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AVI to MKV

Converts AVI files to MKV format — legacy video compatibility to advanced video archiving with multiple subtitle tracks, chapters, and audio streams in one file. All conversion happens locally in your browser with no file size limits.

Runs on FFmpeg

100% Local Browser Native

How to Use the AVI to MKV

1. Drop AVI file(s)

Upload your AVI source. Runs locally on FFmpeg.

2. Set MKV options

Set CRF and resolution — CRF 23 balanced, 28 for small web files. Keep the tab open while it works.

3. Download MKV

Files save straight to your device — downloads on local tools are unlimited.

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Frequently Asked Questions

Why convert AVI to MKV?

AVI (Audio Video Interleave) uses uncompressed or lossy encoding and is best for legacy video compatibility — older software, embedded systems, and archival playback. MKV (Matroska Video) uses lossless container encoding and excels at advanced video archiving with multiple subtitle tracks, chapters, and audio streams in one file. Converting between them lets you take advantage of each format's strengths — for example, using a compressed format for sharing and a lossless format for editing. All conversion happens locally in your browser with no file size limits.

Does it preserve video quality?

If re-encoding with the same codec, quality depends on bitrate settings. Stream copy (no re-encode) preserves exact quality when the codec is compatible.

Can I add subtitles during conversion?

The basic converter transcodes the video stream. For subtitle addition, use a dedicated MKV muxing tool after conversion.

When using AVI to MKV, what is the maximum file size?

Videos up to 250MB are supported for everyone. Larger files may cause memory issues in the browser.

Is AVI to MKV conversion done locally?

Yes. All conversion runs in your browser using FFmpeg. No video files are uploaded to any server.

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Last updated October 2026