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 92.0 “Everglow” 2025-04-26

## New features and enhancements

* mkvmerge: FLAC reader: pictures embedded into the FLAC file were already
handled as attachments, but they were left in the codec initialization data
as well. They’re now removed from the codec initialization data. See #6079.
* mkvmerge: FLAC reader: padding metadata blocks will now be removed from the
codec initialization data. See #6079.
* mkvmerge: FLAC reader: embedded Vorbis comments will now be converted into
Matroska comments or track/global header fields when available (e.g. `TITLE`
will become the segment title & track’s name, `LANGUAGE` will become the
track’s language). Copying of Vorbis comments that are converted into actual
Matroska tags can be prevented with the usual options,
e.g. `–no-track-tags`. The comments will also be removed from the codec
initialization data. Implements #6079.
* mkvmerge, MKVToolNix GUI’s chapter editor: when reading simple (OGM-style)
chapter files & no character set is given for the file, mkvmerge will try
UTF-8 first before falling back to the system’s default encoding. Implements
#6084.
* MKVToolNix GUI: multiplexer: the special drag & drop zones added in v91 are
now shown by default in new installations.
* MKVToolNix GUI: in new installations the main window will now be sized at
75% of the screen’s resolution initially with a certain minimum initial
size. This improves initial readability on high DPI screens that use screen
scaling factors such as 150%.

## Bug fixes

* mkvmerge: Ogg reader: during identification the track tags are now reported
properly.
* MKVToolNix GUI: multiplexer: within the “additional options”, both
track-specific ones & the global ones on the “Output” tab, it wasn’t
possible to specify empty (zero-length) arguments. With the intended syntax
of two consecutive single or double quotation marks the empty arguments were
simply skipped. This was fixed, and it is now possible to specify
e.g. `–title “”` in the global “Additional options” in order to force no
title to be written ever. Fixes #6087.

## Build system changes

* Windows build: the `packaging/windows/populate_installer_dir.sh` now expects
the user to pass the Saxon-HE’s JAR file name to be passed with the `-s` or
`–saxon-jar` parameter instead of the base directory for Saxon-HE. This
allows newer versions of Saxon-HE to be used.

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