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MKVToolNix vs Subler: catalog facts
MKVToolNix	Subler
Free Free and open source under the GPL 2.0.	Free Free to download from the project's GitHub releases.
Windows, macOS, Linux	macOS
Adds, removes and retags tracks without re-encoding anything Header editor for fixing default track flags and languages	Muxes tracks from MOV, MP4 and MKV into MP4 without re-encoding Creates TX3G and WebVTT subtitles that work on Apple devices
Matroska output only Cannot change the video or audio encoding at all	macOS only, requires macOS 10.13 or later Outputs MP4 only
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License not stated
No account needed	No account 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 1, 2026

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