ENFR

MP4 vs WebM

Choose MP4 for sharing video with anyone, anywhere. Choose WebM for video embedded in web pages. Both compress the same way; the difference is compatibility and ecosystem.

MP4WebM
CompressionLossyLossy
Metadata✓-
Open / royalty-free-✓
Defined byMPEG / ISOGoogle
Since20012010
Best forsharing video with anyone, anywherevideo embedded in web pages

MP4

H.264 video and AAC audio. Plays on absolutely everything.

WebM

Open VP9/Opus format built for the web. Smaller than MP4 at equal quality.

Questions

MP4 or WebM: which is smaller?

It depends on the content; see our measured benchmarks on the conversion pages.

Can I convert MP4 to WebM?

Yes, in your browser, nothing uploaded.

And WebM to MP4?

Yes, as well.