WebM is the open video format of the web: browser screen recorders, many downloads and some meeting tools save it. Plenty of software still won't open it, including older iPhones, PowerPoint, Premiere on some setups and many TVs. Converting re-encodes its VP9 picture and Opus sound into H.264 and AAC, the MP4 combination everything plays.
When to use this
Typical WebM to MP4 needs: a browser or Loom recording that has to go into PowerPoint or Keynote, a clip for an iPhone user, footage for an editor that rejects WebM, or a recording for a platform that only accepts MP4 uploads.
Frequently Asked Questions
Why does WebM to MP4 take longer than MOV to MP4?
WebM uses VP9 or AV1 video, which MP4 players don't widely support, so the picture has to be re-encoded to H.264. That takes about as long as the video plays, or less on a recent computer.
Will the quality drop?
Re-encoding at the high quality setting used here is visually very close to the original. The file may grow a little, since H.264 is less efficient than VP9.
Does it work for screen recordings?
Yes. Chrome and Firefox recorders, OBS and many browser extensions save WebM, and all of them convert to MP4 here.
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