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 98.0 “Chonks” 2026-04-05

## New features and enhancements

* all: huge update to the Japanese translations which had been not worked on
for several years. The program translation is now complete again, the man
page translation has been extended as well. Both were reworked in most
places. Translations by coolvitto.
* GUI: chapter editor: added an option in the “additional modifications”
dialog that toggles applying the selected modifications to all currently
open chapter editor tabs. Implements #6189.
* GUI: macOS: added dock icon progress bar for job queue. Patch by Miklos
Juhasz.

## Bug fixes

* GUI: chapter editor: when renumbering chapters limiting the number of
chapters to renumber did not work. Fixes #6199.
* GUI: macOS: fixed refreshing widgets after system switches between dark &
light modes. Patch by Miklos Juhasz.

## Build system changes

* The bundled `fmt` library was updated to v12.1.0, fixing a build issue on
FreeBSD. Fixes #6191.

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