Convert BMP to WebP
Convert BMP to WebP right in your browser — free, private, nothing is uploaded. Smaller files at the same quality, transparency included.
Convert BMP to WebP →Free · Private — runs in your browser, nothing is uploaded
BMP is the old Windows bitmap: raw uncompressed pixels with essentially no size optimization. It opens everywhere on Windows but wastes space — which is usually why people convert it.
WebP is the modern web format: at similar visual quality it produces noticeably smaller files than both JPEG and PNG, and it supports alpha transparency.
Converting BMP to WebP usually cuts file size at the same visual quality — WebP out-compresses BMP on most images — while keeping alpha transparency available.
BMP vs WebP
| BMP | WebP | |
|---|---|---|
| Compression | lossless — nothing discarded | lossy — some detail traded for size |
| Codec / container | uncompressed Windows bitmap | WebP — written lossy here, with a quality knob |
| Typical file size | very large — no compression at all | smallest of the web formats at comparable quality |
| Best for | legacy Windows software and raw exports | modern web images — photos and graphics alike |
| Strength | dead simple and lossless | smaller than JPEG/PNG at similar quality, with transparency |
| Watch out for | uncompressed — enormous files for what they show | a few older apps and viewers still don't open it |
| Compatibility | universal on Windows; most other platforms too | all modern browsers; some older desktop software lags |
| Transparency | effectively none in common BMP files | yes — alpha supported |
| Animation | no | possible in WebP, but this converter writes still images |
How the conversion works
- Choose your BMP image. The button above opens the converter with WebP already selected as the target format.
- Set the quality from 1 to 100 (default 85) — higher keeps more detail, lower shrinks the file.
- Run the conversion and download the WebP image. Everything happens locally — ffmpeg compiled to WebAssembly runs in your browser tab, your image is never uploaded, and the page keeps working offline once it has loaded.
What to expect
This step is lossy. WebP discards some detail to hit its file sizes — at the default quality of 85 that's hard to see on photos, but sharp-edged graphics and text show artifacts sooner. Raise the quality toward 100 for critical images, and keep the BMP original in case you need to re-export.
FAQ
How much quality do I lose converting BMP to WebP?
At the default quality of 85 the difference is hard to spot on photos. Graphics with sharp edges and text show lossy artifacts sooner — try quality 90+ there, or stick with a lossless format. Your BMP original is untouched either way.
How much smaller will the WebP be than my BMP?
Usually dramatically smaller: BMP files carry little to no compression, while WebP at the default quality of 85 compresses photographic content to a small fraction of that.
Is my BMP image uploaded when converting to WebP?
No. The conversion runs entirely in your browser with ffmpeg compiled to WebAssembly — your image never leaves your device, and the page keeps working offline once it has loaded.