Convert AVI to MKV
Convert AVI files to MKV locally, completely free and with maximum privacy.
Drag and drop your files here
or click to browse local files (large files supported, limited only by browser RAM)
Upload FilesPlatform Statistics
How to convert AVI to MKV
- Drop your .avi files above, or click Upload Files. You can add many files at once.
- MKV is already selected as the output. Open the settings (gear icon) to fine-tune the result.
- Click Convert All. FFmpeg runs inside your browser through WebAssembly; nothing is uploaded.
- Download your .mkv files as soon as each one finishes.
What to know about AVI to MKV conversion
- The video is re-encoded to H.264 video and AAC audio so it plays wherever MKV is supported, and odd frame sizes are adjusted automatically.
- You can change the resolution, frame rate, playback speed and quality (CRF) before converting.
AVI vs MKV
| Feature | AVI (Audio Video Interleave) | MKV (Matroska Video) |
|---|---|---|
| Codecs used by PureConverter | H.264 video and MP3 audio | H.264 video and AAC audio |
| Best for | compatibility with older Windows software | movies with several audio and subtitle tracks |
| Opens in | Windows Media Player, VLC, mpv and most media players | VLC, mpv and most media players, Plex and most smart TVs |
AVI (Audio Video Interleave): A classic Microsoft multimedia container format supporting synchronous audio-with-video playback.
MKV (Matroska Video): A flexible, open-standard video container format that can hold unlimited video, audio, picture, or subtitle tracks.
Conversion options
- Resolution: original, 1080p, 720p, 480p or 360p
- Frame rate and playback speed (0.5× to 2×)
- Quality presets or a custom CRF value, and lossless mode
- Audio bitrate, sample rate and channels
Frequently asked questions
Is it safe to convert AVI to MKV here?
Yes. Your files are processed entirely on your own device by WebAssembly code running in the browser. They are never uploaded, so nobody else can see them, and the converter keeps working even if your connection drops after the page loads.
Is there a file size limit?
There is no server-side limit. The only limit is the memory available to your browser, typically 1.5–4 GB on desktop computers.
Can I convert several AVI files at once?
Yes. Add as many files as you like; they are converted in parallel according to your device's CPU cores, and you can apply the same settings to all of them.
Related conversions
Need the opposite? Convert MKV to AVI.
Convert AVI to other formats
- AVI to MP4
- AVI to MP3
- AVI to WEBP
- AVI to GIF
- AVI to WAV
- AVI to MOV
- AVI to M4A
- AVI to FLAC
- AVI to WEBM
- AVI to AAC
- AVI to OGG
- AVI to OPUS
Convert other formats to MKV
- MP4 to MKV
- MOV to MKV
- WEBM to MKV
- WMV to MKV
- FLV to MKV
- M4V to MKV
- MPEG to MKV
- TS to MKV
- 3GP to MKV
- OGV to MKV
See every AVI converter and MKV converter, or browse the full converter directory.