Convert BMP to PNG
Free · no signup · no watermark · nothing is stored · batch up to 20 files
Drop your BMP files here
or click to choose — up to 20 at once
Select BMP fileThis runs entirely in your browser. The file never leaves your machine and nothing is uploaded. Need test files? Try our free sample files.
This free BMP to PNG converter turns your .bmp images into .png files. BMP turns up from legacy Windows software and scanners. It stores raw uncompressed pixels, so files are enormous for what they contain.
Because browsers cannot write PNG, this one runs on our server: the file is converted in memory and sent straight back. It is never written to disk, never logged and never stored.
How to convert BMP to PNG
- Drop your BMP files onto the box above, or click it to choose from your computer. Up to 20 at once.
- The conversion starts as soon as the file is read — there is nothing to configure.
- Download each converted file, or pick them up one by one from the list.
What changes when you convert BMP to PNG
Both formats can represent the same content here, so nothing meaningful is lost. Expect the file size to change, since BMP and PNG compress differently.
BMP and PNG compared
| BMP | PNG | |
|---|---|---|
| Full name | Windows Bitmap | Portable Network Graphics |
| Extension | .bmp | .png |
| MIME type | image/bmp | image/png |
| Compression | Lossless | Lossless |
| Transparency | No | Yes |
BMP: Uncompressed raw pixels, which makes the files enormous and the format trivial to parse. Mostly encountered coming out of legacy Windows software and scanners.
PNG: Lossless compression with full alpha transparency. The safe default for screenshots, logos, diagrams and anything with sharp edges or text, at the cost of larger files than JPG for photographs.
Frequently asked questions
How do I convert BMP to PNG?
Drop your .bmp file onto the box on this page and the .png file is ready to download in a second or two. There is no signup, no email, no watermark and no file limit beyond about 4 MB per upload — larger images are re-encoded smaller in your browser first, and the page says so when that happens.
Is this BMP to PNG converter free?
Yes, completely, with no account, no trial and no watermark on the output. We are a consultancy and these tools exist because we needed them ourselves; there is nothing to buy on this page.
Are my files uploaded anywhere?
This one has to run on our server, because browsers cannot write PNG. The file is converted in memory and returned immediately — it is never written to disk, never logged and never stored. If that is not acceptable for your file, use a desktop tool instead.
Will converting to PNG reduce the quality?
Both formats can represent the same content here, so nothing meaningful is lost. Expect the file size to change, since BMP and PNG compress differently.
Can I convert several BMP files at once?
Yes, up to 20 files in one go. Drop them all onto the box together and each one appears in the results list with its own download button.
Found a problem, or something that could be better? We read every message and we fix things quickly.
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