Convert AVI to MKV — Free Online Converter

AVI (Audio Video Interleave) and MKV (Matroska Video) are both flexible container formats, but MKV is vastly more capable. While AVI's RIFF structure limits it to a single video track, a single audio track (in basic AVI), and no native subtitle support, MKV can hold unlimited video, audio, and subtitle tracks with full metadata, chapters, and attachments. Converting AVI to MKV repackages the content in a modern container that supports every codec imaginable — H.264, H.265, VP9, AV1, FLAC, DTS, and more.

MKV eliminates every limitation of AVI. If your AVI files have subtitle files (.srt, .ass) that you want to embed, multiple audio tracks to preserve, or chapters to add, MKV is the ideal container. MKV also removes AVI's original 2 GB file size limit and supports modern features like ordered chapters, segment linking, and high-precision timestamps. Media server software (Plex, Jellyfin, Kodi) handles MKV natively.