AVI to MKV Converter
Convert AVI to MKV online for free. Change video format for playback, editing, uploads, social sharing, or better compatibility across devices and platforms.
Converting AVI to MKV re-encodes the video into the MKV container. Resolution and frame rate are preserved by default, and the audio track is copied without re-encoding when codec compatibility allows. File size depends on the chosen output codec.
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Checking files and selected output formats.
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Convert AVI Video in 3 Steps
Re-encode a video for broader playback support, easier editing, smaller files, or platform-specific upload requirements.
Drop your AVI video onto the tool or click to browse. Our converter handles all major codecs including H.264, H.265, VP8, and VP9 inside the AVI container.
Your video is re-encoded into the MKV container with the optimal codec. Resolution and frame rate are maintained, and the audio track is preserved without re-encoding when possible.
Download your converted MKV video ready for playback, editing, or uploading to any platform. Files are automatically deleted from our servers within 24 hours.
Why Convert AVI to MKV
MKV can hold virtually unlimited audio, subtitle, and video tracks in a single file. Store a movie with dozens of language audio tracks and subtitles in one convenient container.
MKV supports every major video codec including H.264, H.265, VP9, AV1, and more. It is the most flexible container format, accepting virtually any combination of audio and video codecs.
MKV files support embedded chapters with named markers, allowing viewers to jump between scenes, segments, or episodes. Chapter metadata makes long videos easy to navigate.
MKV can store lossless video codecs like FFV1 and lossless audio like FLAC, making it the preferred format for archiving high-value video content without any quality loss.
MKV containers can embed fonts, cover art, and supplementary files directly inside the video file. Styled subtitles display correctly everywhere because the required fonts travel with the file.
AVI vs MKV: Side-by-side
Technical comparison of the two formats — useful for deciding which to use, or for confirming what changes during conversion.
| Property | AVI | MKV |
|---|---|---|
| Full name | Audio Video Interleave | Matroska Video |
| Year introduced | 1992 | 2002 |
| Developer / standard body | Microsoft | Matroska Foundation |
| MIME type | video/x-msvideo | video/x-matroska |
| File extension | .avi | .mkv |
| Compression | Codec-dependent (DivX, XviD, MJPEG) | Codec-flexible (H.264, H.265, AV1, VP9) |
| Color / data depth | Codec-dependent | Up to 12-bit |
| Max dimensions / size | Codec-dependent | Codec-dependent |
| Transparency | No | No |
| Animation | No | No |
| Standard / specification | Microsoft RIFF | Matroska |
| Best for | Legacy video files, archival | High-quality video with multiple audio/subtitle tracks |
About the AVI Format
AVI (Audio Video Interleave) is a multimedia container format introduced by Microsoft in 1992 as part of its Video for Windows technology. It is one of the oldest video container formats still encountered today. AVI uses a straightforward structure where audio and video data are interleaved — stored in alternating chunks — allowing simultaneous playback of both streams. Its simplicity made it a dominant format throughout the 1990s and early 2000s.
While AVI benefits from broad legacy support and a simple, well-understood structure, it lacks many features expected in modern video formats. It has no native support for streaming over the internet, cannot embed modern subtitle formats or chapter markers, and its compression efficiency depends entirely on the codec used. AVI files also tend to be larger than equivalent MP4 or MKV files. The format is being gradually replaced by MP4 and MKV in virtually all use cases, though it still appears in older video archives and some legacy industrial systems.
AVI to MKV FAQ
Quick answers about compatibility, quality, metadata handling, and the most common reasons to convert AVI files to MKV.
How do I convert AVI to MKV online?
Why would I convert AVI to MKV?
Will converting AVI to MKV affect video quality?
How will file size change when converting AVI to MKV?
When is MKV a better target than AVI?
Can I batch convert multiple AVI files to MKV?
Is it safe to convert AVI to MKV online?
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