How to use
- Drop MP4 videos into the box above.
- When the WEBM file is ready, tap Save.
Good to know
WebM is an open format that works well on websites. Re-encoding with VP9 can keep similar quality at a smaller size.
A video format (MP4, MOV, WebM, MKV) is a container; the video and audio codecs inside are separate. When only the container changes (e.g. iPhone MOV to MP4), it finishes in seconds without re-encoding and keeps full quality.
When the codec must change too (e.g. WebM to MP4), the browser’s encoder rebuilds the video, which can take about as long as the video.
FAQ
Does it support AVI or WMV?
MP4, MOV, WebM and MKV are supported for now. Results are saved as widely playable MP4 (H.264) by default, or as WebM in browsers that cannot create MP4.
Is my video uploaded?
No. Videos are processed inside this browser and never sent anywhere. Because your own device does the work, long videos take a while and files over 2 GB may fail on phones.
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