Format comparison
WebM vs MKV
How do WebM and MKVcompare? Here's everything you need to know to choose the right format — and how to convert between them.
.webm
Full guide →Web Media
WebM is Google's open-source video format designed specifically for the web. It offers excellent compression and quality, especially with the VP9 and AV1 codecs, and is royalty-free.
.mkv
Full guide →Matroska Video
MKV is the most flexible video container format available. It can hold virtually any codec and supports unlimited audio tracks, subtitles, and chapters. It's the format of choice for high-quality video enthusiasts.
| Specification | WebM | MKV |
|---|---|---|
| Full name | Web Media | Matroska Video |
| Extension | .webm | .mkv |
| MIME type | video/webm | video/x-matroska |
| Category | Video | Video |
| Developer | Matroska.org | |
| Year introduced | 2010 | 2002 |
WebM advantages
- Royalty-free and open source
- Excellent web browser support
- Great compression with VP9/AV1
- Designed for HTML5 video
WebM limitations
- Limited support outside web browsers
- Fewer editing tools available
- Hardware decoding less common
- Less universal than MP4
MKV advantages
- Supports virtually any codec
- Multiple audio and subtitle tracks
- Chapter support
- Open source and free
MKV limitations
- Not natively supported by all players
- Not ideal for streaming
- Large files at high quality
- No hardware playback on some devices
Which should you use?
WebM and MKV target different use cases. WebM is ideal for html5 web video, while MKV works best for movie collections and media servers.
Best uses for WebM
HTML5 web video
YouTube (internal format)
Web applications
Open-source projects
Best uses for MKV
Movie collections and media servers
Anime with multiple subtitle tracks
Blu-ray rips and backups
Multi-language video distribution
Convert between WebM and MKV
Need to switch formats? Convert for free with SquishConvert.