diff --git a/lib/main.dart b/lib/main.dart
index 5f0208a..9e4deb2 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -3,7 +3,6 @@ import 'package:desktop_webview_window/desktop_webview_window.dart';
 import 'package:dynamic_color/dynamic_color.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
-import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:rhttp/rhttp.dart';
 import 'package:venera/foundation/log.dart';
 import 'package:venera/pages/auth_page.dart';
@@ -197,11 +196,6 @@ class _MyAppState extends State<MyApp> with WidgetsBindingObserver {
           'dark' => ThemeMode.dark,
           _ => ThemeMode.system
         },
-        localizationsDelegates: const [
-          GlobalMaterialLocalizations.delegate,
-          GlobalWidgetsLocalizations.delegate,
-          GlobalCupertinoLocalizations.delegate,
-        ],
         locale: () {
           var lang = appdata.settings['language'];
           if (lang == 'system') {
diff --git a/lib/utils/image.dart b/lib/utils/image.dart
index b7488b8..9566634 100644
--- a/lib/utils/image.dart
+++ b/lib/utils/image.dart
@@ -26,7 +26,7 @@ class Image {
     var codec = await ui.instantiateImageCodec(data);
     var frame = await codec.getNextFrame();
     codec.dispose();
-    var info = await frame.image.toByteData();
+    var info = await frame.image.toByteData(format: ui.ImageByteFormat.rawStraightRgba);
     if (info == null) {
       throw Exception('Failed to decode image');
     }
@@ -39,6 +39,14 @@ class Image {
     return image;
   }
 
+  int getPixelAtIndex(int index) {
+    if (index < 0 || index >= _data.length) {
+      throw ArgumentError(
+          'Invalid argument: index must be in the range of [0, ${_data.length}).');
+    }
+    return _data[index];
+  }
+
   Image copyRange(int x, int y, int width, int height) {
     if (width + x > this.width) {
       throw ArgumentError('''
diff --git a/lib/utils/pdf.dart b/lib/utils/pdf.dart
index 95c8e2b..98bf521 100644
--- a/lib/utils/pdf.dart
+++ b/lib/utils/pdf.dart
@@ -1,33 +1,28 @@
+import 'dart:async';
+import 'dart:convert';
 import 'dart:isolate';
-
-import 'package:pdf/widgets.dart';
+import 'package:venera/foundation/app.dart';
 import 'package:venera/foundation/local.dart';
+import 'package:venera/utils/image.dart';
 import 'package:venera/utils/io.dart';
+import 'package:zip_flutter/zip_flutter.dart';
+
+typedef DecodeImage = Future<Image> Function(Uint8List data);
 
 Future<void> _createPdfFromComic({
   required LocalComic comic,
   required String savePath,
   required String localPath,
+  required DecodeImage decodeImage,
 }) async {
-  final pdf = Document(
-    title: comic.title,
-    author: comic.subTitle ?? "",
-    producer: "Venera",
-  );
-
-  pdf.document.outline;
+  var images = <String>[];
 
   var baseDir = comic.directory.contains('/') || comic.directory.contains('\\')
       ? comic.directory
       : FilePath.join(localPath, comic.directory);
 
   // add cover
-  var imageData = File(FilePath.join(baseDir, comic.cover)).readAsBytesSync();
-  pdf.addPage(Page(
-    build: (Context context) {
-      return Image(MemoryImage(imageData), fit: BoxFit.contain);
-    },
-  ));
+  images.add(FilePath.join(baseDir, comic.cover));
 
   bool multiChapters = comic.chapters != null;
 
@@ -51,42 +46,360 @@ Future<void> _createPdfFromComic({
     reorderFiles(files);
 
     for (var file in files) {
-      var imageData = (file as File).readAsBytesSync();
-      pdf.addPage(Page(
-        build: (Context context) {
-          return Image(MemoryImage(imageData), fit: BoxFit.contain);
-        },
-      ));
+      images.add(file.path);
     }
   } else {
     for (var chapter in comic.chapters!.keys) {
       var files = Directory(FilePath.join(baseDir, chapter)).listSync();
       reorderFiles(files);
       for (var file in files) {
-        var imageData = (file as File).readAsBytesSync();
-        pdf.addPage(Page(
-          build: (Context context) {
-            return Image(MemoryImage(imageData), fit: BoxFit.contain);
-          },
-        ));
+        images.add(file.path);
       }
     }
   }
 
