Why your chapters silently disappear
YouTube chapters fail closed: if any rule in your timestamp list is broken, the platform doesn't show an error or display the chapters it can parse — it ignores the entire list. Creators then re-save the description, wait, clear caches, and search "youtube chapters not working" without ever learning that the problem is, say, a single chapter that runs 8 seconds instead of 10. The rules themselves are mechanical and few: the list must begin at exactly 0:00, contain at least three timestamps, run in strictly ascending order, and give every chapter at least 10 seconds.
This validator checks all of them at once. Paste your full description — non-timestamp lines are ignored automatically, and common prefixes like dashes and bullets are tolerated — and each rule is graded with the specific offending line number. The fixed output panel rebuilds your list automatically: sorted into ascending order, duplicate timestamps removed, and a 0:00 intro inserted if your list doesn't have one. The player-bar preview shows how your chapters will divide the progress bar, with under-length chapters highlighted in red so you can see at a glance which segments need merging or re-timing.
Beyond just working, chapters earn search visibility: titles are indexed and can appear as Key Moments in Google results, and viewers who can jump to what they came for stay longer — which feeds your retention metrics. Use descriptive, keyword-bearing titles rather than "Part 1, Part 2" and the same list does double duty as navigation and SEO.
Frequently Asked Questions
Why are my YouTube chapters not working? ›
The four most common reasons: your list doesn't start with 0:00 (the #1 cause — YouTube ignores everything without it), you have fewer than three timestamps, the timestamps aren't in ascending order, or a chapter is shorter than 10 seconds. Paste your description into the validator above and it will tell you exactly which rule is broken and on which line.
What are YouTube's chapter requirements? ›
Four rules: the first timestamp must be exactly 0:00, you need at least three timestamps, they must be in increasing order, and every chapter must be at least 10 seconds long. Timestamps should each be on their own line in the video description, followed by the chapter title.
How do I add chapters to a YouTube video? ›
Edit your video's description and add a list of timestamps with titles, one per line, starting with 0:00 — for example: "0:00 Intro", "1:24 Setup", "5:10 Results". Save, and chapters appear in the player's progress bar within a few minutes. No special menu is needed.
Do YouTube chapters help SEO? ›
Yes, twice over. Chapter titles are indexed and can surface as "Key Moments" directly in Google search results, giving your video extra search real estate. They also improve viewer retention metrics by letting people jump to what they want instead of leaving — and retention feeds the recommendation algorithm.
How many chapters should a video have? ›
There's no upper limit, but practical guidance: one chapter per genuine topic shift, with descriptive keyword-bearing titles. For a 10-minute video that's typically 5–8 chapters. Avoid micro-chapters under 30 seconds except for the intro — they clutter the progress bar without helping navigation.
Why did YouTube's automatic chapters replace mine? ›
If your manual list breaks any rule, YouTube falls back to its automatic chapters (if enabled). Fix your description list with the validator, and your manual chapters take priority again. You can also turn off automatic chapters in YouTube Studio under Show more → Automatic chapters.