Convert MP4 to WebM
Convert MP4 files to WebM for free, right in your browser. No upload, no sign-up, no watermark — your files never leave your device.
Drop MP4 files here
or click to choose
MP4 to WebM, privately
Everything runs on your device with WebAssembly — your MP4 files are never uploaded to a server.
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How to convert MP4 to WebM
Add your MP4
Drop your MP4 file in — nothing is uploaded, it all stays on your device.
Convert
The file is converted to WebM right in your browser, in seconds.
Download
Grab your new WebM file — ready to use anywhere.
Why convert MP4 to WebM here
100% private
Your MP4 files are converted in the browser and never uploaded anywhere.
Fast & free
Conversion runs on your device in seconds — no accounts, no limits.
No watermark
Your WebM comes out clean, never stamped with a watermark.
Works everywhere
Runs in any modern browser on desktop or mobile — nothing to install.