-  final file = File(savePath);
-  file.writeAsBytesSync(await pdf.save());
+  var generator = PdfGenerator(
+    title: comic.title,
+    author: comic.subtitle,
+    imagePaths: images,
+    outputPath: savePath,
+    decodeImage: decodeImage,
+  );
+  await generator.generate();
+}
+
+Future<Isolate> _runIsolate(
+    LocalComic comic, String savePath, SendPort sendPort) {
+  var localPath = LocalManager().path;
+  return Isolate.spawn<SendPort>(
+    (sendPort) => overrideIO(
+      () async {
+        var receivePort = ReceivePort();
+        sendPort.send(receivePort.sendPort);
+
+        Completer<Image>? completer;
+
+        Future<Image> decodeImage(Uint8List data) async {
+          if (completer != null) {
+            throw Exception('Another image is being decoded');
+          }
+          sendPort.send(data);
+          completer = Completer();
+          return completer!.future;
+        }
+
+        receivePort.listen((message) {
+          if (message is Image) {
+            if (completer == null) {
+              throw Exception('No image is being decoded');
+            }
+            completer!.complete(message);
+            completer = null;
+          }
+        });
+
+        await _createPdfFromComic(
+          comic: comic,
+          savePath: savePath,
+          localPath: localPath,
+          decodeImage: decodeImage,
+        );
+
+        sendPort.send(null);
+      },
+    ),
+    sendPort,
+  );
 }
 
