About YouTube Timestamp Generator
Chapters make a long video easier to navigate, but YouTube only turns a timestamp list into chapters when the format is right: one timestamp per line, a title after each time, no duplicates and no going backwards. Pasting timestamps from a script or a recording tool and fixing them by hand is tedious, and it is easy to get slightly wrong.
This formatter parses lines such as 0:00 Intro and 1:23:45 Setup, converts them to a consistent m:ss or h:mm:ss format, and checks the list for duplicates, out-of-order timestamps and missing titles. It also flags the common YouTube requirements, including at least three chapters, the first at 0:00 and roughly ten seconds between chapters, before you copy the block or download it as a text file.
What this tool does
Tolerant timestamp parsing
Accepts 0:00, 00:00, 1:23:45 and a title after the time with or without a dash.
Ordering validation
Timestamps must increase; duplicates and lines that go backwards are reported with the line number and the original text.
Normalized output
Every line is rewritten as m:ss or h:mm:ss, so the block pastes cleanly into a video description.
Chapter rule warnings
Flags a first chapter that is not 0:00, fewer than three chapters, and sections shorter than ten seconds.
Copy or download
Copy the chapter block to the clipboard or save it as a .txt file for a description draft.
Live line-by-line errors
Problems appear as you type and quote the offending line, making the fix obvious in a long list.
How to use YouTube Timestamp Generator
- 01
Paste the timestamp list
Use one chapter per line, starting each line with a time such as 0:00 or 1:02:03, followed by the chapter title.
- 02
Fix the reported lines
If a line is malformed, duplicated or earlier than the previous chapter, the error names the line number and shows the text to correct.
- 03
Review the warnings
Warnings cover YouTube's display rules, such as starting at 0:00 and having at least three chapters of ten seconds or more.
- 04
Check the normalized block
The output rewrites every timestamp consistently so the block is ready to paste into a description.
- 05
Copy or download
Press Copy chapters for the clipboard, or Download .txt to save the formatted block as a text file.
How this tool works
- Works with
- Chapters
- Processing
- Client-side, in your browser. Nothing is uploaded.
- Requirements
- Chrome, Edge, Firefox or Safari · JavaScript enabled
Limitations worth knowing
- The tool formats and checks timestamps; it cannot upload them or verify a video's actual chapter boundaries.
- The 0:00, three-chapter and ten-second YouTube rules are reported as warnings rather than enforced by blocking the output.
- Offsets such as 1:90 are rejected rather than silently converted; write 2:30 instead.
Privacy and file handling
Timestamp lists are parsed and validated in your browser with JavaScript. Nothing you paste is uploaded, stored or logged, and no request is made to a server while you format chapters.
Read the full privacy policy