Convert BMP and bitmap images to WebP directly in your browser. Smaller than PNG with full transparency support, the recommended format for modern websites.
Last updated: August 2026
Smaller
Than PNG
Full
Transparency
Batch
Multiple Files
Private
No Uploads
Drop BMP files here or click to browse
Supports .bmp and .dib, all processing stays in your browser
Drop or select your BMP file
One file or many, .bmp or .dib. Nothing is uploaded.
Set the WebP quality
Defaults to 85. Set it before adding files, already-added files keep their quality.
Conversion starts automatically
Each file decodes and re-encodes as WebP the moment it's added.
Download your WebP
One file downloads directly, two or more can download together as a ZIP.
WebP is the best general purpose target when a BMP image is headed for a website rather than print or further editing.
Screenshots and UI graphics for the web
BMP screenshots converted to WebP load far faster and take up much less storage on a website.
Legacy icons and graphics with transparency
32-bit BMP files with an alpha channel convert cleanly to WebP, keeping transparency at a smaller file size.
Old bitmap archives published online
Publishing a folder of old BMP files becomes far more practical once each one is converted to WebP.
Improving Core Web Vitals
Replacing large BMP or PNG files with WebP directly reduces page weight and supports better Largest Contentful Paint scores.
Adjusting quality after files are already added
The quality slider only applies to files added after you move it. If you want a different quality on a file that's already converting, remove it and drop it in again once the slider is set.
Assuming every 32-bit BMP has real transparency
The 32-bit BMP format reserves a byte per pixel for alpha, but not every program that writes 32-bit BMPs stores genuine transparency there. If the output looks fully opaque, the source BMP likely never had real alpha data.
Assuming every BMP variant will decode
Standard uncompressed 24-bit or 32-bit Windows BMP, the kind MS Paint and screenshot tools produce, decodes reliably. RLE-compressed BMPs and old OS/2-style headers are less consistently supported across browsers. If a file fails to decode, that's the most likely reason.
Trying to drop a non-BMP file
This tool only accepts .bmp and .dib files. Other formats need a different converter on this site first.
WebP combines the benefits of both older formats. It supports transparency like PNG while producing significantly smaller files than an uncompressed BMP, and it offers better compression than JPEG at equivalent visual quality. For a BMP image headed for a website, WebP is usually the best balance of quality, transparency support and file size.
Yes. WebP is supported by every major modern browser, including Chrome, Firefox, Safari and Edge. It is considered a safe default format for web images in 2026, recommended by Google's PageSpeed Insights as a next-generation alternative to JPEG and PNG.
85, the default, is a good balance for most images. The slider runs from 60 to 95. Lower toward 70 to 75 for the smallest files when serving web images, or raise toward 90 to 95 when preserving fine detail matters more than file size.
No. Quality is applied at the moment a file starts converting, which happens as soon as it's added. Changing the slider only affects files added after that point. To apply a different quality to a file already in the list, remove it and drop it in again after adjusting the slider.
If your source BMP includes real alpha channel data, most commonly in 32-bit BMP files, it is preserved through the conversion. WebP supports full transparency, similar to PNG, while producing smaller files. Note that not every 32-bit BMP actually carries genuine transparency, some programs pad that extra byte without a meaningful alpha mask, in which case there's nothing real to preserve.
BMP files virtually never carry EXIF metadata in the first place, it isn't a format feature BMP typically supports the way JPEG does. So there's generally nothing to strip. The conversion still decodes to raw pixels and re-encodes as WebP, so even in the rare case extra data was embedded, it would not carry over.
Yes. Drop or select several BMP files and each converts independently. With a single finished file, the download button saves it directly. Once two or more files finish, you get the option to download them all together as one ZIP archive.
No. Both the decoding and the WebP encoding happen entirely in your browser. Your file never leaves your device at any point during the conversion.
No sign-up. No upload to server. Drop your BMP file above and download the WebP in seconds.
