MKV to AVI Converter
Convert MKV to AVI free — no upload, no signup
To convert MKV to AVI, drop your MKV 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 MKV movies for older DVD and USB players.
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 MKV to AVI
Add your MKV videos
Drag and drop MKV 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 MKV to AVI?
Many older players and TVs read AVI from USB sticks but not MKV. Converting makes your files watchable on that hardware.
What happens when you convert MKV to AVI?
Fylo re-encodes video to Xvid-compatible MPEG-4 and audio to MP3. Expect a larger file than an H.264 MKV and a long conversion for full-length HD movies; choose 720p or 480p under Advanced to speed things up.
How does Fylo convert MKV to AVI?
Fylo reads the MKV 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. MKV's usual codecs (Any: H.264, HEVC, 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 MKV and AVI?
MKV is the Matroska container, an open standard first released in 2002. It can hold virtually any video, audio or subtitle codec, and any number of tracks — so one file can carry several languages, director's commentary and subtitles. WebM is a restricted subset of Matroska.
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: MKV format guide · AVI format guide
| Property | MKV | AVI |
|---|---|---|
| Developed by | Matroska project (open standard) | Microsoft |
| Introduced | 2002 | 1992 |
| Typical video codecs | Any: H.264, HEVC, VP9, AV1… | MPEG-4 Part 2 (Xvid/DivX), MJPEG |
| Typical audio codecs | Any: AAC, Opus, FLAC, DTS, AC-3… | MP3, PCM, AC-3 |
| Plays in web browsers | Partly (Chrome/Edge for some codecs) | No |
| Compatibility | VLC, Plex, Kodi, most smart TVs; not iPhone or many editors | Windows, VLC, older DVD players and TVs |
| Best for | Movies with multiple audio and subtitle tracks | Legacy players, old Windows software |
Frequently asked questions
Will multiple audio tracks be kept?
No, AVI output includes the first audio track only.
Why is it slow?
Full movies must be re-encoded frame by frame on your device. Shorter clips finish much faster.
Is my MKV file uploaded to a server?
No. Fylo runs ffmpeg, the same engine used by professional video tools, compiled to WebAssembly inside your browser. Your MKV file is read directly from your device and never sent anywhere.
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