       url: "https://pub.dev"
     source: hosted
-    version: "2.0.0"
+    version: "3.0.0"
   flutter_charset_detector_android:
     dependency: transitive
     description:
@@ -342,14 +342,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.0.1"
-  flutter_charset_detector_ios:
+  flutter_charset_detector_darwin:
     dependency: transitive
     description:
-      name: flutter_charset_detector_ios
-      sha256: e0e2c7b819cd1f7c9a50da94bf7f0e6d7a095eb64e81196ec758e77793903d43
+      name: flutter_charset_detector_darwin
+      sha256: d17c1847366a0501449d95d18a43417585841afe10200ceefb4422e6b7fccefb
       url: "https://pub.dev"
     source: hosted
-    version: "1.0.2"
+    version: "1.0.0"
   flutter_charset_detector_platform_interface:
     dependency: transitive
     description:
@@ -358,6 +358,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.0.0"
+  flutter_charset_detector_web:
+    dependency: transitive
+    description:
+      name: flutter_charset_detector_web
+      sha256: d8495115abada771c75f9395aae3e5809ffd506e8fc8f62b403ae11fc29e1d2b
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.2"
   flutter_image_compress:
     dependency: "direct main"
     description:
diff --git a/core/pubspec.yaml b/core/pubspec.yaml
index 4c59184b2f..0ebbc60a84 100644
--- a/core/pubspec.yaml
+++ b/core/pubspec.yaml
@@ -79,7 +79,7 @@ dependencies:
 
