# Chapters

> How to add, edit and remove chapters in a lesson video, the format they use, and what students see.

Chapters split a lesson video into named parts. Students see them under the video and click one to jump to that moment. Owners and editors can add and edit chapters.

![The lesson editor’s Video tab with the Chapters box on the right, one chapter per line.](/docs/images/lesson-video.webp)

## Add or edit chapters

1. Open the lesson and go to its **Video** tab.
2. In the **Chapters** box, type one chapter per line: a time, then a title.
3. Click **Save chapters**.

Example:

```
0:00 Introduction
1:20 Installing Turbo
12:05 Your first frame
1:02:30 Wrap up
```

The **Chapters** box appears once the lesson has a live, ready video. Chapters always apply to the live video.

## Format rules

- Times are minutes and seconds (`1:20`) or hours, minutes and seconds (`1:02:30`).
- You can put a dash or colon between the time and the title (`1:20 - Installing Turbo`); it's optional.
- The first chapter must start at `0:00`.
- No time can be at or past the end of the video.
- Up to 50 chapters. Titles longer than 100 characters are cut short.
- Lines can be in any order; they're sorted by time. If two lines have the same time, only the first is kept.
- Blank lines are ignored.

If something is wrong, nothing is saved and you see what to fix, for example "“Intro” needs a time first, like 1:20 Title" or "The first chapter should start at 0:00".

## Remove chapters

Clear the **Chapters** box and click **Save chapters**. You see "Chapters removed."

## Draft chapters with AI

[Draft with AI](/docs/draft-with-ai), on the lesson's **AI tools** tab, can suggest chapters from the video's captions. You can edit the suggestion before clicking **Save chapters** there, and edit them again later in the **Chapters** box.

## Chapters and new video versions

Chapters belong to one video version, because their times only fit that cut. When you publish a replacement video, it starts without chapters: add them again for the new video. Rolling back to an earlier version brings back that version's chapters. See [Video versions](/docs/video-versions).

A version made by [AI dubbing](/docs/ai-dubbing) keeps the original's chapters, since the timeline is the same.

## What students see

- A **Chapters** list on the lesson page's **Overview** tab, below the video and after the lesson description, with each chapter's start time and title.
- Clicking a chapter jumps the video to that time.

The lesson editor's **At a glance** panel shows how many chapters the live video has.

## Good to know

- You can only edit chapters for the live video. To prepare chapters for a replacement, publish it first, then add them.
- Chapters aren't shown as markers on the video's progress bar; they're the list below the video.
- Quiz lessons and lessons without a video have no chapters.