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 95.0 “Goodbye Stranger” 2025-09-14
## New features and enhancements
* mkvmerge, MKVToolNix GUI: new chapter generation feature: a new placeholder
has been introduced when generating chapters for appended files, \<TITLE\>,
which will be replaced by the appended file’s title metadata. Implements
#6151. Implementation by Jason Donenfeld.
* mkvmerge: the display matrix from MP4 files are now translated into
appropriate roll and yaw values for output MKV files. Implements
#6150. Implementation by Jason Donenfeld.
* mkvmerge: add `–date` argument to set the date metadata. Implements
#6155. Implementation by Jason Donenfeld.
## Bug fixes
* build system: fixed building with the upcoming Boost v1.89.0 by only
requiring the header part of the Boost.System library as it’s been
header-only since v1.69.0. Fixes #6143.
* mkvmerge: PCM packetizer: mkvmerge will now always write frames with 40ms of
samples, no matter how long or short the frames in the source files
were. Part of the fix of #6149.
* mkvmerge: MP4/QuickTime reader: fix exorbitant memory usage when reading PCM
audio tracks. Part of the fix of #6149.
## Build system changes
* Boost v1.74.0 or newer is now required.
