Convert AVI to WebM
Last updated: June 1, 2026To convert AVI to WebM, drop your AVI file into the converter above, then download the WebM result. It's free, needs no sign-up, and there's no watermark. Conversion runs in your browser with on-device FFmpeg, so your files never leave your device.
Why convert AVI to WebM?
Convert AVI to WebM right here in your browser — your video is processed on your own device with FFmpeg compiled to WebAssembly and never uploaded to a server. AVI is a bulky, older Microsoft container (often DivX, Xvid, or even uncompressed); WebM wraps efficient VP9 video into an open, royalty-free format built for the web. The result is a much smaller file that streams cleanly through the HTML5 video tag, with no sign-up, no watermark, and no upload limits.
- Self-hosting an old AVI clip on a website so it plays inline via the HTML5 <video> tag.
- Shrinking a large DivX or Xvid AVI for faster page loads and lighter storage.
- Replacing AVI on a site that needs an open, royalty-free format for Chrome, Firefox and Android.
AVI vs WebM
AVI · Audio Video Interleave
AVI is an older Microsoft container. It's widely readable on desktops but produces large files and lacks modern features like streaming-friendly fast-start, so it's usually converted to MP4.
WebM · WebM (VP9)
WebM is an open, royalty-free format designed for the web. VP9 video gives smaller files than H.264 at similar quality and is ideal for embedding directly on a site.
Need more options?
Video Converter
Convert video to MP4, WebM, MOV, MKV, GIF or MP3.
Open Video ConverterAVI to WebM — frequently asked questions
Is converting AVI to WebM lossy?
Yes. WebM here uses VP9, a lossy codec, so the file is re-encoded rather than copied. In practice WebM is often 40-70% smaller than the AVI original at similar perceived quality, but it's a fresh encode — keep your AVI if you need a pristine master for editing.
Will a WebM file play everywhere?
WebM plays natively in Chrome, Firefox, Edge and Android, which makes it ideal for the web. Safari and older desktop players support it less reliably, and most video editors and social apps prefer MP4. If you need maximum device compatibility, convert AVI to MP4 instead.
Is there a file size limit since it runs in my browser?
There's no server limit because nothing is uploaded — the only constraint is your device's memory. Short and medium clips convert comfortably; very large or long AVI files use more RAM and take longer, so a desktop browser handles them best.
How do I convert AVI to WebM?
Drop your AVI file (or several) into the converter, confirm WebM is selected as the output, click convert, then download the WebM file. The whole thing takes a few seconds.
Is this AVI to WebM converter free?
Yes — it's completely free with no watermark and no sign-up required.
Is it safe to convert AVI to WebM here?
Yes. Conversion runs on-device with FFmpeg compiled to WebAssembly, so your AVI file is never uploaded to a server.
Can I convert multiple AVI files at once?
Convert one AVI file at a time — finish one, then drop in the next.
Does it work on mobile?
Yes — the converter runs in any modern browser on phones, tablets and desktops.