AVI, Windows’ classic video
AVI is a 1990s Microsoft video format, common in old cameras and old files.
Strengths: Classic desktop players open it.
Limits: Browsers and phones do not play it, and it is usually large; here it is read with ffmpeg.
Video
Convert AVI to WebM
Turn your AVI files into WebM in seconds. Everything happens in your browser: nothing is uploaded to any server.
AVIWebM
Drag your files here
Or paste them with Ctrl+V. They never leave your device.
Why convert AVI to WebM?
Browsers and phones do not play it, and it is usually large; here it is read with ffmpeg. As WebM (VP9) it is lighter and plays directly in browsers.
About the formats
WebM, the open web video
WebM is an open, patent-free video format made for the web; here it comes out with VP9 video and Opus audio.
Strengths: It compresses very well and plays directly in Chrome, Firefox, Edge and recent Safari.
Limits: Editing programs, TVs and old phones often cannot open it.
How to convert AVI to WebM
- 1Drop your AVI files in the box, paste them or pick them from your device.
- 2Check that the target is WebM and open the options if you want to adjust it.
- 3Press “Convert” and download each WebM, or all of them in a ZIP.
Frequently asked questions
Is my AVI uploaded to a server to turn it into WebM?
No. The AVI to WebM conversion runs entirely in your browser, with code downloaded from this site and executed on your device. You can check it in the Network tab of the developer tools or by going offline after the page loads.
How long does AVI to WebM take?
It depends on the length, the resolution and your computer. The browser’s hardware acceleration is used when available, and you get an estimate before it starts.
Is there a size limit?
Up to 2 GB and 3 hours of video on desktop; on mobile, 500 MB and 30 minutes (AVI: 1 GB and 1 hour on desktop). If it is over, you are told before it starts and can trim it.
Can I convert several AVI files at once?
Yes. Drop as many AVI files as you like: several are converted at the same time, depending on your processor cores, and when they finish you can download each WebM or all of them in a ZIP.