What is a .mkv file?
A .mkv file is a matroska video. Its registered MIME type is video/x-matroska, which places it in the video family of formats.
Technically it is a specialised form of application/x-matroska, so tools that understand that format can often read at least part of it.
MKV is a binary format: the contents are not readable text, so opening it in a text editor shows scrambled characters.
The same format is also saved with the extensions .mk3d, .mks.
MKV file format details
| Extension | .mkv |
|---|---|
| Format | Matroska video |
| MIME type | video/x-matroska, video/matroska |
| Category | Video |
| Text or binary | Binary |
| Based on | application/x-matroska |
| File signature | None fixed |
| Registered with IANA | No |
| Other extensions | .mk3d, .mks |
How to open MKV files
| Windows | VLC media player is free and plays almost every audio and video format, MKV included in most cases. Media Player and Films and TV handle the common ones. |
|---|---|
| Mac | QuickTime Player plays formats Apple supports. VLC or IINA play most others. |
| iPhone and iPad | The Files app plays formats Apple supports. VLC for iOS plays most others. |
| Android | Most gallery and music apps play common formats; VLC for Android plays almost everything. |
Convert MKV files
TapToConvert converts MKV files in your browser, without uploading them. Open the MKV converter, or go straight to a conversion:
MKV file FAQ
What is a .mkv file?
A .mkv file is a matroska video, with the MIME type video/x-matroska.
How do I open a .mkv file?
VLC media player plays most audio and video formats on Windows, Mac, iPhone and Android.
Is a .mkv file safe to open?
MKV files hold data rather than programs, but any file from an unknown source can be crafted to exploit the software that opens it. Keep that software up to date. The viewer on this page only reads the bytes and never runs anything.
What is the MIME type of .mkv?
video/x-matroska, and it is also seen as video/matroska. Web servers send this type so browsers know how to handle the file.
Is MKV a text or binary format?
Binary. Its contents are not readable as text.
File type facts come from the IANA media type registry, the mime-db project and the freedesktop.org shared MIME database.