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ClipTools
MKVAVI

Convert MKV to AVI

This free MKV to AVI converter changes your Matroska Video (.mkv) file into a Audio Video Interleave (.avi) file, right in your browser. There is nothing to install, no account to create, and no limit on how many files you convert.

100% private. Your file is processed locally in your browser with WebAssembly — it is never uploaded to a server, stored, or seen by anyone.

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The conversion runs on your own device using ffmpeg compiled to WebAssembly (ffmpeg.wasm), so your file is never uploaded to a server. AVI is best for older Windows software and archives, which is the usual reason to convert from MKV.

Why convert MKV to AVI?

  • MKV and AVI are similarly compatible, so you are mainly changing the container.
  • The video is re-encoded to efficient H.264, so the AVI file is usually about the same size as your MKV.
  • Pick AVI when you need a file made for older Windows software and archives.

MKV vs AVI

PropertyMKVAVI
Full nameMatroska VideoAudio Video Interleave
ContainerMatroskaAVI
Typical codecH.264 / H.265MPEG-4 / MJPEG
CompatibilityLimitedLimited
Relative sizeMediumLargest
Best forArchiving with multiple tracks and subtitlesOlder Windows software and archives

How to convert MKV to AVI

  1. Add your MKV file

    Drag and drop your .mkv file onto the upload area, or click to browse and pick it from your device.

  2. Start the conversion

    Click "Convert to AVI". Everything runs locally with ffmpeg compiled to WebAssembly (ffmpeg.wasm) - your file stays on your device.

  3. Wait a few seconds

    A progress bar shows the conversion. The first run is slightly slower while the engine loads, then it is cached.

  4. Download your AVI file

    When it finishes, download the .avi file straight to your device.

Frequently asked questions

Is this MKV to AVI converter free?
Yes. It is completely free with no signup, no watermark, and no limit on how many files you convert. It is supported by ads, which keeps the conversion itself free.
Are my files uploaded to a server?
No. The conversion runs locally in your browser using ffmpeg compiled to WebAssembly (ffmpeg.wasm), so your file is processed in memory on your own device and is never uploaded, stored, or seen by anyone.
Will I lose quality converting MKV to AVI?
The video is re-encoded to AVI with a high-quality setting, so the result looks very close to the original MKV. Re-encoding is never bit-for-bit identical, but the loss is minimal.
Will the file get smaller or larger?
Usually similar. The video is re-encoded to H.264 at a high-quality setting, so the AVI file is typically about the same size as your MKV; the container itself adds little.
What is the difference between MKV and AVI?
MKV is Matroska Video (a Matroska container, typically H.264 / H.265); AVI is Audio Video Interleave (an AVI container, typically MPEG-4 / MJPEG). AVI is best for older Windows software and archives, while MKV is best for archiving with multiple tracks and subtitles.
How long does the conversion take?
Most files finish in a few seconds to under a minute, depending on length and your device. The first conversion is a little slower while the engine downloads and caches, then later runs start instantly.

Related conversions

MP4 → AVIMOV → AVIMKV → MP4MKV → WebMMKV → MOVMKV → MP3

Need more formats or options? Use the full Change Video Format.