What is a WebM file?
WebM is an open video format created for the web. Browser-based screen recorders and many websites use it. It plays in modern browsers but many editors, phones and upload forms prefer MP4.
| Full name | WebM (VP8/VP9/AV1 video, Vorbis/Opus audio) |
|---|---|
| File extensions | .webm |
| MIME type | video/webm |
| Introduced | 2010 |
| Compression | Lossy |
| Typical file size | Small; similar to MP4 |
| Best for | video on websites and browser screen recordings |
| Compatibility | Chrome, Firefox, Edge and Android; limited in iPhone apps, video editors and social networks |
How to open a WebM file
Windows
Plays in Chrome, Edge, Firefox and VLC.
Mac
Plays in Chrome, Firefox and Safari 14.1+; QuickTime can't open it.
iPhone and iPad
Plays in Safari on iOS 15+; other apps may not.
Android
Plays in Chrome and most video apps.
If none of these work, convert the file to a more widely supported format with one of the tools below.
Convert WebM files
Other tools for WebM files
Frequently asked questions
What is a WebM file?
WebM is an open video format created for the web. Browser-based screen recorders and many websites use it.
How do I open a WebM file on Windows?
Plays in Chrome, Edge, Firefox and VLC.
How do I open a WebM file on a Mac?
Plays in Chrome, Firefox and Safari 14.1+; QuickTime can't open it.
Is WebM lossy or lossless?
WebM uses lossy compression, so some detail is discarded each time the file is saved.
How do I convert WebM to another format?
Use one of the free converters on this page, for example WebM to MP3. Files are converted in your browser without being uploaded.