 Future<void> createPdfFromComicIsolate({
   required LocalComic comic,
   required String savePath,
 }) async {
-  var localPath = LocalManager().path;
-  return Isolate.run(() => overrideIO(() async {
-        return await _createPdfFromComic(
-          comic: comic,
-          savePath: savePath,
-          localPath: localPath,
-        );
-      }));
+  var receivePort = ReceivePort();
+  SendPort? sendPort;
+  Isolate? isolate;
+  var completer = Completer<void>();
+  receivePort.listen((message) {
+    if (message is SendPort) {
+      sendPort = message;
+    } else if (message is Uint8List) {
+      Image.decodeImage(message).then((image) {
+        sendPort!.send(image);
+      });
+    } else if (message == null) {
+      receivePort.close();
+      completer.complete();
+      isolate!.kill();
+    }
+  });
+  isolate = await _runIsolate(comic, savePath, receivePort.sendPort);
+  return completer.future;
+}
+
+class PdfGenerator {
+  final String title;
+  final String author;
+  final List<String> imagePaths;
+  final String outputPath;
+  final DecodeImage decodeImage;
+
+  // PDF文件的对象ID计数器
+  int _objectId = 1;
+
+  // 存储每个对象在PDF中的字节位置
+  final Map<int, int> _objectOffsets = {};
+
+  static const double a4Width = 595.0; // points
+  static const double a4Height = 842.0; // points
+
+  PdfGenerator({
+    required this.title,
+    required this.author,
+    required this.imagePaths,
+    required this.outputPath,
+    required this.decodeImage,
+  });
+
+  Future<void> generate() async {
+    var file = File(outputPath);
+    final output = file.openWrite();
+
+    int length = 0;
+
+    void write(String str) {
+      var data = utf8.encode(str);
+      output.add(data);
+      length += data.length;
+    }
+
+    void writeData(Uint8List data) {
+      output.add(data);
+      length += data.length;
+    }
+
+    int getCurrentLength() {
+      return length;
+    }
+
+    // 1. 写入PDF头部
+    write('%PDF-1.7\n%\xFF\xFF\xFF\xFF\n\n');
+
+    // 2. 写入Catalog对象
+    _objectOffsets[_objectId] = getCurrentLength();
+    write('$_objectId 0 obj\n');
+    write('<<\n');
+    write('/Type /Catalog\n');
+    write('/Pages ${_objectId + 1} 0 R\n');
+    write('>>\nendobj\n\n');
+
+    final catalogId = _objectId++;
+
+    // 3. 写入Pages对象
+    _objectOffsets[_objectId] = getCurrentLength();
+    write('$_objectId 0 obj\n');
+    write('<<\n');
+    write('/Type /Pages\n');
+    write('/Kids [');
+    final pageIds = <int>[];
+    for (var i = 0; i < imagePaths.length; i++) {
+      pageIds.add(_objectId + 1 + i * 3);
+      write('${_objectId + 1 + i * 3} 0 R ');
+    }
+    write(']\n');
+    write('/Count ${imagePaths.length}\n');
+    write('>>\nendobj\n\n');
+
+    final pagesId = _objectId++;
+
+    // 4. 为每个图片创建Page和Image对象
+    for (var i = 0; i < imagePaths.length; i++) {
+      final imagePath = imagePaths[i];
+      final image = await _getImage(imagePath);
+
+      // 写入Page对象
+      _objectOffsets[_objectId] = getCurrentLength();
+      write('$_objectId 0 obj\n');
+      write('<<\n');
+      write('/Type /Page\n');
+      write('/Parent $pagesId 0 R\n');
+      write('/Resources <<\n');
+      write('/XObject << /Im${i + 1} ${_objectId + 1} 0 R >>\n');
+      write('>>\n');
+      write('/MediaBox [0 0 $a4Width $a4Height]\n');
+      write('/Contents ${_objectId + 2} 0 R\n');
+      write('>>\nendobj\n\n');
+
+      _objectId++;
+
+      // 写入Image对象
+      _objectOffsets[_objectId] = getCurrentLength();
+      write('$_objectId 0 obj\n');
+      write('<<\n');
+      write('/Type /XObject\n');
+      write('/Subtype /Image\n');
+      write('/Width ${image.width}\n');
+      write('/Height ${image.height}\n');
+      write('/ColorSpace /DeviceRGB\n');
+      write('/BitsPerComponent 8\n');
+      write('/Filter /FlateDecode\n');
+      write('/Length ${image.data.length}\n');
+      write('>>\nstream\n');
+      writeData(image.data);
+      write('\nendstream\nendobj\n\n');
+
+      _objectId++;
+
+      // 写入Contents对象（绘制图片的指令）
+      _objectOffsets[_objectId] = getCurrentLength();
+      write('$_objectId 0 obj\n');
+      write('<<\n');
+      var stream = '';
+      stream += 'q\n';
+      // Calculate scaling factors
+      var scaleX = a4Width / image.width;
+      var scaleY = a4Height / image.height;
+      var scale = scaleX < scaleY ? scaleX : scaleY;
+      // Calculate centering offsets
+      var offsetX = (a4Width - (image.width * scale)) / 2;
+      var offsetY = (a4Height - (image.height * scale)) / 2;
+      // Apply transformation matrix
