MKVToolnix

MKVToolnix is a set of tools to create, alter and inspect Matroska files under Linux, other Unices and Windows. They do for Matroska what the OGMtools do for the OGM format and then some.

With these tools one can get information about (mkvinfo) Matroska files, extract tracks/data from (mkvextract) Matroska files and create (mkvmerge) Matroska files from other media files. Matroska is a new multimedia file format aiming to become THE new container format for the future.

• Release Date: May 25, 2026
• Download(s):
  mkvtoolnix-32-bit-99.0-setup.exe
  mkvtoolnix-32-bit-99.0.7z
  mkvtoolnix-64-bit-99.0-setup.exe
  mkvtoolnix-64-bit-99.0.7z
  MKVToolNix-99.0-1-universal.dmg
  MKVToolNix_GUI-99.0-x86_64.AppImage
• # Version 99.0 "Buka" 2026-05-24
  
  
  ## New features and enhancements
  
  
  * MKVToolNix GUI: the GUI will now remember the last used directory for
    selecting audio files for playback in "play audio file" program runners
    separately from any other "open file"-type situations. This directory will
    also default to `/System/Library/Sounds` on macOS now. Implemented by #6213.
  * MKVToolNix GUI: executing actions -> running programs: added new variables:
    `MTX_DESTINATION_FILE_BASE_NAME` (the name without the drive letter, path or
    the suffix; e.b. `/movies/A.new.hope.mkv` -> `A.new.hope`) and
    `MTX_DESTINATION_FILE_SUFFIX` (only the letters after the last `.`,
    e.g. `/movies/A.new.hope.mkv` -> `mkv`). Added examples to all the
    destination file variables in the popup menu when adding variables in the
    preferences. Implements parts of #6220.
  * MKVToolNix GUI: executing actions -> running programs: the command-line input
    widget will now receive focus again after using the popup menu for adding a
    variable. Implements parts of #6220.
  * MKVToolNix GUI: executing actions -> running programs: the variables will now
    also be set as environment variables when running a program after a job
    completes.
  * MKVToolNix GUI: executing actions -> running programs: when using the
    "Execute now" button for testing the `MTX_…` variables will be set to the
    current multiplexer tab's values for easier testing. Implements parts of
    #6220.
  
  
  ## Bug fixes
  
  
  * mkvmerge: if using legacy font MIME types is off mkvmerge will now remap
    legacy font MIME types present in source files into the current ones. Patch
    by corticalcode via #6249.
  * mkvmerge, mkvpropedit, MKVToolNix GUI's multiplexer & header editor: on
    Windows & macOS the MIME type detection will now use the FreeDesktop.org
    MIME database instead of falling back to file extension-based guesses. This
    matches how it works on other operating systems. This fixes e.g. OpenType
    fonts being detected as the legacy type `application/vnd.ms-opentype`
    instead of the current IETF RFC, `font/otf`, no matter what the "use legacy
    font MIME types" settings in the preferences was set to. Fixes #6240 for
    Windows; fixes #6248 for macOS. Implemented by corticalcode for macOS in
    #6250.
  * MKVToolNix GUI: update checker: fixed a potential attempt to read from an
    invalid memory address if an error occurred when parsing the XML file
    retrieved from the official MKVToolNix server.
  * macOS: GUI: the default audio file for program runners of type "play audio
    file" has been changed to an AIFF file as Qt's Multimedia backend routes
    through Core Audio which doesn't support WebM/VP8/Vorbis/Opus. Existing
    configurations will be updated if they point to the prior default WebM audio
    file. Fixes #6209.
  
  
  ## Build system changes
  
  
  * macOS: `build.sh`: the Qt installation is now done via `cmake --install`
    instead of using classic `make` as the classic Makefiles produced by Qt's
    build system are incomplete. Patch by corticalcode. Fixes #6205.
  * macOS: `build.sh`: the binaries in the DMG are now stripped of debug
    symbols. Patch by corticalcode. Fixes #6206.
  * macOS: `build.sh`: enabled release build optimizations for
    dependencies. Patch by corticalcode. Fixes #6207.
  * macOS: `build.sh`: disabled use of `pkg-config` for Qt to prevent linking
    against installed non-OS libraries such as from Homebrew. Patch by
    corticalcode. Fixes #6208.
  * macOS: added support for notarization of a macOS disk image by an Apple
    developer account. Implementation of #6212 by Touchstone64.
  * macOS: patch added to make building Qt 6.11 from source possible on macOS
    26.4. Patch by Touchstone64.
  * macOS: additions to DMG package naming including the machine type it targets
    (arm64 or x86_64) and a revision number (to support re-packaging of an
    existing MKVToolnix release). For example, MKVToolNix-98.0-1-arm64.dmg would
    represent the first revision of a DMG package for an Apple Silicon Mac,
    containing MKVToolNix release 98.0. Implementation by Touchstone64.
  * macOS: the packaging process now verifies the MKVToolNix source release
    using the author's GPG key before packaging. Implementation by Touchstone64.
  * macOS: the app bundle name has been standardised by removing the version
    number, so DMG packages will contain 'MKVToolNix.app'. Implementation by
    Touchstone64.
  * macOS: Qt is now built without printing support, reducing the size of the
    resulting DMG slightly. Implementation by Corticalcode. Implements #6230.