Format guide
WebM
WebM
WebM is Google's open-source video container, designed for web streaming. Uses VP8/VP9 video and Vorbis/Opus audio. About 25-35% smaller than equivalent H.264 MP4 at the same quality. Universal browser support; less common on standalone media players and older hardware.
How to open a WebM file
All modern web browsers, VLC, MPV. Some smart TVs and older players don't recognize WebM, converting to MP4 is the standard fix.
Primary use
Web video where smaller file size matters more than universal playback.
Convert WebM to other formats
Looking for something else? Browse the full list of 192 converters.