How to Use This Tool
YouTube manual chapters can fail as a group even when most lines look correct. Paste exactly what you plan to place in the description. The validator checks the published requirements: the first timestamp starts at 00:00, there are at least three timestamps in ascending order, and every chapter lasts at least ten seconds.
The last chapter needs the video length
The gap between two timestamps reveals the earlier chapter's duration, but the final timestamp has no following line. Enter the full video length so the page can check that last segment too. Without it, a chapter beginning five seconds before the end may look valid even though it is too short.
Validation is not publication
A structurally correct list can still be unavailable when a channel lacks access to the feature, when active strikes affect eligibility, or when YouTube processing has not completed. This tool checks the text and timing only. YouTube Studio remains the authority on whether chapters appear.
Sources & assumptions
Tool Spec v2 · verified 2026-08-18. Platform rules and fees can change; the editable inputs remain authoritative for your account.
Official references
- YouTube Help — Video Chapters (checked 2026-08-18)
Model assumptions
- Video length is entered accurately because the page cannot inspect the video.
- Each non-empty line is expected to contain a timestamp followed by a visible chapter title.
