Auto-format video timestamps into YouTube-compliant chapters (00:00 start required).

How to use

1. Paste timestamps (one per line or comma-separated).
2. Fix/normalize happens automatically.
3. Copy the YouTube-ready block.

About this tool

YouTube chapters need a strict format — they start at 00:00, use M:SS or HH:MM:SS, and sit in the description. Paste timestamps in any messy style (2:15, 02:15, 1h2m3s) and this generator normalizes them, adds the required zero-start if missing, checks they are ascending, and outputs a ready-to-paste block. Chapters boost watch time and search snippets, so this is a five-minute fix every uploader should run. Your file never leaves this page — processing runs in your browser via WebAssembly; nothing is uploaded and the file is dropped from memory when you close the tab.

FAQ

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