An open, royalty-free video container built on Matroska/EBML.
| 0x00000000 | 1A45DFA3 | ·E·· | EBML header |
The EBML DocType string near the start reads 'webm' (vs 'matroska' for MKV).
WebM is the royalty-free web video container designed for HTML5 <video>, pairing VP8/VP9/AV1 video with Opus or Vorbis audio. It is an EBML file whose DocType element declares 'webm'.
Have a file that might be WebM? Identify it with the File Type Identifier — it reads the magic number locally, nothing is uploaded. Or browse all formats.