Step 1: Attach your BMP files using the button above or by bring and position.
Step 2: Click the 'Optimize' button to start the optimization.
Step 3: Collect your converted PNG files.
BMP to PNG Optimization FAQ
Will PNG actually be smaller than BMP?
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Almost always when going from PNG / JPG / TIFF into WebP or AVIF: expect 25-50% smaller than JPG at the same visual quality, 60-90% smaller than PNG. Going the other way (WebP / AVIF back to PNG = PNG / JPG) typically grows the file because you are leaving a more modern codec for an older one — useful for compatibility, not size.
Does BMP to PNG preserve transparency / alpha?
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Transparency survives when PNG supports alpha (PNG, WebP, AVIF, GIF, TIFF, SVG). Converting to JPG flattens the alpha channel onto white — if you need transparency on the modern web target WebP or AVIF instead of PNG.
Will the PNG version look identical to the BMP on a Retina display?
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At quality 80+ on WebP / AVIF the difference is invisible to anyone but a trained eye even at 3x device pixel ratio. Photos compress slightly more visibly than line art; if your BMP is screenshots or UI mockups, push quality to 90 or use a lossless PNG.
Will EXIF camera metadata survive BMP to PNG?
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Usually not. In most conversions, camera EXIF fields such as the camera model and GPS position are not carried into the PNG. There is no setting on this page to keep or remove metadata, so check the result with a metadata viewer if it matters.
Can I batch convert a folder of BMP files to PNG?
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Several files in one job need a paid plan. Free use is one file per conversion, one conversion an hour. On a paid plan you can add several files to one job, then download each result on its own or all of them in one ZIP.
Are my BMP files private during PNG conversion?
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Yes. Uploaded BMP files are processed on our own conversion servers, no person reviews them, and they are never shared. The upload and the converted PNG are both deleted automatically about 24 hours after the conversion, which leaves time to download the result. See /privacy/ for the full policy.
How do I serve the PNG with a BMP fallback on my site?
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Use a `<picture>` element: `<picture><source srcset="image.PNG" type="image/PNG"><img src="image.BMP" alt=""></picture>`. Browsers that understand PNG fetch the smaller file; older browsers fall back to BMP. WebP is supported in 96%+ of installed browsers, AVIF in 90%+.
Why is my PNG file unexpectedly bigger / smaller than I expected?
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A BMP that is already heavily compressed (low-quality JPG) often grows when re-encoded into a lossless PNG (PNG / TIFF). A high-bitrate lossless BMP (PNG / TIFF) often shrinks 60-90% when going to a lossy modern PNG (WebP / AVIF). Image content matters too — photos compress very differently from line art and screenshots.
