diff --git a/lib/Epub/Epub/converters/JpegToFramebufferConverter.cpp b/lib/Epub/Epub/converters/JpegToFramebufferConverter.cpp
index 4c23323e..fbb3e96b 100644
--- a/lib/Epub/Epub/converters/JpegToFramebufferConverter.cpp
+++ b/lib/Epub/Epub/converters/JpegToFramebufferConverter.cpp
@@ -9,6 +9,9 @@
 #include <cstdio>
 #include <cstring>
 
+#include "DitherUtils.h"
+#include "PixelCache.h"
+
 struct JpegContext {
   FsFile& file;
   uint8_t buffer[512];
@@ -17,108 +20,6 @@ struct JpegContext {
   JpegContext(FsFile& f) : file(f), bufferPos(0), bufferFilled(0) {}
 };
 
-// Cache buffer for storing 2-bit pixels during decode
-struct PixelCache {
-  uint8_t* buffer;
-  int width;
-  int height;
-  int bytesPerRow;
-  int originX;  // config.x - to convert screen coords to cache coords
-  int originY;  // config.y
-
-  PixelCache() : buffer(nullptr), width(0), height(0), bytesPerRow(0), originX(0), originY(0) {}
-
-  bool allocate(int w, int h, int ox, int oy) {
-    width = w;
-    height = h;
-    originX = ox;
-    originY = oy;
-    bytesPerRow = (w + 3) / 4;  // 2 bits per pixel, 4 pixels per byte
-    size_t bufferSize = bytesPerRow * h;
-    buffer = (uint8_t*)malloc(bufferSize);
-    if (buffer) {
-      memset(buffer, 0, bufferSize);
-      Serial.printf("[%lu] [JPG] Allocated cache buffer: %d bytes for %dx%d\n", millis(), bufferSize, w, h);
-    }
-    return buffer != nullptr;
-  }
-
-  void setPixel(int screenX, int screenY, uint8_t value) {
-    if (!buffer) return;
-    int localX = screenX - originX;
-    int localY = screenY - originY;
-    if (localX < 0 || localX >= width || localY < 0 || localY >= height) return;
-
-    int byteIdx = localY * bytesPerRow + localX / 4;
-    int bitShift = 6 - (localX % 4) * 2;  // MSB first: pixel 0 at bits 6-7
-    buffer[byteIdx] = (buffer[byteIdx] & ~(0x03 << bitShift)) | ((value & 0x03) << bitShift);
-  }
-
-  bool writeToFile(const std::string& cachePath) {
-    if (!buffer) return false;
-
-    FsFile cacheFile;
-    if (!SdMan.openFileForWrite("IMG", cachePath, cacheFile)) {
-      Serial.printf("[%lu] [JPG] Failed to open cache file for writing: %s\n", millis(), cachePath.c_str());
-      return false;
-    }
-
-    uint16_t w = width;
-    uint16_t h = height;
-    cacheFile.write(&w, 2);
-    cacheFile.write(&h, 2);
-    cacheFile.write(buffer, bytesPerRow * height);
-    cacheFile.close();
-
-    Serial.printf("[%lu] [JPG] Cache written: %s (%dx%d, %d bytes)\n", millis(), cachePath.c_str(), width, height,
-                  4 + bytesPerRow * height);
-    return true;
-  }
-
-  ~PixelCache() {
-    if (buffer) {
-      free(buffer);
-      buffer = nullptr;
-    }
-  }
-};
-
-// 4x4 Bayer matrix for ordered dithering
-static const uint8_t bayer4x4[4][4] = {
-    {0, 8, 2, 10},
-    {12, 4, 14, 6},
-    {3, 11, 1, 9},
-    {15, 7, 13, 5},
-};
-
-// Apply Bayer dithering and quantize to 4 levels (0-3)
-// Stateless - works correctly with any pixel processing order (ideal for MCU-based decoding)
-static uint8_t applyBayerDither4Level(uint8_t gray, int x, int y) {
-  int bayer = bayer4x4[y & 3][x & 3];
-  int dither = (bayer - 8) * 5;  // Scale to ±40 (half of quantization step 85)
-
-  int adjusted = gray + dither;
-  if (adjusted < 0) adjusted = 0;
-  if (adjusted > 255) adjusted = 255;
-
-  if (adjusted < 64) return 0;
-  if (adjusted < 128) return 1;
-  if (adjusted < 192) return 2;
-  return 3;
-}
-
-// Draw a pixel respecting the current render mode for grayscale support
-static void drawPixelWithRenderMode(GfxRenderer& renderer, int x, int y, uint8_t pixelValue) {
-  GfxRenderer::RenderMode renderMode = renderer.getRenderMode();
-  if (renderMode == GfxRenderer::BW && pixelValue < 3) {
-    renderer.drawPixel(x, y, true);
-  } else if (renderMode == GfxRenderer::GRAYSCALE_MSB && (pixelValue == 1 || pixelValue == 2)) {
-    renderer.drawPixel(x, y, false);
-  } else if (renderMode == GfxRenderer::GRAYSCALE_LSB && pixelValue == 1) {
-    renderer.drawPixel(x, y, false);
-  }
-}
-
 bool JpegToFramebufferConverter::getDimensionsStatic(const std::string& imagePath, ImageDimensions& out) {
   FsFile file;
   if (!SdMan.openFileForRead("JPG", imagePath, file)) {