WebM to MP4 converter
To convert WebM to MP4, drop your WebM file in the box below. It converts straight away; press Download to save the MP4. It all happens in your browser, so your file stays on your device.
Convert to
What changes
| WebM to MP4 | What happens |
|---|---|
| Picture | VP8 or VP9 re-encoded as H.264 |
| Sound | Opus or Vorbis re-encoded as AAC |
| Size | Same as the original, 1080p, 720p or 480p (never larger) |
| Quality | Smaller file, balanced or best |
| Where it happens | In your browser; the file is never uploaded |
How to convert WebM to MP4
- Add your WebM. Drop the file in the box, or click to choose it. It becomes MP4 straight away.
- Check the result. Look at the preview and the size. The defaults are right for most files.
- Download. Press Download to save the MP4.
WebM is what screen recorders and browsers save. MP4 is what phones, Windows, editors and most upload forms expect.
Questions
WebM holds VP8 or VP9, which MP4 players do not expect, so every frame is encoded again as H.264. Your device does the work; a short clip takes seconds, a long recording a few minutes.
This browser has no H.264 encoder. Chrome, Edge and Safari have one; some Linux and Firefox builds do not.
Yes. Choose 720p or 480p and “Smaller file”, and turn the sound off if you do not need it.
No. The conversion happens right in your browser, so your file stays on your device. There is no account to make, either.