What is an MKV file?

Definition MKV (Matroska Video) is an open standard container that supports multiple video, audio, subtitle, chapter, and attachment tracks.

Who made it and why The Matroska project started in 2002 to provide an open, extensible format for complex multimedia packaging.

Why MKV is popular

• Multi-track audio/subtitles
• Strong archive use cases
• Flexible metadata and chapter support

Use it in Subclip Import MKV in Subclip Home Player, edit with AI Video Editor, and convert using MKV to MP4.

History and adoption MKV grew in archival and enthusiast workflows through the 2000s/2010s and was formalized in IETF RFC 9559 (2024).

TL;DR MKV is ideal when one file needs multiple tracks and rich structure.

Related converters MKV to MP4, MP4 to MKV.

Related FAQs How do I open an MKV file?, What is an MP4 file?, How do I open an MP4 file?.