Convert BMP to PNG Online — Free
Runs 100% in your browser — your files never leave your device.
BMP carries every pixel uncompressed, which makes it faithful but heavy. PNG keeps the same lossless fidelity at a fraction of the size, with broad support everywhere. Convert locally in your browser — the pixels are never re-compressed with loss.
How it works
- 1
Drop your BMP file
Drag a BMP into the box, or click to browse. Nothing is uploaded.
- 2
Convert to PNG
The bitmap is decoded and re-encoded as a lossless PNG locally.
- 3
Download the result
Save the PNG with one click, or drop another file to convert it.
About this tool
Converting BMP to PNG
A BMP file bmp stores pixels essentially uncompressed — enormous files, zero quality loss, and roots deep in legacy windows software that only accepts it.. PNG png stores every pixel losslessly and supports full transparency, which makes it the standard for screenshots, logos, and graphics — at the cost of larger files for photographs.. Converting moves your image from the first set of trade-offs to the second: the uncompressed bulk shrinks, transparency survives where supported, and pixel data is re-mapped to the target format exactly.
What to check after converting
Open the result and check the two things conversion can change: transparency and size. Transparency is carried over exactly where the target format supports it. Your original file stays untouched on your device either way, and the download is a brand-new file.
Frequently asked questions
Is this conversion lossless?
Yes — both BMP and PNG store pixels losslessly, so the conversion moves your image between formats without touching a single value. The file size changes; the pixels do not.
Is my image uploaded anywhere?
No — the conversion runs entirely in your browser. The image is processed on your device and never sent to any server, which you can verify by disconnecting after the page loads.
Why convert BMP to PNG instead of the other way around?
The direction follows what the destination needs: graphics, screenshots, and anything needing transparency versus legacy Windows compatibility. Converting back is always available — but each lossy hop re-encodes the image, so keep the highest-quality format as your working copy and convert toward the destination.