Browser edition: files stay on your device. Up to 100 MB total and 10 minutes. First use downloads a 32 MB engine. Some formats depend on codec support. Public-link downloading is not ready on this free deployment.
Convert MKV to AVI
Convert MKV to AVI online for free. Smart remux when possible, high-quality encoding when not.
How to convert MKV to AVI
- Add your fileDrop it on the page, choose it from your device, or paste it with Ctrl+V.
- ConvertAdjust settings if you like, then press the button. You'll see live progress.
- Browser processing uses original files on your device. Public-link downloading is unavailable.
What happens to your file
MKV files are common for archiving movies, OBS recordings, multi-language video, but not every app or device opens them. AVI is the better choice for old DVD players, legacy software, archived home videos. Spool converts MKV to AVI with FFmpeg — real decoding and encoding, not a renamed file extension.
A real re-encode. MKV usually contains almost any video codec (H.264, HEVC, VP9, AV1) with any audio codec, which AVI players can't decode, so Spool re-encodes to MPEG-4 Part 2 (Xvid-compatible) video and MP3 audio. "Balanced" is visually indistinguishable from the source for most videos; "High" uses a lower CRF for archiving; "Smaller file" trades a little sharpness for a much smaller file.
Settings
- Quality — High, Balanced, Smaller file. Balanced keeps the original streams when possible (no quality loss, very fast).
- Resolution — Same as source, 4K (2160p), 1440p, 1080p, 720p, 480p, 360p, 240p
- Audio bitrate — Auto · keep original if possible, 320 kbps · best, 256 kbps, 192 kbps · standard, 128 kbps · small, 96 kbps, 64 kbps · voice
MKV vs AVI
| MKV | AVI | |
|---|---|---|
| Full name | Matroska Video | Audio Video Interleave |
| Created by | Matroska.org (open standard), 2002 | Microsoft, 1992 |
| Type | Video container | Video container |
| Typical contents | almost any video codec (H.264, HEVC, VP9, AV1) with any audio codec | MPEG-4 Part 2 (Xvid/DivX) video with MP3 audio |
| Best for | archiving movies, OBS recordings, multi-language video | old DVD players, legacy software, archived home videos |
| Strength | Holds multiple audio and subtitle tracks | Plays on old DVD/USB players and legacy Windows software |
| Weakness | Not supported by iPhone, many smart TVs, Premiere and most social networks | Large files compared with MP4 |
About MKV
- Type
- Matroska Video
- Contains
- almost any video codec (H.264, HEVC, VP9, AV1) with any audio codec
- Use
- archiving movies, OBS recordings, multi-language video
About AVI
- Type
- Audio Video Interleave
- Contains
- MPEG-4 Part 2 (Xvid/DivX) video with MP3 audio
- Use
- old DVD players, legacy software, archived home videos
FAQ
Will converting MKV to AVI reduce quality?
A small amount, because the video has to be re-encoded. With the default "Balanced" setting (H.264 CRF 23) the difference is not visible for most videos; choose "High" to minimize it.
How long does it take?
Re-encoding runs at roughly real-time or faster for 1080p video. You'll see live progress and the time remaining.
Can I convert several MKV files at once?
Yes. Drop up to 10 files at a time — each one is converted in parallel and you can download them individually or all at once.
Is there a file size limit?
Convert and edit files on your device. The browser edition accepts up to 100 MB total, media up to 10 minutes and video up to 4K. Codec availability and device memory can limit individual jobs.
Is this MKV to AVI converter free and safe?
Yes. There are no pop-ups, redirects or fake download buttons, and no software to install. Files are transferred over HTTPS, processed in isolated job folders and deleted automatically.