YouTube Chapter Builder guide

Mark, validate and export video chapters with precise timestamps.

Use the guide alongside the working tool.

A valid 100-second chapter outline

00:00 Introduction
00:30 Demonstration
01:20 Review and next steps

For a 100-second video, these chapters last 30, 50 and 20 seconds. All exceed ten seconds. Using only the three start times without the full video duration cannot verify the final chapter's length.

Create and export

Add chapter titles and timestamps, import timestamped text/CSV/JSON, or load a video and mark moments while watching.

Review the timeline checks: first chapter at 00:00, at least three chapters and at least ten whole seconds per chapter. Supply the full duration to check the final chapter too.

Sort when appropriate, copy the timestamped list or download TXT, CSV or JSON. Platform eligibility and chapter display still depend on YouTube.

Methods and limits

Manual chapters normally need a 00:00 start, at least three chapters and at least 10 seconds per chapter. Final chapter length is checked only when duration is supplied. Platform eligibility and automatic chapter display are not guaranteed. CSV, JSON and timestamped lines accepted, up to 100 chapters.

Local processing

Files and inputs stay in browser memory. Only the shared media engine is downloaded when needed; no media is uploaded. Exported files contain the content you select. Refreshing clears this workspace.

Ready to apply this workflow?

Try YouTube Chapter Builder →

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All practical guides →

Keep your original files and review the result. Found unclear instructions? Contact Team Edtoolkits.