Video format
What is a MKV file?
MKV (Matroska) is a flexible open container that can hold multiple audio tracks, subtitles, and chapters alongside the video.
Matroska was designed from the ground up as an open, extensible container, meaning a single MKV file can bundle several audio tracks (say, multiple languages), several subtitle tracks, and chapter markers, all switchable during playback — something older containers like AVI and even MP4 handle less gracefully. That flexibility made it the format of choice for archiving TV shows and films with multiple language options, though a handful of phones and streaming devices still expect MP4 and need MKV converted first.
How to open a MKV file
MKV files open readily in VLC Media Player. For real editing rather than just viewing, reach for DaVinci Resolve, Adobe Premiere Pro (with an extension).
Strengths & limitations
Good for
- supports multiple audio/subtitle tracks in one file
- open format, no licensing fees
Watch out for
- not natively supported by some phones and TVs without an app
Convert MKV files
Orbfile can convert MKV both ways, entirely in your browser — pick a direction below:
Frequently asked questions
What does a MKV file contain?+
MKV (Matroska) is a flexible open container that can hold multiple audio tracks, subtitles, and chapters alongside the video.
Can I convert MKV for free?+
Yes — Orbfile's video converter handles MKV for free, with no file limit, watermark, or account, and it runs entirely in your browser.
Is converting a MKV file safe and private?+
Yes. Orbfile processes MKV files locally on your device using WebAssembly — nothing is uploaded to a server, so there's nothing to leak or store.
Who created the MKV format?+
MKV was developed by Matroska.org, first released around 2002.
Browse the full file format guide.