BMP to PNG Converter — Free & Private
Someone has sent you bitmaps and they are absurdly large. Convert it here — in your browser, with nothing uploaded anywhere.
Why convert BMP to PNG?
BMP stores raw pixels with essentially no compression, so a screenshot that would be a few hundred kilobytes as a PNG arrives as several megabytes. PNG is also lossless, so this conversion changes not a single pixel value — it simply stores the same information properly. Expect the file to shrink dramatically, often by 80% or more, with the image bit-for-bit identical.
The catch worth knowing about
BMP has no alpha channel, so there is no transparency to preserve. The PNG will have a transparency channel available, but everything in it will be opaque — this conversion cannot invent a transparent background that the BMP never had.
One tip before you start
This is the one conversion on the site with no downside at all. Both formats are lossless, so there is no quality decision to make and nothing to weigh up — the PNG is simply a better-packed copy.
BMP vs PNG — quick comparison
| BMP | PNG | |
|---|---|---|
| Best for | Windows Bitmap — raw uncompressed pixels with a small header. Nothing is lost and nothing is compressed, so the files are enormous. | Lossless format with transparency support. Larger files but pixel-perfect — ideal for logos, screenshots and graphics. |
| File size | Very large — no compression at all | Large for photographs, efficient for flat colour |
| Transparency | No | Yes, full 8-bit alpha |
| Where it opens | Universal on Windows; awkward elsewhere | Universal |
How to convert BMP to PNG
- Drop your BMP files into the box above (or click to browse).
- Press Convert — it happens instantly on your device.
- Download each converted file, or grab them all as a ZIP.
Frequently asked questions
Why would I convert BMP to PNG?
Someone has sent you bitmaps and they are absurdly large. BMP stores raw pixels with essentially no compression, so a screenshot that would be a few hundred kilobytes as a PNG arrives as several megabytes. PNG is also lossless, so this conversion changes not a single pixel value — it simply stores the same information properly. Expect the file to shrink dramatically, often by 80% or more, with the image bit-for-bit identical.
What should I watch out for when converting BMP to PNG?
BMP has no alpha channel, so there is no transparency to preserve. The PNG will have a transparency channel available, but everything in it will be opaque — this conversion cannot invent a transparent background that the BMP never had.
Any tips for getting the best PNG out of a BMP file?
This is the one conversion on the site with no downside at all. Both formats are lossless, so there is no quality decision to make and nothing to weigh up — the PNG is simply a better-packed copy.
Will I lose quality converting BMP to PNG?
No. PNG is lossless, so every pixel survives the conversion exactly. The file gets bigger in exchange, particularly for photographs.
Do my BMP files get uploaded?
No. The conversion runs on your device, in the browser tab you are reading this in. You can prove it: disconnect from the internet and convert anyway.
Is it free, and how many BMP files can I do at once?
Free, with no sign-up, no watermark and no daily limit. Up to 200 files per batch, downloadable individually or as one ZIP.
Related conversions
PNG is not the only thing a BMP file can become, and BMP is not the only thing that converts to PNG. These run on the same converter, on your device, with the same 200-file batch limit.