YouTube chapter format: the rules, with examples

YouTube's chapter parser only accepts a very specific format. Get one character wrong and the entire chapter list silently breaks — no error message, the markers just don't appear. This is the canonical reference for what works and what doesn't.

The rules

1. The first timestamp is always 0:00. No exceptions.
2. Minimum 3 chapters. Two-chapter lists are ignored.
3. Minimum 10 seconds per chapter. A chapter that ends less than 10 seconds after it starts breaks the list.
4. Chronological order. Going backwards anywhere invalidates everything after that point.
5. One chapter per line. No commas or pipes between chapters on the same line.
6. Plain timestamp at the start of the line. No brackets, parentheses, or labels in front of the time.

Example: short video (under one hour)

0:00 Intro
0:42 Why this matters
3:18 The 3-step framework
7:55 A worked example
14:02 Common pitfalls
18:30 Recap

Example: long video (one hour or more)

0:00 Cold open
2:14 Guest introduction
12:30 Early career
33:18 The pivot moment
1:02:45 Building the company
1:34:20 Lessons learned
2:11:00 Closing thoughts

Notice the format switches at the one-hour mark — it's 33:18 (m:ss) before the hour and 1:02:45 (h:mm:ss) after. YouTube handles both fine in the same list.

What breaks the format

These are the patterns we see most often when chapters mysteriously don't show up:

[0:00] Intro                ← brackets break parsing
0:00 - Intro                ← dash before title is fine, but consistency matters
00:00 Intro                 ← the leading zero is fine, but skip it for clarity
0:01 Cold open              ← first chapter MUST be 0:00
0:00 Intro
0:05 Topic                  ← chapter shorter than 10s
0:00 Intro
2:00 Middle
1:00 Wait what              ← out of order — list dies here

Where to put the chapter list

In your video's description box. YouTube reads the entire description looking for the pattern — the chapter block can sit at the top, the bottom, or in the middle of other text. Top placement is most common because viewers can find them faster when reading the description.

How to write chapter titles that perform

• 3–8 words. Anything longer gets cropped on mobile.
• Lead with the topic, not the structure. "Demo: live coding" beats "Section 3: demonstration."
• Avoid clickbait. Chapters that promise more than they deliver hurt watch time.
• Use specific nouns. "AWS Lambda cold starts" indexes better than "the slow part."

Generate the format automatically

Our YouTube Chapter Generator outputs chapters in YouTube's exact format every time. First timestamp 0:00, ≥10 seconds apart, chronological, no brackets — paste the URL and it's done.