How to use it
- Drop your BMP files here.
- Click Convert.
- Download the PNG, or a ZIP when you converted several files.
Same pixels, smaller file
BMP and PNG are both lossless: every pixel keeps its exact color. The difference is storage. Most BMP files are uncompressed, while PNG compresses without throwing anything away. Screenshots, app windows, diagrams and pixel art with large flat areas often end up at a small fraction of the BMP size.
This converter also optimizes the PNG losslessly with OxiPNG, so you get a lean file with zero quality change. If a 32-bit BMP contains transparency, the PNG generally keeps it. Everything runs in your browser; your images are not uploaded.
PNG or JPG?
| Image type | Best target | Why |
|---|---|---|
| Screenshot, software UI | PNG | crisp text, no smudging |
| Pixel art, icons, charts | PNG | exact colors, small file |
| Photo, scanned picture | JPG | much smaller file |
For photos, PNG is smaller than BMP but still large. If you plan to email or upload photos, BMP to JPG gives a much smaller file. You can convert many bitmaps at once; several results download as one ZIP, and each file can also be saved separately.
Frequently asked questions
Does BMP to PNG lose quality?
No. Both formats are lossless, so the PNG matches the bitmap pixel for pixel.
Why is the PNG so much smaller?
BMP usually stores raw pixels with no compression. PNG compresses losslessly, which works especially well on flat colors.
Is transparency preserved?
If the BMP has an alpha channel, the PNG generally keeps it. Most BMP files have no transparency, though.
Last updated: November 13, 2026