[← Free tools](https://tryflowdrive.com/tools) # MP4 to WebM converter

 Convert MP4 (the universal H.264 video format) into WebM, which smaller files tuned for fast web playback. Everything happens locally in your browser — no uploads, no servers, and no waiting in a queue.

  100% private — your file is processed locally and never leaves your device.

  Drag & drop your video here

 or click to browse — MP4, MOV, MKV, AVI, WebM up to 2 GB

 FAQ ## MP4 to WebM — common questions

 ### Is the MP4 to WebM converter free?

 Yes — it's completely free, with no sign-up, no watermark, and no limit on how many files you convert.

### Are my MP4 files uploaded to a server?

 No. The conversion runs entirely in your browser, so your MP4 file never leaves your device and is never uploaded.

### How do I convert MP4 to WebM?

 Drop your MP4 file into the tool above, then click the convert button. The WebM file is generated locally and ready to download in moments.

### Will I lose quality converting MP4 to WebM?

 Quality is preserved as closely as the WebM format allows. For most web video the result is visually identical to the source.

### Does this work on mobile?

 Yes — it runs in any modern browser on desktop or mobile, with nothing to install.

 Related ## Other conversions

 [MOV → WebM](https://tryflowdrive.com/tools/mov-to-webm)[MKV → WebM](https://tryflowdrive.com/tools/mkv-to-webm)[MP4 → MOV](https://tryflowdrive.com/tools/mp4-to-mov)[MP4 → AVI](https://tryflowdrive.com/tools/mp4-to-avi)[MP4 → GIF](https://tryflowdrive.com/tools/mp4-to-gif)[MP4 → MP3](https://tryflowdrive.com/tools/mp4-to-mp3)

 [See all free tools →](https://tryflowdrive.com/tools)