What is MKV (Matroska Video)?
MKV is a flexible open container that holds any number of video, audio and subtitle tracks.
MKV is popular for archives and screen recordings. Convert to MP4 when you need to share or edit the video.
File extensions: .mkvMIME types: video/x-matroska
Advantages
- Holds many audio and subtitle tracks
- Open standard
- Supports nearly any codec
Disadvantages
- Not played natively by many phones and TVs
- Not supported by web browsers
- Weak editor support
Typical uses
- Movie archives
- Videos with several languages
- Screen recordings (OBS)
Compatibility
VLC and many media players handle MKV; browsers, iPhones and many editors do not.
Convert MKV to another format
Convert to MKV from another format
Frequently asked questions
Are my files uploaded to a server?
No. The conversion runs entirely in your browser with local code. Your files never leave your device, and there is no upload.
Is there a file size limit?
There is no limit on our side, but your browser memory is. Images work for very large files; for videos, files above a few hundred megabytes can fail on devices with little memory.
Will the quality suffer?
That depends on the target format and settings. Use the quality option to balance size and detail; lossless targets keep everything the source contained.
Which browsers are supported?
Current versions of Chrome, Edge, Firefox and Safari. Fast hardware paths are used where available, with a compatible fallback otherwise.