Image
Convert BMP to WebP
Free, private, and instant — your files never leave your device.
BMP stores every pixel as uncompressed raw bytes, making it one of the largest image formats in common use. WebP is one of the smallest: it typically produces files 25–34% smaller than JPEG and up to 90% smaller than uncompressed BMP at equivalent visual quality. WebP also supports full alpha-channel transparency — meaning a 32-bit BMP with transparency can convert to WebP without filling the transparent areas with white. Converting BMP to WebP is the single most impactful step for getting a raw, uncompressed image into a modern, web-ready format in one pass.
BMP
Windows Bitmap
- Lossless compression
- Supports transparency
- Best for: Windows system resources, uncompressed raw pixel exports
WebP
Web Picture format
- Lossy compression
- Supports transparency
- Best for: web images, CMS uploads, app assets
How to Use
- 1
Drop your BMP file — the output format is already set to WebP.
- 2
Adjust the quality slider. 80–85% is a solid web default; use 90%+ for images viewed at large sizes.
- 3
Click "Convert to WebP" — conversion runs in your browser.
- 4
Download the WebP. Expect a file dramatically smaller than the original BMP.
Frequently Asked Questions
How much smaller will the WebP be than the BMP?
Far smaller — typically 80–95% smaller than the uncompressed BMP, since you are going from no compression at all to one of the most efficient lossy algorithms available. The exact ratio depends on image content and quality setting.
Does WebP preserve the transparency found in 32-bit BMP files?
Yes. 32-bit BMPs contain an alpha channel, and WebP supports full alpha transparency. Unlike JPEG, WebP will not fill transparent pixels with white.
Should I use WebP or JPEG for my converted BMP?
WebP for web delivery — it produces smaller files than JPEG at equivalent quality and supports transparency. Use JPEG if you need compatibility with very old software or email clients that may not support WebP.
Can I convert BMP to PNG for lossless quality instead?
Yes — the PNG option is available. PNG compression is lossless (no quality loss at all), while WebP applies lossy compression (controlled by the quality slider). PNG will be larger than WebP but bit-for-bit identical to the original BMP.