What must the first YouTube chapter timestamp be?

Manual chapters must begin at 00:00. The tool flags a chapter plan that starts at another time.

Why does the tool require at least three chapters?

YouTube's manual chapter structure requires at least three timestamps in ascending order. Each chapter should also be at least ten seconds long.

Does this tool create chapters from my video automatically?

No. It formats and validates timestamps you enter. Your video is not opened, transcribed or uploaded.

Can I use hour-long video timestamps?

Yes. Both mm:ss and h:mm:ss formats are accepted, and the output keeps the appropriate format.

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YouTube Chapters Generator

Format and validate manual YouTube chapter timestamps against video duration, ordering and minimum chapter requirements.

Free browser toolRuns in your browserNo sign-up

Ready to paste

6 chapters

The formatted block below is intended for the YouTube video description. Always confirm the timestamps against the final uploaded edit.

Valid chapters

Video duration

18:40

Validation

Passed

The chapter structure passes the current checks.

00:00 What this tutorial builds
00:42 Prepare the source data
03:18 Create the KPI cards
08:05 Add the trend chart
13:30 Build the final dashboard
17:50 Review and next steps

About the YouTube Chapters Generator

YouTube Chapters Generator turns a timestamp plan into the exact line-by-line chapter block used in a YouTube video description. Each row contains a start time and a specific label, so the finished output can be checked against the final edit before publishing.

The validator checks that the first chapter starts at 00:00, at least three valid chapters are present, timestamps move forward, chapter starts remain inside the entered video duration and adjacent chapters are not shorter than ten seconds. Invalid lines remain visible as actionable issues instead of being silently dropped.

The tool does not inspect or upload a video. Enter the duration and timestamps from your final exported edit, correct any validation messages, then paste the generated block into YouTube Studio.

Key features

Manual chapter formatting for YouTube descriptions
mm:ss and h:mm:ss timestamp support
Required 00:00 first-chapter validation
Minimum three-chapter check
Chronological order and duplicate-time detection
Video-duration boundary validation
Shorter-than-ten-second chapter warnings
Copy and TXT download
Private browser-only processing

How to use

1Enter the duration of the final edited video.
2Add one timestamp and chapter title per line using timestamp | title.
3Fix every red validation issue and review any short-chapter warning.
4Check the timestamps against the uploaded video, then copy the formatted block into its description.

Examples

Validate a tutorial chapter plan

Input: 18:40 video with six timestamps from 00:00 to 17:50

Output: A validated six-line chapter block ready for the video description

Compare every timestamp with the final uploaded edit before publishing.

Frequently asked questions

What must the first YouTube chapter timestamp be?: Manual chapters must begin at 00:00. The tool flags a chapter plan that starts at another time.
Why does the tool require at least three chapters?: YouTube's manual chapter structure requires at least three timestamps in ascending order. Each chapter should also be at least ten seconds long.
Does this tool create chapters from my video automatically?: No. It formats and validates timestamps you enter. Your video is not opened, transcribed or uploaded.
Can I use hour-long video timestamps?: Yes. Both mm:ss and h:mm:ss formats are accepted, and the output keeps the appropriate format.

Open a related tool to prepare your files or refine the finished result.