diff --git a/src/components/BitmapEditor/components/ExportDialog/index.tsx b/src/components/BitmapEditor/components/ExportDialog/index.tsx
index 63a0df6..e5c8dbf 100644
--- a/src/components/BitmapEditor/components/ExportDialog/index.tsx
+++ b/src/components/BitmapEditor/components/ExportDialog/index.tsx
@@ -1,6 +1,6 @@
 import { useBitmapsStore } from '@/stores/bitmaps';
 import { DataFormat, Platform, SizeFormat, exportBitmap } from './utils';
-import { useMemo } from 'react';
+import { useEffect, useMemo, useRef } from 'react';
 import { FormProvider, useForm } from 'react-hook-form';
 import { CheckBox } from '@/components/CheckBox';
 import { Input } from '@/components/Input';
@@ -46,9 +46,19 @@ export const ExportDialog = ({ bitmapId, area, onClose }: ExportDialogProps): JS
     defaultValues: { ...defaultValues, name: bitmapEntity?.name ?? '' },
   });
 
-  const { register, handleSubmit, watch } = methods;
+  const { register, handleSubmit, watch, setValue } = methods;
 
   const formValues = watch();
+  const prevPlatformRef = useRef(formValues.platform);
+
+  // Auto-select Pico-friendly bit order only when switching into RP Pico platform.
+  useEffect(() => {
+    if (prevPlatformRef.current !== Platform.Pico && formValues.platform === Platform.Pico) {
+      setValue('bitOrder', BitOrder.LSB);
+    }
+    prevPlatformRef.current = formValues.platform;
+  }, [formValues.platform, setValue]);
+
   const exportCode = useMemo<string>(
     () => (bitmapEntity ? exportBitmap({ bitmapEntity, area, ...formValues }) : ''),
     [area, bitmapEntity, formValues],
diff --git a/src/components/BitmapEditor/components/ExportDialog/utils.test.ts b/src/components/BitmapEditor/components/ExportDialog/utils.test.ts
index 74dbfdb..95aa1fb 100644
--- a/src/components/BitmapEditor/components/ExportDialog/utils.test.ts
+++ b/src/components/BitmapEditor/components/ExportDialog/utils.test.ts
@@ -109,15 +109,13 @@ describe('BitmapEditor/ExportDialog/utils', () => {
       });
 
       expect(result).toContain('// testbitmap.h');
-      expect(result).toContain('#ifndef TESTBITMAP_H');
-      expect(result).toContain('#define TESTBITMAP_H');
+      expect(result).toContain('#pragma once');
       expect(result).toContain('#include <stdint.h>');
       expect(result).toContain('#include "bitmap.h"');
       expect(result).toContain('const bitmap_t testbitmap = {');
       expect(result).toContain('.width = 8,');
       expect(result).toContain('.height = 8,');
       expect(result).toContain(`.data = (uint8_t[]){${expectedDataHex}}`);
-      expect(result).toContain('#endif // TESTBITMAP_H');
     });
   });
 
diff --git a/src/components/BitmapEditor/components/ExportDialog/utils.ts b/src/components/BitmapEditor/components/ExportDialog/utils.ts
index 8bf3ce5..6341a34 100644
--- a/src/components/BitmapEditor/components/ExportDialog/utils.ts
+++ b/src/components/BitmapEditor/components/ExportDialog/utils.ts
@@ -123,13 +123,12 @@ ${varType}${progMem} ${nameLower}[] = { ${dataArray} };
     .replace(/\n$/, '');
 };
 
-const exportForPico = ({ nameLower, nameUpper, width, height, dataArray }: PlatformExportParams): string => {
-  const headerName = `${nameUpper}_H`;
+const exportForPico = ({ nameLower, width, height, dataArray }: PlatformExportParams): string => {
   const includesBlock = ['#include <stdint.h>', '#include "bitmap.h"'].filter(Boolean).join('\n');
   return `
 // ${nameLower}.h
-#ifndef ${headerName}
-#define ${headerName}
+#pragma once
+
 ${includesBlock}
 
 const bitmap_t ${nameLower} = {
@@ -137,8 +136,6 @@ const bitmap_t ${nameLower} = {
   .height = ${height},
   .data = (uint8_t[]){${dataArray}}
 };
-
-#endif // ${headerName}
 `
     .replace(/^\n/, '')
     .replace(/\n$/, '');
diff --git a/src/pages/EditBitmap/index.test.tsx b/src/pages/EditBitmap/index.test.tsx
index eb96bc8..bf383d7 100644
--- a/src/pages/EditBitmap/index.test.tsx
+++ b/src/pages/EditBitmap/index.test.tsx
@@ -93,6 +93,28 @@ test('export bitmap', async () => {
   expect(spy).toHaveBeenCalledWith(exportCode);
 });
 
+test('select pico sets LSB bit order automatically', async () => {
+  const { userEvent } = await setupTest();
+  const exportButton = screen.getByText('Export to C');
+  expect(exportButton).toBeEnabled();
+  await userEvent.click(exportButton);
+
+  const msbRadio = screen.getByLabelText('MSB-first (Adafruit)');
+  const lsbRadio = screen.getByLabelText('LSB-first (U8g2, Pico)');
+  const picoRadio = screen.getByLabelText('RP Pico');
+
+  await userEvent.click(msbRadio);
+  expect((msbRadio as HTMLInputElement).checked).toBeTruthy();
+  expect((lsbRadio as HTMLInputElement).checked).toBeFalsy();
+
+  await userEvent.click(picoRadio);
+  expect((lsbRadio as HTMLInputElement).checked).toBeTruthy();
+
+  await userEvent.click(msbRadio);
+  expect((msbRadio as HTMLInputElement).checked).toBeTruthy();
+  expect((lsbRadio as HTMLInputElement).checked).toBeFalsy();
+});
+
 test('grid settings', async () => {
   const { userEvent, stores } = await setupTest();
   const gridButton = screen.getByText('Grid');