Convert BMP to WEBP
Quietly. In your browser. No upload.
Drop your .bmp file
or click to browse · max 50MB
or paste with ⌘V
Converting BMP to WebP is the most efficient path from old-school Windows bitmap to modern web image. BMP is uncompressed, so even a screen-sized image is several megabytes; WebP at quality 90 typically takes that down to a few hundred kilobytes without visible quality loss. It's a clean modernization if your delivery target is anywhere on the modern web.
When you'd use it
Modernize legacy assets for a website
You've got a folder of BMPs from an older project or a Windows desktop app. Converting them to WebP cuts disk weight by 90%+ and brings them into the format modern browsers handle most efficiently.
Replace BMPs in CMS templates
Some older content management systems let users upload BMPs without converting. Replacing them with WebP gives much faster page loads with no visible difference.
Optimize game or app assets
Older game engines and desktop apps often stored UI sprites as BMPs. WebP is dramatically smaller and supports transparency, making it a near-strict upgrade for asset bundles targeting modern platforms.
How it works
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Your file never leaves the browser.
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Conversion runs locally via WebAssembly and Canvas.
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Download. No account, no history.
Technical notes
BMP is decoded by the browser's native image pipeline and re-encoded as WebP at the quality you've set. WebP supports both lossy and lossless modes; this converter produces lossy WebP via Canvas's toBlob. At quality 90+ the result is visually indistinguishable from the BMP for typical content. Transparency in 32-bit BMPs is preserved. Browser support for WebP is now near-universal — Safari joined in 2020 — but check your delivery target if you might hand the file to very old software.
Frequently asked
What happens to my BMP files?
Nothing leaves your browser. The conversion runs locally on your device using WebAssembly and the Canvas API. No file is uploaded to a server — including ours.
Is the converted WEBP identical to the original?
WEBP is a lossy format. The output is visually very close to the original at quality 90+ and considerably smaller. Use the quality slider above to trade size for fidelity.
Is there a file size limit?
There is no hard cap, but very large files (hundreds of MB) may be slow on older devices because everything happens in your browser's memory.
Do you collect data on my file or my use?
Your file is invisible to us — it never leaves your browser. For aggregate page-view counts we use Cloudflare's server-side edge logs (no JavaScript beacon runs in your browser). We display Google AdSense ads on conversion result pages; the AdSense script loads on every page and may set advertising cookies after you accept the consent banner (Google Consent Mode v2 asks first). The ads see the page URL and standard browsing signals — they never see your file, because the file never leaves your device.
How much smaller will the WebP be?
For a typical screen-sized 24-bit BMP, expect a 90–98% reduction. A 12 MB BMP becomes a 200–500 KB WebP at quality 90 with no visible quality loss.
Should I use JPG instead?
JPG is more universally compatible but doesn't support transparency and produces files about 30% larger than WebP at the same visual quality. WebP is the better choice for modern web delivery; JPG is the safer choice for compatibility with very old apps.