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WebM Format in ShareX
WebM is an open, royalty-free video format designed for the web. It uses VP8/VP9 video codec and Vorbis/Opus audio, providing excellent compression for online content.
Why Use WebM
- Open format — No patent licensing fees, fully open standard
- Excellent web performance — Designed specifically for web streaming
- Smaller than MP4 — VP9 codec often produces files 20-30% smaller than H.264
- HTML5 native — Plays directly in browsers without plugins
- Transparency support — WebM can include alpha channel for transparent video
ShareX WebM Settings
Configure in Task Settings → Screen Recorder:
- Video codec — VP8 (faster) or VP9 (better compression)
- Audio codec — Vorbis or Opus (Opus recommended for better quality)
- Quality — CRF value; lower = better quality
- Bitrate — Manual bitrate control option
WebM vs MP4
| Feature | MP4 | WebM |
|---|---|---|
| Codec | H.264 | VP8/VP9 |
| File size | Good | Better |
| Compatibility | Universal | Web-focused |
| Licensing | Patent-encumbered | Royalty-free |
| Transparency | No | Yes |
Best Use Cases
- Web embedding — Directly embed video on your website
- Sharing via browser — When the audience will view in a browser
- Animated content — WebM animation as a GIF alternative (much smaller)
- Transparent video — When you need alpha channel in your recording
Official References
Official project links
If you need the original docs, release files or project source code, go directly to the official ShareX resources.