MKVToolNix is the one of the best collection of tools (mkvmerge, mkvinfo, mkvextract, mkvpropedit and mmg) for modifying MKV files.

The graphical user interface (GUI) of the program allows you to manipulate Matroska (MKV) files in several ways.

You can use those tools to create, split, edit, mux, demux, merge, extract or inspect Matroska files.

MKVToolnix will also work with other video formats. Such as AVI, MPEG, MP4, MPEG, Ogg/OGM, RealVideo, MPEG1/2, H264/AVC, Dirac, VC1.

And more as well as some video codecs such as VP9 video codec support – reading from IVF, Matroska, WebM files, extract to IVF files.

Moreover the program can work with audio files such as AAC, FLAC, MP2, MP3, AC3, DTS/DTS-HD, Vorbis, RealAudio. And also work with most subtitle formats including SRT, PGS/ SUP, VobSub, ASS, and SSA.

It is a cross-platform application that will work on Microsoft Windows (both 32 and 64-bit versions), Apple macOS and Linux operating systems.

Here is also the portable version which does not require installation. You just need to start the function. It can also be stored on external devices and run on any computer you have access to.

# Version 100.0 “Do Hot Girls Like Chords” 2026-07-05

## New features and enhancements

* all: added new scalable (SVG) application icons for all applications,
replacing the existing pixmap (PNG, ICO) icons. Icons from Sarreq
Teryx. Implements #6253.
* mkvmerge: MP4 reader: track names are now read from the track’s user-data
atoms (`trak` → `udta` → `name`) if present. Implements #6274.
* MKVToolNix GUI: executing actions configuration, type “play audio file”:
added a slider to make configuration more intuitive. Implemented by #6267.
* MKVToolNix GUI: executing actions: macOS only: the GUI will now use bundled
audio files for “play audio file” actions that Qt can play instead of using
macOS’s system sounds. Implemented by #6268. Fixes #6264.
* MKVToolNix GUI: executing actions: Windows only: added a new type: executing
a PowerShell script. Either an existing script file can be selected or
custom PowerShell script code entered in a small editor. The executed script
has access to all `MTX_…` variables through the environment,
e.g. `$env:MTX_DESTINATION_FILE_BASE_NAME`. Workaround for the problems
talked about in #6254.
* MKVToolNix GUI: job queue: added a context menu for opening copies of the
selected queue jobs in the multiplexer as new settings there without
removing the queue jobs. Implements #6255.
* MKVToolNix GUI: job queue: added a search functionality for jobs that
searches in job descriptions, outputs, warnings & errors. Implements #6256.

## Bug fixes

* command-line tools: Windows: switched to Boost’s UTF-8 code-conversion facet
(`boost::locale::utf8_codecvt`) from `std::utf8_codecvt` included in
MingW. This seems to fix an issue with converting certain high code point
from `wchar_t` to `char` (from UTF-32/16 to UTF-8), preventing interesting
exceptions from being thrown. Fixes #6257.
* mkvmerge: AAC: fixed mis-detection of ADTS streams not starting on a frame
boundary. Fixes regression starting with v87 when fixing AAC LATM config not
being parsed if it wasn’t present in the first AAC frame. Patch by
Corticalcode. Fixes #6196.
* mkvmerge: MPEG TS reader: under certain rare conditions mkvmerge was
skipping a certain amount of content at the start of the main M2TS file when
reading MPLS playlists. The amount of content skipped proportional to the
probe range percentage. This only happened when the source Blu-ray contains
HDMV TextST subtitles. Fixes #6269.
* MKVToolNix GUI: executing actions configuration, type “play audio file”:
fixed audio volume not working since switching to Qt 6 due to its interface
taking a `float` in range `0.0`–`1.0` instead of the old interface taking an
`int` in range `0`–`100`. Implemented by #6267. Fixes #6266.
* MKVToolNix GUI: executing actions: fix backslash handling when parsing a
Unix-shell escaped string into separate arguments. The user-visible fix is
that the command-line in the “executing actions” dialog will not have the
quoting changed in wrong ways by the GUI when the GUI adds another variable
upon user request, a regression introduced in v99. Fixes #6253.

## Build system changes

* all: when building for Windows the programs ImageMagick (executable
`magick`) & Inkscape (executable `inkscape`) are required in order to build
ICOs from SVGs.
* macOS: include the app’s supported platform(s) in `Info.plist` to correctly
resolve the app’s Kind as Apple Silicon in System Information. Detected
during discussion of #6260.
* macOS: updated Qt to 6.11.1. The patch that made building Qt from source
possible on macOS 26.4 (by Touchstone64) has been removed as Qt 6.11.1
includes the fix upstream. See #6276.

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