What is WebM?
WebM is an open video format for the web, using VP8 or VP9 video and Opus audio.
WebM is a good fit for websites that avoid patent-encumbered codecs. For sharing with others, MP4 is usually the safer choice.
File extensions: .webmMIME types: video/webm
Advantages
- Open and royalty free
- Good compression with VP9
- Great for web playback
Disadvantages
- Poor support in Apple devices and editors
- Slow to encode in software
- Not accepted by many platforms
Typical uses
- Web video
- Screen recordings from browsers
- Open-source projects
Compatibility
Chrome, Edge and Firefox play WebM; Safari and many TVs and editors have limited support.
Convert WebM to another format
Convert to WebM from another format
Frequently asked questions
Are my files uploaded to a server?
No. The conversion runs entirely in your browser with local code. Your files never leave your device, and there is no upload.
Is there a file size limit?
There is no limit on our side, but your browser memory is. Images work for very large files; for videos, files above a few hundred megabytes can fail on devices with little memory.
Will the quality suffer?
That depends on the target format and settings. Use the quality option to balance size and detail; lossless targets keep everything the source contained.
Which browsers are supported?
Current versions of Chrome, Edge, Firefox and Safari. Fast hardware paths are used where available, with a compatible fallback otherwise.