WebM to AVI Converter
Convert WebM to AVI free — no upload, no signup
To convert WebM to AVI, drop your WebM video into the box below and click Convert. Fylo converts with ffmpeg running inside your browser, so nothing is uploaded and there's no signup or watermark. Convert WebM to AVI for legacy players and software.
Drop videos here
or tap to browse · paste with Ctrl+V · add many at once
Your files never leave your device
If the video already uses codecs that fit the new format, Fylo repackages it instantly with no quality loss.
Advanced
How to convert WebM to AVI
Add your WebM videos
Drag and drop WebM files into the box or tap to choose them. The converter engine (about 31 MB) downloads once, the first time you convert.
Choose quality (optional)
Balanced quality suits most videos. If the codecs already fit AVI, Fylo repackages the file instead of re-encoding it, with no quality loss.
Convert and download
Click Convert, then download each AVI file or all of them as one ZIP.
Why convert WebM to AVI?
Old DVD players and Windows programs that only read AVI can't open WebM files.
What happens when you convert WebM to AVI?
The video is re-encoded to Xvid-compatible MPEG-4 and the audio to MP3. AVI files are usually larger than the WebM source.
How does Fylo convert WebM to AVI?
Fylo reads the WebM with ffmpeg compiled to WebAssembly and writes MPEG-4 Part 2 tagged as Xvid with MP3 audio — the combination old DVD players and TVs understand. WebM's usual codecs (VP8, VP9, AV1) can't go into AVI as-is, so the video is re-encoded. Speed depends on your device: short phone clips take seconds, while on our slow test PC a 2-minute 1080p video took about 10 minutes. Only the first video and audio track are kept, and the original resolution is preserved unless you pick 1080p, 720p or 480p under Advanced.
What's the difference between WebM and AVI?
WebM was announced by Google in 2010 as an open, royalty-free alternative to H.264 for HTML5 video. It's a subset of Matroska restricted to VP8, VP9 or AV1 video and Vorbis or Opus audio. Browser screen recorders and many web tools save WebM by default.
AVI (Audio Video Interleave) was introduced by Microsoft with Video for Windows in 1992. It's based on the RIFF container used by WAV and stores interleaved chunks of audio and video. In the 2000s, AVI files with DivX or Xvid (MPEG-4 Part 2) video and MP3 audio were the standard for downloaded movies.
Learn more: WebM format guide · AVI format guide
| Property | WebM | AVI |
|---|---|---|
| Developed by | Microsoft | |
| Introduced | 2010 | 1992 |
| Typical video codecs | VP8, VP9, AV1 | MPEG-4 Part 2 (Xvid/DivX), MJPEG |
| Typical audio codecs | Vorbis, Opus | MP3, PCM, AC-3 |
| Plays in web browsers | Yes — Chrome, Edge, Firefox, Safari 14.1+ | No |
| Compatibility | Browsers, Android; limited in editors and on iPhone apps | Windows, VLC, older DVD players and TVs |
| Best for | Royalty-free web video, screen recordings | Legacy players, old Windows software |
Frequently asked questions
Why is the AVI bigger?
VP9 is far more efficient than the Xvid codec used for AVI compatibility.
Can I lower the resolution?
Yes, under Advanced.
Is my WebM file uploaded to a server?
No. Fylo runs ffmpeg, the same engine used by professional video tools, compiled to WebAssembly inside your browser. Your WebM file is read directly from your device and never sent anywhere.
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