The rules YouTube uses for chapters
Chapters split a video's progress bar into labelled sections, so viewers can see what's coming and jump straight to the part they want. When you write the timestamps in the description yourself, YouTube only turns them into chapters if the list follows its published requirements:
- The first timestamp is 0:00 (or 00:00).
- There are at least three timestamps.
- The timestamps are listed in ascending order.
- Every chapter is at least 10 seconds long.
Timestamps you add yourself replace the automatic chapters YouTube sometimes generates. If even one rule is broken, you usually get no chapters at all, just clickable timestamps in the description, which is why it's worth checking before you publish.
Why chapters don't show up, and how to fix it
Nearly every broken chapter list comes down to one of these:
- The list starts at 0:05 or 0:10. The opening chapter must begin at zero. If it's close, move it to 0:00; if the intro really starts later, add a short “Intro” chapter at 0:00 instead.
- A chapter is too short. A quick “Outro” in the last few seconds, or two timestamps a few seconds apart, breaks the 10-second rule. Remove the short chapter so the one before it runs longer.
- The last chapter runs past the end. After a re-edit, old timestamps can point beyond the video's new length. Add the video length to catch this, the video info tool shows it to the second.
- Only two chapters. Split a long section in two, or add an intro.
- A typo in a time.
1:5or12;30isn't a timestamp YouTube recognises. Lines without a readable time are listed under the box so nothing is silently ignored.
Formatting that reads well
Put each chapter on its own line with the time first, followed by a short, specific title, “Setting up the mic” tells viewers more than “Part 3”. For videos under an hour, M:SS (like 4:30) is the norm; once a video passes the hour mark, write every timestamp as H:MM:SS so the list lines up.
The output always uses one consistent format, whatever you pasted. Choose padded times (04:30) if you prefer them, and pick the separator you like between time and title: a space, a hyphen, an en dash or a vertical bar all work.
Your full description can hold up to 5,000 characters; check it, along with your title, in the character counter. Planning the video before you shoot? The script timer estimates how long each section will run.