MKVToolNix
MKVToolNix is a macOS utility for creating, editing, inspecting, and remuxing Matroska video files such as MKV without re-encoding media.
What is MKVToolNix?
MKVToolNix is a media utility for working with Matroska container files on macOS. It helps users create, inspect, and modify MKV files by combining video, audio, subtitle, and chapter tracks into a single container or by editing existing files. The app is commonly used by video enthusiasts, archivists, subtitle editors, and anyone who needs to remux media without re-encoding the underlying streams. Its graphical interface makes tasks such as setting track order, language flags, default tracks, attachments, and chapter data easier to manage than command-line workflows alone. MKVToolNix also includes tools for checking file structure and updating container metadata, which is useful when preparing files for playback devices, media libraries, or long-term storage. For Mac users, it fits best as a focused desktop utility for Matroska authoring and maintenance rather than a general video editor.
Key features
- Create MKV files by multiplexing video, audio, subtitle, and chapter tracks
- Edit Matroska header metadata such as track names, languages, and default flags
- Inspect container structure and track information before saving changes
- Split or append Matroska files for packaging and organization tasks
- Manage attachments such as fonts and other embedded resources
- Use a graphical interface for remuxing tasks instead of relying only on command-line tools
Review app leftovers with diCleaner
Inspect caches, support files, containers, and login items before cleaning.
Safety overview
Status: Safe
MKVToolNix is a legitimate desktop utility for handling Matroska media files. It normally needs access only to the video files and folders you choose to open or save, and that access is consistent with its purpose. Changes you make can overwrite container metadata or create new output files, so it is wise to keep originals if you are editing important media collections. It is not a video editor for changing picture content frame by frame, but it can still alter track layout, subtitles, chapters, and other container settings.
Recommendation: Keep MKVToolNix if you regularly work with MKV or Matroska files, especially for remuxing, subtitle management, or track organization. If you no longer use it for media preparation, you can remove it without affecting macOS, though any workflows that depend on it will stop until you reinstall it.
Common paths
/Applications/MKVToolNix.app
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