Convert WebM video to MP4
Re-encode a WebM clip as H.264 MP4 in your browser, preserve supported sound and download a file for your destination app.
- Free, no account needed
- 5 output formats
- Up to 10 files
- No media uploads
WebM to MP4: what’s different
A WebM screen recording or web clip may need an MP4 copy for another app. Conversion re-encodes video and audio, so review the resulting picture and sound.
Processing happens on your device. The sample includes a labelled synthetic tone so audio conversion can be tried immediately.
What works
- Keep the original WebM for future edits.
- Check the destination app’s dimensions and file-size requirements.
- Use the compressor for a deliberate target-size export.
How to use it
- 1.Choose video or audio files, or try the sample with sound.
- 2.Select an output format and audio bitrate where applicable.
- 3.Convert, preview each completed file and download individually or as a ZIP.
Questions
Are files uploaded?
No. Media conversion happens in this browser.
What if the source has no audio?
Audio extraction reports that the source has no sound. It does not invent a silent audio track.
Will every codec work?
No. The browser must be able to decode the source and encode the selected output. Errors keep your original file available.