Mkvtoolnix how to Add Chapters

Updated: June 4, 2026 · Full review · Alternatives · Converters

Open the MKV file in MKVToolNix, select the chapter editor, and import or create chapter markers at your desired timestamps—this is the fastest way to accomplish mkvtoolnix how to add chapters without needing external software.

MKVToolNix 91.0.0 includes a dedicated chapter editor that makes organizing video content straightforward. Whether you're working with H.264 or H.265 encoded files, the process remains consistent. The application handles Matroska containers natively, and chapter support integrates directly into the GUI interface, so you're not juggling separate tools.

Understanding Chapter Files in MKV Containers

Chapters divide video content into labeled segments, similar to DVD chapter markers. The Matroska format stores these natively within the container itself—no external file needed. When you add chapters to an MKV, playback devices and media players jump to these points on demand, making navigation for long-form content like movies, lectures, or podcasts.

MKVToolNix handles chapter data in XML format internally, but you'll rarely touch the raw code. The editor abstracts this away completely.

Steps for MKVToolNix How to Add Chapters

Opening the Chapter Editor

Launch the application and open your MKV file. Navigate to the Multiplex tab if you're starting fresh, or select an existing file. Click the Chapter editor button in the top menu bar. A new window opens displaying any existing chapters or an empty timeline if the file has none.

The chapter editor shows the video duration and a list view below. This is where all chapter data lives.

Creating Chapter Markers

Click the Add chapter button (typically a plus icon) to insert a new chapter at your cursor position. A dialog appears asking for:

Start time: Enter hours, minutes, seconds, and milliseconds
Name: Give the chapter a descriptive label (e.g., "Introduction," "Part 2")

Set the exact timestamp where the chapter should begin. If you're working with a 90-minute film, you might place chapters every 10–15 minutes. Hit OK and the entry appears in the list.

Repeat for as many chapters as your content requires. The editor lets you add unlimited markers.

Reordering and Editing Existing Chapters

Select any chapter in the list and click Edit chapter to adjust its start time or name. You can also drag entries up or down to reorder them, though most players respect the timestamp order regardless of list position. Remove unwanted chapters with the Delete chapter button.

Pro Tip: If your MKV already contains chapters you want to modify, import them directly by opening the file in the chapter editor. The existing chapter data loads automatically—no need to recreate from scratch. Simply adjust timestamps and names as needed, then save.

Saving and Verifying Chapters

Once all chapters are defined, click OK to close the editor. The chapter data remains in memory but isn't written to disk yet. Return to the Multiplex tab and set your output filename. Click Start muxing to create the new MKV file with embedded chapters.

The muxing process combines your video, audio, and subtitle tracks with the chapter data into a single Matroska container. A progress window tracks encoding time. Total duration depends on file size and system performance.

Why Add Chapters to MKV Files

Chapter support improves usability for long videos. Viewers can jump to specific sections instantly rather than scrubbing through the timeline. For content creators, chapters serve as navigation markers that work across Windows 10, Windows 11, Linux Ubuntu, and any device supporting the MKV standard.

As an MKV editor free solution, MKVToolNix outperforms commercial alternatives by offering full chapter functionality without licensing fees. Learn how to extract subtitles from MKV files to manage all metadata in one place.

Comparing Chapter Tools

If you need audio-only chapter handling, Fre:ac as an audio processing alternative supports metadata but focuses on format conversion rather than container editing. For broader file handling, the MKVToolNix GUI interface documentation covers advanced features beyond chapters.

Mkvtoolnix how to add chapters remains the most direct path for Matroska chapter management on Windows and Linux systems. Open source, no restrictions, no watermarks—just functional chapter editing baked into a capable MKV merge tool.