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

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