BMP to PNG Converter
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Convert BMP to PNG online
Convert BMP to PNG to get the same image at a fraction of the size. BMP stores raw uncompressed pixels — a legacy Windows format that has no compression at all — while PNG stores the identical picture losslessly and typically several times smaller.
When should you convert BMP to PNG?
- Shrink screenshots or exports saved as BMP
- Make a legacy Windows image usable on the web
- Keep the image exact while dropping the file size
- Standardise old assets on a modern lossless format
Before you convert
Nothing is lost
Both formats are lossless, so the pixels are identical. This is pure compression — one of the few conversions with no trade-off at all.
Expect a dramatic size drop
Screenshots and flat graphics often compress by 80% or more going from BMP to PNG, because BMP was storing every pixel individually.
What happens to your file
PNG output is lossless, then run through a size optimizer: pngquant is used when it is available on the worker, with Pillow's own quantizer as the fallback. Drop the quality setting below 80 (or switch on Optimize) and the palette is reduced up front instead.
Settings this conversion runs with
| Engine | Pillow (Python Imaging Library) |
|---|---|
| Compression | Lossless |
| Optimizer | pngquant when available, Pillow quantize as fallback |
What changes
- Nothing in the picture is resampled unless you ask for it — resize, crop-to-aspect, and background removal are opt-in, so a plain BMP to PNG keeps the original pixel dimensions.
About BMP and PNG files
BMP image
Strengths
- no compression artifacts
- simple format
Limitations
- very large files
- rarely used on the web
PNG image
Strengths
- transparent backgrounds
- sharp text and lines
- lossless quality
Limitations
- larger files than JPG for photos
- no animation
BMP vs PNG
| Format | BMP | PNG |
|---|---|---|
| Compression | None | Lossless |
| Transparency | No | Yes |
| Best for | uncompressed raster images, legacy Windows graphics | screenshots, logos and icons |
Related tools
Frequently asked questions
- What happens to the image when you convert BMP to PNG?
- PNG output is lossless, then run through a size optimizer: pngquant is used when it is available on the worker, with Pillow's own quantizer as the fallback. Drop the quality setting below 80 (or switch on Optimize) and the palette is reduced up front instead.
- What should you know before converting BMP to PNG?
- Nothing in the picture is resampled unless you ask for it — resize, crop-to-aspect, and background removal are opt-in, so a plain BMP to PNG keeps the original pixel dimensions.
- Is this BMP to PNG converter free?
- Yes. You can convert BMP to PNG online for free, with no account and no watermark.
- Do I need to install software or sign up?
- No. Use the converter from your browser without installing software or creating an account. Files are uploaded to our servers for processing.
- Are my files safe?
- Yes. Files are processed only to complete the conversion and are auto-deleted after 2 hours. We never share them.
- Can I convert multiple BMP files at once?
- Yes. Drop several files to convert them in a batch and download the results as a single ZIP.