Convert BMP to PNG online
Convert BMP files to PNG directly in your browser. Your images never leave your device — all processing happens locally for instant, private results.
BMP is an uncompressed Windows bitmap format that stores raw pixel data, producing large but simple, lossless files. PNG is a lossless format with transparency support, standardised in 1996 and ideal for graphics, logos and screenshots. To convert BMP to PNG, drop your files into the tool above — conversion runs entirely in your browser, so nothing is ever uploaded.
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Drop your images here
or click to choose files
How to convert BMP to PNG
- 1
Drop your BMP files into the box above, or click to choose them from your device.
- 2
Adjust the quality slider if you want — the default works for most uses.
- 3
Click Convert and wait a moment while your browser processes the files.
- 4
Download each converted PNG file individually, or grab them all as a ZIP archive.
BMP vs PNG comparison
| BMP | PNG | |
|---|---|---|
| Compression | lossless | lossless |
| Alpha (transparency) | ✓ | ✓ |
| Animation | — | — |
| Vector | — | — |
| Relative size | ~10× JPG | ~2.5× JPG |
| Browser support | Universal — all browsers | Universal — all browsers since 1996 |
- PNG files are typically smaller than BMP, which saves storage space and bandwidth.
BMP and PNG are both raster image formats, but they make different trade-offs in compression, transparency, animation and compatibility — the comparison table above lays out exactly how they differ. Converting between the two lets you pick the right format for each situation: keep originals in one format for archival and export copies in another for sharing or web use. Our converter runs entirely client-side using modern WebAssembly codecs, so conversion is fast, private, and works even on patchy mobile connections. There are no daily limits, no watermarks, no signup, and no ads tracking you across the web. The same engine powers every conversion on this site, and we lazy-load only the codecs needed for your specific BMP to PNG conversion — keeping the initial page download tiny.
Frequently asked questions
Is this BMP to PNG converter really free?
Yes — completely free, no signup, no watermarks, no per-day limits.
Do you upload my files to a server?
No. All conversion happens in your browser using WebAssembly. Your files never leave your device.
What is the maximum file size?
50 MB per file, with up to 20 files per batch. On mobile devices we recommend smaller files for memory reasons.
Can I convert multiple BMP files at once?
Yes — drop up to 20 files at once and download them all as a ZIP archive.
Does this work on iPhone and Android?
Yes, the converter works in any modern mobile browser including Safari and Chrome.
Will I lose quality converting from BMP to PNG?
Quality depends on the formats and your chosen quality setting. Lossless formats like PNG preserve every pixel; lossy formats like JPEG let you trade quality for smaller files.
Why convert BMP to PNG?
It depends on what you need. BMP and PNG differ in file size, transparency support, quality and compatibility — the comparison table on this page shows exactly how, so you can pick whichever fits your use case.
Is PNG better than BMP?
Neither is universally better — each makes different trade-offs. Check the comparison above: it spells out the differences in compression, transparency, animation and browser support between BMP and PNG so you can decide for your specific need.
Why is my converted PNG file a different size than the BMP original?
Each format compresses pixels differently. Switching from BMP to PNG re-encodes the image, so the output can be larger or smaller depending on the formats and the quality setting you choose — the comparison table shows the typical direction.