Convert BMP to WebP
Free online converter for BMP files. Modern web format, roughly 30% smaller than JPEG. Nothing to install, no watermark, and every file is deleted automatically.
Drag and drop your files
or
Upload a BMP file to convert it to WebP. Up to 3 files at once, 100 MB each.
Free · up to 3 files · 100 MB each · files deleted automatically after 1 hour.
About BMP and WEBP
BMP .bmp
Microsoft's plain bitmap. It generally stores pixels with no compression at all, which makes it simple to read and very large on disk.
Good for
- Dead simple — every pixel stored literally
- No compression artefacts of any kind
- Reliably readable by old Windows software
Trade-offs
- Enormous files, often ten times a PNG of the same image
- Effectively unusable on the web
- Transparency support is inconsistent between readers
image/bmp
WebP .webp
Google's image format, designed to replace both JPEG and PNG. It can compress either way — lossy for photographs, lossless for graphics — and supports transparency and animation in both modes.
Good for
- Typically 25–35% smaller than JPEG at comparable quality
- Transparency in lossy mode, which JPEG cannot do at all
- One format covers photographs, graphics and short animations
Trade-offs
- Older software and some print workflows still will not open it
- Lossy WebP discards detail just as JPEG does
- Editing tools support it less consistently than PNG or JPEG
image/webp
BMP and WEBP side by side
| BMP | WEBP | |
|---|---|---|
| Compression | Uncompressed | Lossy or lossless |
| Transparency | Limited — 32-bit variants only | Yes |
| Animation | No | Yes |
| Typically used for | Legacy Windows software, intermediate working files | Web images where size matters |
What changes when you convert BMP to WEBP
You choose how much to keep
WEBP can compress either lossily or losslessly, so the quality setting decides the outcome rather than the format. High quality stays close to the BMP you started with; lower settings trade visible detail for a much smaller file.
How the WEBP is written
Our default is quality 82, with the encoder choosing colour subsampling per image rather than applying it blindly. The quality control on the converter moves this if you need to — the default aims to be indistinguishable from the source at a sensible file size, rather than to win a compression benchmark.
Expect a dramatic drop in size
A BMP stores every pixel literally, with no compression at all — which is why they are so large. WEBP compresses, so the same image commonly lands somewhere between a tenth and a half of the size it started at. Nothing about the picture changes to achieve that: the file was simply storing its pixels in the least efficient way available.
Other BMP conversions
Other ways to get WebP
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