Convert BMP images to PNG online for free. Upload one file or many, choose the quality and maximum size, then download the PNG results one by one or all together in a ZIP. No sign-up needed.
BMP files from Paint and older Windows programs are usually uncompressed and huge. PNG is lossless too, but compressed, so the same picture often becomes many times smaller and works on every website and app.
There is rarely a reason to keep BMP, except for old software that only reads BMP.
BMP is a simple image format from Windows that usually stores pixels with little or no compression, so files are large compared with JPG, PNG or WebP. It is rarely used on the web, and converting a BMP is the easiest way to make it small enough to share.
More BMP conversionsPNG stores images with lossless compression and supports full transparency, which makes it the usual choice for logos, screenshots and graphics with sharp edges. The trade-off is size: a photograph saved as PNG is normally far larger than the same photo saved as JPG or WebP.
More PNG conversions| Feature | BMP | PNG |
|---|---|---|
| Full name | Bitmap | Portable Network Graphics |
| Compression | Usually uncompressed | Lossless |
| Transparency | No | Yes |
| Animation | No | No |
| Introduced | 1990 | 1996 |
| Developed by | Microsoft | PNG Development Group (W3C) |
| Best for | Legacy Windows software | Logos, screenshots and graphics with transparency |
Not at Quality 100: PNG is lossless.
Often 3 to 10 times smaller, depending on the image.
Click Select File or drop your BMP file onto the upload box. Pick the quality and maximum size, and the converted PNG appears in the list below with a download button. You can add many files at once and download them together as a ZIP.
Yes. There is no sign-up and no watermark. To keep the service available for everyone there is a 95MB limit per file and a cap on how many files one connection can process in a short period.
Your upload is used only to make the converted file. Images are processed in memory; other files are written to a private temporary folder that is deleted as soon as the conversion finishes. Nothing is kept after the result has been sent back.
For images, a little, by design: the image is re-encoded at the Quality you choose (default 75%). Audio and video are re-encoded with high-quality settings; documents keep their text and layout as far as the target format allows. Converting never restores detail that is already missing from the original.