diff --git a/GfxUi.cpp b/GfxUi.cpp
index 6c0bc5e..c7f04d4 100644
--- a/GfxUi.cpp
+++ b/GfxUi.cpp
@@ -216,3 +216,13 @@ uint32_t GfxUi::read32(File &f) {
   ((uint8_t *)&result)[3] = f.read(); // MSB
   return result;
 }
+
+void GfxUi::copyProgmemToFile(const uint8_t *data, unsigned int image_len, String filename) {
+  File f = SPIFFS.open(filename, "w+");
+  for (int i = 0; i < image_len; i++) {
+    uint8_t c = pgm_read_byte(data++);
+    f.write(c);
+  }
+  f.close();
+}
+
diff --git a/GfxUi.h b/GfxUi.h
index 4be22f5..f92bac2 100644
--- a/GfxUi.h
+++ b/GfxUi.h
@@ -41,6 +41,7 @@ class GfxUi {
     void setTextColor(uint16_t c, uint16_t bg);
     void drawBmp(String filename, uint8_t x, uint16_t y);
     void drawProgressBar(uint16_t x, uint16_t y, uint16_t w, uint16_t h, uint8_t percentage, uint16_t frameColor, uint16_t barColor);
+    void copyProgmemToFile(const uint8_t *data, unsigned int image_len, String filename);
 
   private:
     Adafruit_ILI9341 * _tft;