   fk_user_agent: 2.1.0
 
-  flutter_charset_detector: 2.0.0
+  flutter_charset_detector: 3.0.0
 
 dev_dependencies:
   flutter_test:
diff --git a/ios/Podfile.lock b/ios/Podfile.lock
index 304ba9ef93..d1d2b04611 100644
--- a/ios/Podfile.lock
+++ b/ios/Podfile.lock
@@ -90,8 +90,9 @@ PODS:
   - flutter_appauth (0.0.1):
     - AppAuth (= 1.7.4)
     - Flutter
-  - flutter_charset_detector_ios (0.0.1):
+  - flutter_charset_detector_darwin (0.0.1):
     - Flutter
+    - FlutterMacOS
     - UniversalDetector2 (= 2.0.1)
   - flutter_downloader (0.0.1):
     - Flutter
@@ -205,7 +206,7 @@ DEPENDENCIES:
   - fk_user_agent (from `.symlinks/plugins/fk_user_agent/ios`)
   - Flutter (from `Flutter`)
   - flutter_appauth (from `.symlinks/plugins/flutter_appauth/ios`)
-  - flutter_charset_detector_ios (from `.symlinks/plugins/flutter_charset_detector_ios/ios`)
+  - flutter_charset_detector_darwin (from `.symlinks/plugins/flutter_charset_detector_darwin/darwin`)
   - flutter_downloader (from `.symlinks/plugins/flutter_downloader/ios`)
   - flutter_image_compress_common (from `.symlinks/plugins/flutter_image_compress_common/ios`)
   - flutter_inappwebview_ios (from `.symlinks/plugins/flutter_inappwebview_ios/ios`)
@@ -273,8 +274,8 @@ EXTERNAL SOURCES:
     :path: Flutter
   flutter_appauth:
     :path: ".symlinks/plugins/flutter_appauth/ios"
-  flutter_charset_detector_ios:
-    :path: ".symlinks/plugins/flutter_charset_detector_ios/ios"
+  flutter_charset_detector_darwin:
+    :path: ".symlinks/plugins/flutter_charset_detector_darwin/darwin"
   flutter_downloader:
     :path: ".symlinks/plugins/flutter_downloader/ios"
   flutter_image_compress_common:
@@ -333,7 +334,7 @@ SPEC CHECKSUMS:
   fk_user_agent: 1f47ec39291e8372b1d692b50084b0d54103c545
   Flutter: e0871f40cf51350855a761d2e70bf5af5b9b5de7
   flutter_appauth: 1ce438877bc111c5d8f42da47729909290624886
-  flutter_charset_detector_ios: 5157d0104855b9deb78e1395515a287197bc2d55
+  flutter_charset_detector_darwin: fb3692d6d72cb6afcce7b0dd1a9516be6e78556e
   flutter_downloader: b7301ae057deadd4b1650dc7c05375f10ff12c39
   flutter_image_compress_common: ec1d45c362c9d30a3f6a0426c297f47c52007e3e
   flutter_inappwebview_ios: 97215cf7d4677db55df76782dbd2930c5e1c1ea0
diff --git a/lib/features/public_asset/presentation/public_asset_bindings.dart b/lib/features/public_asset/presentation/public_asset_bindings.dart
index 8527be196a..714e28d71f 100644
--- a/lib/features/public_asset/presentation/public_asset_bindings.dart
+++ b/lib/features/public_asset/presentation/public_asset_bindings.dart
@@ -1,6 +1,7 @@
 import 'package:core/data/network/dio_client.dart';
 import 'package:core/data/network/download/download_client.dart';
 import 'package:core/utils/application_manager.dart';
+import 'package:core/utils/file_utils.dart';
 import 'package:get/get.dart';
 import 'package:jmap_dart_client/http/http_client.dart';
 import 'package:tmail_ui_user/features/base/base_bindings.dart';
@@ -38,7 +39,10 @@ class PublicAssetBindings extends BaseBindings {
   @override
   void dependencies() {
     Get.lazyPut(
-      () => FileUploader(Get.find<DioClient>(tag: BindingTag.isolateTag), Get.find<Executor>()),
+      () => FileUploader(
+              Get.find<DioClient>(tag: BindingTag.isolateTag),
+              Get.find<Executor>(),
+              Get.find<FileUtils>()),
       tag: BindingTag.publicAssetBindingsTag);
     Get.lazyPut(
       () => PublicAssetApi(Get.find<HttpClient>(), Get.find<Uuid>()),
diff --git a/lib/features/upload/data/network/file_uploader.dart b/lib/features/upload/data/network/file_uploader.dart
index 5d5d02d9ea..a424357fb7 100644
--- a/lib/features/upload/data/network/file_uploader.dart
+++ b/lib/features/upload/data/network/file_uploader.dart
@@ -123,11 +123,13 @@ class FileUploader {
       );
       log('FileUploader::_handleUploadAttachmentAction(): RESULT_JSON = $resultJson');
       if (argsUpload.mobileFileUpload.mimeType == FileUtils.TEXT_PLAIN_MIME_TYPE) {
-        final fileCharset = await argsUpload.fileUtils.getFileCharset(argsUpload.mobileFileUpload.filePath);
+        final fileCharset = await argsUpload.fileUtils.getCharsetFromBytes(
+          File(argsUpload.mobileFileUpload.filePath).readAsBytesSync()
+        );
         return _parsingResponse(
           resultJson: resultJson,
           fileName: argsUpload.mobileFileUpload.fileName,
-          fileCharset: fileCharset);
+          fileCharset: fileCharset.toLowerCase());
       } else {
         return _parsingResponse(
           resultJson: resultJson,
@@ -140,7 +142,7 @@ class FileUploader {
         requestOptions: exception.requestOptions.copyWith(data: ''));
     } catch (exception) {
       logError('FileUploader::_handleUploadAttachmentAction():OtherException: $exception');
-      
+
       rethrow;
     }
   }
@@ -181,8 +183,18 @@ class FileUploader {
         );
       }
     );
-    log('FileUploader::_handleUploadAttachmentActionOnWeb():resultJson: $resultJson');
-    return _parsingResponse(resultJson: resultJson, fileName: fileInfo.fileName);
+    log('FileUploader::_handleUploadAttachmentActionOnWeb(): RESULT_JSON = $resultJson');
+    if (fileInfo.mimeType == FileUtils.TEXT_PLAIN_MIME_TYPE) {
+      final fileCharset = await _fileUtils.getCharsetFromBytes(fileInfo.bytes!);
+      return _parsingResponse(
+        resultJson: resultJson,
+        fileName: fileInfo.fileName,
+        fileCharset: fileCharset.toLowerCase());
+    } else {
+      return _parsingResponse(
+        resultJson: resultJson,
+        fileName: fileInfo.fileName);
+    }
   }
 
