YouTube Chapter Marker
Paste one timestamped chapter per line. The browser keeps each title, sorts the chapters, and reports duplicate or YouTube chapter rule issues without uploading your notes.
Ready to review.
The result is a review aid; it does not claim YouTube acceptance.
A QUICK WALKTHROUGH
How to use this tool
- Paste lines containing M:SS or H:MM:SS timestamps and a chapter title.
- Review sorted chapters and any unparsed, duplicate, or rule-warning lines.
- Copy or download the formatted chapter list for your own review.
Local timestamp parsing
The browser finds M:SS or H:MM:SS timestamps anywhere in each non-empty line and keeps the remaining line text as the title. Lines without a valid timestamp are flagged for review.
Reviewable chapter rules
The tool reports whether the list starts at 00:00, has at least three chapters, contains duplicates, and keeps at least 10 seconds between neighboring chapters. Sorting makes the output ascending; warnings are guidance, not a claim that YouTube will accept the result.
Copy and download in your browser
Parsing, formatting, copying, and TXT download happen locally. Your pasted notes are not uploaded or stored by this page.
GOOD TO KNOW
Common questions
What timestamp formats are supported?
Use M:SS or H:MM:SS, with optional leading zeroes. A timestamp may appear anywhere in a line.
Does this guarantee YouTube will accept my chapters?
No. It checks common chapter rules and reports issues for review, but it does not submit to or validate against YouTube.
What happens to lines without timestamps?
They remain visible in the report as unparsed lines and are left out of the formatted chapter output until you fix them.