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MKVToolNix vs MKV Muxing Batch GUI: catalog facts
MKVToolNix	MKV Muxing Batch GUI
Free Free and open source under the GPL 2.0.	Free Free and open source under the GPL-2.0 licence.
Windows, macOS, Linux	Windows, Linux
Adds, removes and retags tracks without re-encoding anything Header editor for fixing default track flags and languages	Batch processing of many videos at once Separate options for subtitles, audio, chapters and attachments
Matroska output only Cannot change the video or audio encoding at all	Output is MKV only Development has been quiet since early 2024
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: GPL-2.0
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.