+      stream += '1 0 0 1 $offsetX $offsetY cm\n'; // Translate
+      stream += '${scale * image.width} 0 0 ${scale * image.height} 0 0 cm\n';
+      stream += '/Im${i + 1} Do\n';
+      stream += 'Q\n';
+      var streamData = utf8.encode(stream);
+      write('/Length ${streamData.length}\n');
+      write('>>\nstream\n');
+      writeData(streamData);
+      write('endstream\nendobj\n\n');
+
+      _objectId++;
+    }
+
+    // 5. 写入Info对象（元数据）
+    final infoId = _objectId;
+    _objectOffsets[_objectId] = getCurrentLength();
+    write('$_objectId 0 obj\n');
+    write('<<\n');
+    write('/Title <');
+    writeData(_toPdfString(title));
+    write('>\n');
+    write('/Author <');
+    writeData(_toPdfString(author));
+    write('>\n');
+    write('/Producer (venera v${App.version})\n');
+    write('/CreationDate (D:${_formatDateTime(DateTime.now())})\n');
+    write('>>\nendobj\n\n');
+
+    _objectId++;
+
+    // 6. 写入交叉引用表
+    final xrefOffset = getCurrentLength();
+    write('xref\n');
+    write('0 $_objectId\n');
+    write('0000000000 65535 f\r\n');
+
+    for (var i = 1; i < _objectId; i++) {
+      final offset = _objectOffsets[i]!;
+      write('${offset.toString().padLeft(10, '0')} 00000 n\r\n'); // 使用\r\n
+    }
+
+    // 7. 写入文件尾部
+    write('trailer\n');
+    write('<<\n');
+    write('/Size $_objectId\n');
+    write('/Root $catalogId 0 R\n');
+    write('/Info $infoId 0 R\n');
+    write('>>\n');
+    write('startxref\n');
+    write('$xrefOffset\n');
+    write('%%EOF\n');
+
+    await output.close();
+  }
+
+  int _codeUnitForDigit(int digit) =>
+      digit < 10 ? digit + 0x30 : digit + 0x61 - 10;
+
+  Uint8List _toPdfString(String str) {
+    Uint8List data;
+    try {
+      data = latin1.encode(str);
+    } catch (e) {
+      data = Uint8List.fromList(<int>[0xfe, 0xff] + _encodeUtf16be(str));
+    }
+    var result = <int>[];
+    for (final byte in data) {
+      result.add(_codeUnitForDigit((byte & 0xF0) >> 4));
+      result.add(_codeUnitForDigit(byte & 0x0F));
+    }
+    return Uint8List.fromList(result);
+  }
+
+  List<int> _encodeUtf16be(String str) {
+    const unicodeReplacementCharacterCodePoint = 0xfffd;
+    const unicodeByteZeroMask = 0xff;
+    const unicodeByteOneMask = 0xff00;
+    const unicodeValidRangeMax = 0x10ffff;
+    const unicodePlaneOneMax = 0xffff;
+    const unicodeUtf16ReservedLo = 0xd800;
+    const unicodeUtf16ReservedHi = 0xdfff;
+    const unicodeUtf16Offset = 0x10000;
+    const unicodeUtf16SurrogateUnit0Base = 0xd800;
+    const unicodeUtf16SurrogateUnit1Base = 0xdc00;
+    const unicodeUtf16HiMask = 0xffc00;
+    const unicodeUtf16LoMask = 0x3ff;
+
+    final encoding = <int>[];
+
+    void add(int unit) {
+      encoding.add((unit & unicodeByteOneMask) >> 8);
+      encoding.add(unit & unicodeByteZeroMask);
+    }
+
+    for (final unit in str.codeUnits) {
+      if ((unit >= 0 && unit < unicodeUtf16ReservedLo) ||
+          (unit > unicodeUtf16ReservedHi && unit <= unicodePlaneOneMax)) {
+        add(unit);
+      } else if (unit > unicodePlaneOneMax && unit <= unicodeValidRangeMax) {
+        final base = unit - unicodeUtf16Offset;
+        add(unicodeUtf16SurrogateUnit0Base +
+            ((base & unicodeUtf16HiMask) >> 10));
+        add(unicodeUtf16SurrogateUnit1Base + (base & unicodeUtf16LoMask));
+      } else {
+        add(unicodeReplacementCharacterCodePoint);
+      }
+    }
+    return encoding;
+  }
+
+  // 格式化日期时间
+  String _formatDateTime(DateTime dt) {
+    return dt
+        .toUtc()
+        .toString()
+        .replaceAll('-', '')
+        .replaceAll(':', '')
+        .replaceAll(' ', '')
+        .replaceAll('.', '')
+        .substring(0, 14);
+  }
+
+  Future<({int width, int height, Uint8List data})> _getImage(
+      String imagePath) async {
+    var data = await File(imagePath).readAsBytes();
+    var image = await decodeImage(data);
+    var width = image.width;
+    var height = image.height;
+    data = Uint8List(width * height * 3);
+    for (var i = 0; i < width * height; i++) {
+      var pixel = image.getPixelAtIndex(i); // RGBA
+      data[i * 3] = pixel & 0xFF; // R
+      data[i * 3 + 1] = (pixel >> 8) & 0xFF; // G
+      data[i * 3 + 2] = (pixel >> 16) & 0xFF; // B
+    }
+    data = tdeflCompressData(data, true, true, 9);
+    return (width: width, height: height, data: data);
+  }
 }
diff --git a/pubspec.lock b/pubspec.lock
index 1512006..262d70b 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -33,14 +33,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.0.4"
-  archive:
-    dependency: transitive
