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MKVToolNix vs gMKVExtractGUI: catalog facts
MKVToolNix	gMKVExtractGUI
Free Free and open source under the GPL 2.0.	Free Free and released into the public domain under the Unlicense.
Windows, macOS, Linux	Windows
Adds, removes and retags tracks without re-encoding anything Header editor for fixing default track flags and languages	Covers most mkvextract and mkvinfo functions in one window Saves typing long mkvextract command lines
Matroska output only Cannot change the video or audio encoding at all	Needs MKVToolNix installed separately Windows only, built on .NET Framework 4.0
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: Unlicense
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 2, 2026

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