Free Online BMP to PNG

1. Upload a BMP image.
2. The browser decodes the bitmap and draws it to a canvas.
3. The canvas is re-encoded as a compressed lossless PNG.
4. Compare the BMP and PNG sizes in the preview panel.
5. Click Download PNG to save the smaller file.

BMP (Windows Bitmap) stores pixels with little or no compression, so files balloon quickly and many web tools and apps refuse them. PNG keeps the same lossless quality but applies DEFLATE compression, typically cutting BMP size by 50-80% with zero pixel loss — and it's accepted virtually everywhere.

This converter uses the browser's native BMP decoder to render the bitmap onto a canvas, then re-encodes it as PNG. Because both formats are lossless, the conversion is exact: every pixel in the BMP appears unchanged in the PNG, just stored far more efficiently.

The entire pipeline — decode, draw to canvas, encode — runs locally through the Canvas API. Your bitmap is never uploaded, so scans and legacy assets stay on your own device.