How to convert a .MKV file online
Three steps, all tab.
Open your file
Drop your .MKV file and every video, audio and subtitle track inside is listed with its codec, resolution, frame rate and language.
Preview
See frames from across your .MKV file before you convert, even when your browser can't play the codec inside.
Convert
Pick MP4, WEBM or MP3, or repack to MKV without re-encoding. Play the result right here, then download it.
What is a .MKV file?
Everything worth knowing about Matroska Video.
An MKV file is a Matroska multimedia container that holds video, multiple audio tracks, subtitles and chapters in one file. Open it for free with VLC media player, or on Windows 11 with the built-in Media Player. If a TV or phone refuses the file, you can usually repackage (remux) it to MP4 with no quality loss.
Programs that open .MKV files
- Windows
- VLC media player, MKVtoolnix, Media Player (Windows 11) / Movies & TV, MPC-HC (clsid2 fork), mpv, PotPlayer
- macOS
- VLC media player, Elmedia Player, IINA
- Linux
- VLC media player, GNOME Videos (Totem), mpv
- Android
- MX Player, VLC for Android
- iOS
- OPlayer, VLC for iOS
| Full name | Matroska Video |
|---|---|
| Developer | Matroska.org (open-source project, started by Steve Lhomme) |
| First released | 2002 (fork of the MCF project); EBML standardized as IETF RFC 8794 (2020) |
| Category | Audio & Video |
| MIME type | video/x-matroska |
| Signature | 1A 45 DF A3 (EBML header (non-printable)) |
Related viewers
Other free tools to open and preview your files.
Is my .MKV file uploaded to a server?
No. Your .MKV file is converted for you. The converted file is created in memory,.
Why is conversion slower than desktop software?
Browsers give web pages a single CPU core for this kind of work and no hardware video encoder. Short clips convert in seconds; for long 4K films a desktop app like HandBrake is faster. Use Start and Length to convert just the part you need.
Which output format should I pick?
MP4 plays on every phone, TV and browser. WEBM is an open format that's great for the web. MP3 keeps only the sound. MKV (no re-encode) is instant and lossless, but only changes the container.
Can I keep all audio tracks and subtitles?
The MKV (no re-encode) option copies every track as-is. MP4 and WEBM keep the first video and audio track, which is what most players use.
Why can't some files be converted?
Files protected with DRM (for example purchased iTunes .m4p songs or some .wmv rentals) are encrypted. We can show what's inside, but nobody can convert them without the key.
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