   static Attachment _parsingResponse({
diff --git a/model/pubspec.lock b/model/pubspec.lock
index d2938fe2f5..37f9ab77ca 100644
--- a/model/pubspec.lock
+++ b/model/pubspec.lock
@@ -337,10 +337,10 @@ packages:
     dependency: transitive
     description:
       name: flutter_charset_detector
-      sha256: "45de8a4b4255c1ea850a30955e7456091899ed4ff8b75593e14ec59f629b4b56"
+      sha256: "5d4796d43dac2f37e14149b0f0c676fa08e8eb1ada8e99342a838d971d2fb9b1"
       url: "https://pub.dev"
     source: hosted
-    version: "2.0.0"
+    version: "3.0.0"
   flutter_charset_detector_android:
     dependency: transitive
     description:
@@ -349,14 +349,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.1"
-  flutter_charset_detector_ios:
+  flutter_charset_detector_darwin:
     dependency: transitive
     description:
-      name: flutter_charset_detector_ios
-      sha256: e0e2c7b819cd1f7c9a50da94bf7f0e6d7a095eb64e81196ec758e77793903d43
+      name: flutter_charset_detector_darwin
+      sha256: daac20390275efb92fbb14350fe11286c5e29c7b80d6b0867f52d760f0d69763
       url: "https://pub.dev"
     source: hosted
-    version: "1.0.2"
+    version: "1.1.0"
   flutter_charset_detector_platform_interface:
     dependency: transitive
     description:
@@ -365,6 +365,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.1.0"
+  flutter_charset_detector_web:
+    dependency: transitive
+    description:
+      name: flutter_charset_detector_web
+      sha256: d8495115abada771c75f9395aae3e5809ffd506e8fc8f62b403ae11fc29e1d2b
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.2"
   flutter_image_compress:
     dependency: transitive
     description:
diff --git a/pubspec.lock b/pubspec.lock
index c08731e4f1..7032bc7477 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -659,10 +659,10 @@ packages:
     dependency: transitive
     description:
       name: flutter_charset_detector
-      sha256: "45de8a4b4255c1ea850a30955e7456091899ed4ff8b75593e14ec59f629b4b56"
+      sha256: "5d4796d43dac2f37e14149b0f0c676fa08e8eb1ada8e99342a838d971d2fb9b1"
       url: "https://pub.dev"
     source: hosted
-    version: "2.0.0"
+    version: "3.0.0"
   flutter_charset_detector_android:
     dependency: transitive
     description:
@@ -671,14 +671,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.0.1"
-  flutter_charset_detector_ios:
+  flutter_charset_detector_darwin:
     dependency: transitive
     description:
-      name: flutter_charset_detector_ios
-      sha256: e0e2c7b819cd1f7c9a50da94bf7f0e6d7a095eb64e81196ec758e77793903d43
+      name: flutter_charset_detector_darwin
+      sha256: d17c1847366a0501449d95d18a43417585841afe10200ceefb4422e6b7fccefb
       url: "https://pub.dev"
     source: hosted
-    version: "1.0.2"
+    version: "1.0.0"
   flutter_charset_detector_platform_interface:
     dependency: transitive
     description:
@@ -687,6 +687,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.0.0"
+  flutter_charset_detector_web:
+    dependency: transitive
+    description:
+      name: flutter_charset_detector_web
+      sha256: d8495115abada771c75f9395aae3e5809ffd506e8fc8f62b403ae11fc29e1d2b
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.2"
   flutter_colorpicker:
     dependency: transitive
     description:
diff --git a/test/features/identity_creator/presentation/identity_creator_controller_test.dart b/test/features/identity_creator/presentation/identity_creator_controller_test.dart
index 3a00dcf15f..2040407d43 100644
--- a/test/features/identity_creator/presentation/identity_creator_controller_test.dart
+++ b/test/features/identity_creator/presentation/identity_creator_controller_test.dart
@@ -7,6 +7,7 @@ import 'package:core/presentation/utils/responsive_utils.dart';
 import 'package:core/utils/application_manager.dart';
 import 'package:core/utils/platform_info.dart';
 import 'package:dartz/dartz.dart' hide State;
+import 'package:core/utils/file_utils.dart';
 import 'package:flutter/widgets.dart' hide State;
 import 'package:flutter_test/flutter_test.dart';
 import 'package:get/get.dart';
@@ -74,6 +75,7 @@ import 'identity_creator_controller_test.mocks.dart';
   MockSpec<IdentityUtils>(),
   MockSpec<DioClient>(),
   MockSpec<Executor>(),
+  MockSpec<FileUtils>(),
   MockSpec<RemoteExceptionThrower>(),
   MockSpec<DownloadClient>(),
   MockSpec<HtmlAnalyzer>(),
@@ -155,6 +157,7 @@ void main() {
 