-    description:
-      name: archive
-      sha256: cb6a278ef2dbb298455e1a713bda08524a175630ec643a242c399c932a0a1f7d
-      url: "https://pub.dev"
-    source: hosted
-    version: "3.6.1"
   args:
     dependency: transitive
     description:
@@ -57,14 +49,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.11.0"
-  barcode:
-    dependency: transitive
-    description:
-      name: barcode
-      sha256: ab180ce22c6555d77d45f0178a523669db67f95856e3378259ef2ffeb43e6003
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.2.8"
   battery_plus:
     dependency: "direct main"
     description:
@@ -81,14 +65,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.0.1"
-  bidi:
-    dependency: transitive
-    description:
-      name: bidi
-      sha256: "9a712c7ddf708f7c41b1923aa83648a3ed44cfd75b04f72d598c45e5be287f9d"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.0.12"
   boolean_selector:
     dependency: transitive
     description:
@@ -392,11 +368,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "5.0.0"
-  flutter_localizations:
-    dependency: "direct main"
-    description: flutter
-    source: sdk
-    version: "0.0.0"
   flutter_memory_info:
     dependency: "direct main"
     description:
@@ -521,14 +492,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.1.0"
-  image:
-    dependency: transitive
-    description:
-      name: image
-      sha256: f31d52537dc417fdcde36088fdf11d191026fd5e4fae742491ebd40e5a8bea7d
-      url: "https://pub.dev"
-    source: hosted
-    version: "4.3.0"
   intl:
     dependency: "direct main"
     description:
@@ -690,14 +653,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.9.0"
-  path_parsing:
-    dependency: transitive
-    description:
-      name: path_parsing
-      sha256: "883402936929eac138ee0a45da5b0f2c80f89913e6dc3bf77eb65b84b409c6ca"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.1.0"
   path_provider:
     dependency: "direct main"
     description:
@@ -746,14 +701,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.3.0"
-  pdf:
-    dependency: "direct main"
-    description:
-      name: pdf
-      sha256: "05df53f8791587402493ac97b9869d3824eccbc77d97855f4545cf72df3cae07"
-      url: "https://pub.dev"
-    source: hosted
-    version: "3.11.1"
   petitparser:
     dependency: transitive
     description:
@@ -795,14 +742,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "3.9.1"
-  qr:
-    dependency: transitive
-    description:
-      name: qr
-      sha256: "5a1d2586170e172b8a8c8470bbbffd5eb0cd38a66c0d77155ea138d3af3a4445"
-      url: "https://pub.dev"
-    source: hosted
-    version: "3.0.2"
   rhttp:
     dependency: "direct main"
     description:
@@ -1131,7 +1070,7 @@ packages:
     source: hosted
     version: "6.5.0"
   yaml:
-    dependency: "direct main"
+    dependency: transitive
     description:
       name: yaml
       sha256: "75769501ea3489fca56601ff33454fe45507ea3bfb014161abc3b43ae25989d5"
@@ -1142,10 +1081,10 @@ packages:
     dependency: "direct main"
     description:
       name: zip_flutter
-      sha256: ea7fdc86c988174ef3bb80dc26e8e8bfdf634c55930e2d18d7e77e991acf0483
+      sha256: fe63ef9098bb2426b001adba2e28029820d71ce80cce957a36676bd6b3227245
       url: "https://pub.dev"
     source: hosted
-    version: "0.0.8"
+    version: "0.0.9"
 sdks:
   dart: ">=3.6.0 <4.0.0"
   flutter: ">=3.27.2"
diff --git a/pubspec.yaml b/pubspec.yaml
index 5489b8c..3c8a8fe 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -12,8 +12,6 @@ dependencies:
   flutter:
     sdk: flutter
   path_provider: any
-  flutter_localizations:
-    sdk: flutter
   intl: ^0.19.0
   window_manager: ^0.4.3
   sqlite3: ^2.4.7
@@ -25,7 +23,7 @@ dependencies:
   crypto: ^3.0.6
   dio: ^5.7.0
   html: ^0.15.5
-  pointycastle: any
+  pointycastle: ^3.9.1
   url_launcher: ^6.3.0
   path: ^1.9.0
   photo_view:
@@ -40,7 +38,6 @@ dependencies:
       ref: 09e756b1f1b04e6298318d99ec20a787fb360f59
       path: packages/scrollable_positioned_list
   flutter_reorderable_grid_view: ^5.4.0
-  yaml: any
   uuid: ^4.5.1
   desktop_webview_window:
     git:
@@ -51,7 +48,7 @@ dependencies:
   sliver_tools: ^0.2.12
   flutter_file_dialog: ^3.0.2
   file_selector: ^1.0.3
-  zip_flutter: ^0.0.8
+  zip_flutter: ^0.0.9
   lodepng_flutter:
     git:
       url: https://github.com/venera-app/lodepng_flutter
@@ -67,7 +64,6 @@ dependencies:
     git: 
       url: https://github.com/pkuislm/flutter_saf.git
       ref: 7637b8b67d0a831f3cd7e702b8173e300880d32e
-  pdf: ^3.11.1
   dynamic_color: ^1.7.0
   shimmer_animation: ^2.1.0
   flutter_memory_info: ^0.0.1