WebM converters

WebM is an open video format made by Google for the web in 2010. The picture is compressed with VP8, VP9 or AV1 and the sound with Opus or Vorbis. Browser screen recorders, Chrome's MediaRecorder, many downloaded web videos and some messaging apps save WebM, but iPhones, older Windows programs, video editors and social networks often do not accept it.

Convert WebM

• WebM → MP4WebM to MP4 converter

What to know about WebM

• WebM is based on the Matroska (MKV) container, limited to web-friendly codecs.
• VP9 makes files about as small as H.265 and is what YouTube streams in most browsers.
• Safari plays WebM since version 14.1 (2021), but many Apple apps still refuse it.
• A WebM file can also hold only sound, usually Opus: voice messages in some apps are audio-only WebM.

File extensions: .webm