MKV to AVI converter

Convert MKV video to AVI in your browser. When the codec fits, only the container changes, so it takes seconds and the quality stays the same.

    Drop MKV files here or choose files.

    • 500MB per file. Up to 10 minutes when only the container changes, 3 minutes when re-encoding. Up to 5 files at a time
    • The first time you use it, the browser downloads the video engine (about 31MB)

    Auto skips re-encoding when the source can go into the new format as is, which is fast and keeps the quality intact. Otherwise it re-encodes at normal quality. Light reduces the file size at some cost in picture quality.

    For vertical video this refers to the shorter side. Choosing a size smaller than the original forces a slower re-encode. The tool never upscales.

    Files never leave this device. Privacy policy

    Result

    Upload a MKV video and click Convert. The AVI file will appear here.

    What to do next

    AVI to MKV converter

    Convert a AVI video back to MKV.

    Compress an MKV file

    Shrink the video to fit iMessage, Gmail or Discord upload limits.

    Trim a video

    If a video is too long to convert, cut out the part you need first. Quality stays the same.

    How it works

    Choose a MKV video and click Convert to save it as AVI. AVI is an old format, useful for devices that cannot play MP4, such as older DVD players, car monitors and digital photo frames. The video is Xvid and the audio is MP3.

    With quality set to Auto, the tool first checks the codec inside the video. If AVI can hold it as is, it swaps only the container without re-encoding. That takes a few seconds and the quality is unchanged. If the codec does not fit, the tool re-encodes and tells you below the result which method it used. Several files convert one after another.

    Things to know

    Converting to AVI almost always means re-encoding, so the limit is 3 minutes, and the result can be larger than the source.

    Re-encoding processes every frame on your device, so it is slow. That is why the limit is 10 minutes when only the container changes and 3 minutes when re-encoding. 4K video is reduced to 1080p when it has to be re-encoded.

    Frequently asked questions

    What happens to AC-3 or DTS audio and subtitles inside an MKV?

    If the video is H.264, it is copied as is, and only AC-3 or DTS audio, which MP4 and MOV handle poorly, is converted to AAC. In that case even a 10-minute video finishes quickly. Only the first video and audio tracks are kept, and subtitles inside the MKV are dropped.

    What happens to quality and file size with AVI?

    Xvid is an older compression method, so at the same quality an AVI is larger than an MP4, usually 2 to 3 times. Light reduces the size, but the picture suffers too. For current devices, MP4 is both smaller and sharper.

    Why does it take so long? Does it work on a phone?

    The video is processed on your device, not on a server. When only the container changes, it takes a few seconds. When the video has to be re-encoded, it can take several times the length of the video depending on your hardware. It works on a phone but much more slowly, and it stops if the screen turns off or you switch apps. For long videos, use Chrome or Edge on a computer.

    Are my files uploaded to a server?

    No. The conversion runs entirely in this browser, and the file never leaves your device. The only download is the conversion engine, once. The result disappears when you close the page, so use the save button to keep it.

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