Audio / Video

YouTube Chapter Timestamp Validator

Check and format YouTube chapter timestamps so chapters show up.

Audio / Video

Local only

Chapter lines

Everything stays in your browser

Your text is processed on your device — nothing is uploaded to a server.

How it works

Accepts “0:00 Title”, “Title - 0:00” or “[0:00] Title”. Checks YouTube's rules: starts at 0:00, at least 3 chapters, each at least 10 seconds.

Good to know

How do I use it?

Enter your chapter lines and press “Validate”. Check the result, then copy or download it.

How does it work?

Accepts “0:00 Title”, “Title - 0:00” or “[0:00] Title”. Checks YouTube's rules: starts at 0:00, at least 3 chapters, each at least 10 seconds.

Is my data uploaded?

No. Everything is processed in your browser and nothing is sent to a server. No account is needed.