BMP vs PNG: uncompressed bitmap or lossless PNG?
BMP stores raw pixels with little or no compression, so files balloon. PNG compresses losslessly and supports transparency while staying sharp.
| BMP | PNG | |
|---|---|---|
| Compression | None or minimal | Lossless |
| Transparency | No | Yes |
| File size | Very large | Much smaller than BMP |
| Best for | Legacy pipelines | Web, editing, archives |
Verdict
Convert BMP to PNG almost always — you keep quality and shed megabytes. Keep BMP only when a tool explicitly demands it.