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MKVToolNix vs MKVtools: catalog facts
MKVToolNix	MKVtools
Free Free and open source under the GPL 2.0.	Freemium Some queue, batch, and watch-mode features are limited to registered copies.
Windows, macOS, Linux	macOS
Adds, removes and retags tracks without re-encoding anything Header editor for fixing default track flags and languages	Processes video into MKV without re-encoding supported tracks Can select, preview, and extract tracks
Matroska output only Cannot change the video or audio encoding at all	Does not create MP4 or AVI files Requires a 64-bit Intel Mac running OS X 10.9 or later
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-2.0	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 8, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.