Convert WebM to MP4

MP4 is the format that plays everywhere: phones, messaging apps, older TVs, video editors that never learned VP9. This re-encodes to H.264 where the browser can, and falls back to VP9 inside an MP4 container where it can't. The soundtrack comes across as AAC.

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What is WebM?

Google's royalty-free video container, built for the web and carrying VP8, VP9 or AV1 video with Opus audio. Every modern browser plays it without a plugin or a licence, which is why it's the sensible choice for video you host yourself and a poor one for video you send to someone's phone.

What is MP4?

The container video actually travels in: what phones record, what messaging apps accept, what every player since the iPod era opens. It usually carries H.264 video and AAC audio. Its one structural quirk matters to converters - the index of every frame lives in a table that has to be exactly right, or nothing plays.

Your files never leave your device · no magic required