Convert GIF to WebM
The web's own video format — open codecs, small files, made for embedding where a heavyweight GIF would drag the page down.
Drop your video or audio here
or
MP4, MOV, WebM, MKV, AVI, MP3, WAV and more — any size, no upload
🔒 Files never leave your device — everything runs in your browser.
WebM is the video format the web standardized on for itself: open, royalty-free codecs (VP8/VP9) that every modern browser plays with a plain <video> tag. Re-encoding an animated GIF as WebM typically cuts the file by well over half, because video compression stores only what changes between frames — GIF re-draws every frame from scratch.
The conversion runs entirely on your device. If your GIF lives in a README, a blog post, or anywhere page weight matters, WebM is the polite replacement: same loop, a fraction of the bytes, and the browser treats it as what it really is — a video.
How it works
- Drop your file
Any common format, any size. Nothing is uploaded — the tool runs in your browser.
- Convert
Compatible files are repackaged instantly with zero quality loss; others are hardware-transcoded at high quality.
- Download
Your converted file is ready on your device — nothing to wait for, nothing to delete from a server.
Frequently asked questions
How much smaller will the WebM be?
Cuts of 60–80% are typical for animation GIFs. If absolute smallest is the goal, try MP4 too — its encoder here usually squeezes a little further, and MP4 plays in more non-browser places. WebM wins when you want open codecs or web embedding.
Is GIF transparency kept?
No — the output uses standard opaque video color (yuv420p), so transparent GIF regions become solid. WebM as a format can carry transparency, but browser-side encoding of it is unreliable, so this tool trades alpha away for a conversion that always works.
Will the WebM play everywhere?
Every modern browser plays WebM, including Safari on current macOS and iOS versions. Outside browsers — older smart TVs, some editing apps, message previews — MP4 is still the safer bet; that is the main reason to pick one over the other.
Is my file uploaded to a server?
No. ConvertUno runs entirely in your browser on your own device. Your file never leaves your computer or phone — there is no upload at all.
Is it really free, with no watermark?
Yes. Processing happens on your device, so serving you costs us almost nothing — no watermark, no account, no file-size limit, no daily quota.