     Get.put<DioClient>(MockDioClient(), tag: BindingTag.isolateTag);
     Get.put<Executor>(MockExecutor());
+    Get.put<FileUtils>(MockFileUtils());
     Get.put<RemoteExceptionThrower>(MockRemoteExceptionThrower());
     Get.put<DownloadClient>(MockDownloadClient());
     Get.put<HtmlAnalyzer>(MockHtmlAnalyzer());
@@ -182,7 +185,7 @@ void main() {
       true,
       {CapabilityIdentifier.jmapPublicAsset: DefaultCapability({})});
     final session = Session(
-      {}, 
+      {},
       {accountId: account},
       {}, UserName('value'), Uri(), Uri(), Uri(), Uri(), State('value'));
 
@@ -271,14 +274,14 @@ void main() {
       final context = MockBuildContext();
       identityCreatorController.updateNameIdentity(context, identityName);
       identityCreatorController.updateContentHtmlEditor(htmlContent);
-      
+
       identityCreatorController.onUnloadBrowserListener(Event(''));
       await untilCalled(mockSaveIdentityCacheOnWebInteractor.execute(
         any,
         any,
         identityCache: anyNamed('identityCache'),
       ));
-      
+
       // assert
       verify(mockSaveIdentityCacheOnWebInteractor.execute(
         accountId,
@@ -321,14 +324,14 @@ void main() {
       final context = MockBuildContext();
       identityCreatorController.updateNameIdentity(context, identityName);
       identityCreatorController.updateContentHtmlEditor(htmlContent);
-      
+
       identityCreatorController.onBeforeReconnect();
       await untilCalled(mockSaveIdentityCacheOnWebInteractor.execute(
         any,
         any,
         identityCache: anyNamed('identityCache'),
       ));
-      
+
       // assert
       verify(mockSaveIdentityCacheOnWebInteractor.execute(
         accountId,
diff --git a/web/index.html b/web/index.html
index 16d48b3d38..c54b494cc0 100644
--- a/web/index.html
+++ b/web/index.html
@@ -36,6 +36,7 @@
   <meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" name="viewport">
 
   <script type="application/javascript" src="assets/packages/flutter_inappwebview_web/assets/web/web_support.js" defer></script>
+  <script type="application/javascript" src="assets/packages/flutter_charset_detector_web/assets/web/jschardet.min.js" defer></script>
   <script src="splash/splash.js"></script>
   <script src="worker_service/worker_service.js"></script>
   <script src="i18n/translater.js"></script>