What is BMP?
BMP is the classic uncompressed Windows bitmap format. Every pixel is stored as raw data, so quality is perfect but files are huge. BMP is best for old Windows software and some embedded devices. BMP files are many times larger than PNG with exactly the same pixels, and they are poorly supported on the web.
What is PNG?
PNG is a lossless raster format: every pixel is kept exactly, and it supports full transparency (alpha channel). It is the standard for logos, screenshots, icons and graphics with text or sharp edges. PNG is best for logos, screenshots, graphics with text and anything that needs a transparent background.
When should you convert BMP to PNG?
- Old software, a screenshot tool or a device saved images as .bmp.
- You want to share or upload a bitmap that is far too large.
- You need a lossless file that websites and apps accept.
Tips for the best result
PNG is lossless like BMP, so the image is pixel-for-pixel identical — only much smaller. There is nothing to configure: drop the files and download.
BMP vs PNG at a glance
| BMP | PNG | |
|---|---|---|
| Type | Raster | Raster |
| Compression | None | Lossless |
| Transparency | Rarely | Yes (full alpha) |
| Animation | No | No (APNG rarely used) |
| Compatibility | Windows; weak on the web | Universal |
| Best for | Old Windows software and some embedded devices | Logos, screenshots, graphics with text and anything that needs a transparent background |