Key takeaways
- 01Paste a YouTube URL and the tool reads public captions automatically — no API key or Google login needed.
- 02Upload an MP4, MOV, or WebM and Whisper transcribes the audio locally in your browser before writing chapters.
- 03Chapter titles are placed at real topic shifts, not arbitrary intervals, and always start at 00:00.
- 04The plain-text output pastes straight into YouTube Studio description box to activate the chapter scrubber.
Why YouTube Chapters Matter
Chapter markers do more than help viewers skip around. They show up as distinct search results inside Google and YouTube, give your video a progress-bar scrubber that improves watch time, and signal topic depth to the algorithm. The problem is that adding them by hand — watching your own video, noting every timestamp, then writing a title for each — takes longer than most people are willing to spend.
The YouTube chapters generator on Handytool removes that friction entirely. Give it your video's URL and it reads whatever captions YouTube already has. Give it an MP4 file and it extracts the audio, runs Whisper right in your browser, and writes chapters from the transcript. Either way the output is a clean list in the exact 00:00 Title format YouTube expects — ready to copy and paste.
How to Generate YouTube Chapters
The whole process takes under a minute for most videos.
- 01
Choose your input method
Open the tool and pick the URL tab to work with an existing YouTube video, or switch to the File tab if you want to generate chapters before publishing or if the video has no captions.
- 02
Paste the URL or upload the file
For the URL tab, paste any YouTube link — public or unlisted. For the file tab, drag and drop an MP4, MOV, or WebM up to 500 MB. Audio is extracted with FFmpeg.wasm entirely inside your browser.
- 03
Generate and review
Click Generate. The tool places chapter boundaries at genuine topic shifts and writes a short descriptive title for each. Review the list; if any title feels off, edit it directly in the output box.
- 04
Copy and paste into YouTube Studio
Copy the full chapter list, open YouTube Studio for your video, scroll to the description field, paste the list, and save. As long as the first entry is 00:00 and each chapter is at least 10 seconds long, YouTube enables the scrubber automatically.
Chapter Quality Checklist
Before you paste into YouTube Studio, confirm:
- 01The list starts with 00:00 followed by a title (e.g., 00:00 Intro).
- 02Each chapter is at least 10 seconds after the previous one.
- 03There are at least three chapters total (YouTube requires a minimum of three).
- 04Chapter titles are clear to a viewer who hasn't watched the video yet.
- 05Timestamps are in ascending order with no duplicates.
- 06The list is in the description, not in the comments or title.
Privacy and How Your File Is Handled
When you use the URL mode, only the YouTube video URL is sent to Handytool's server so the tool can fetch the public caption track and generate chapter titles. The video itself is never downloaded to or stored on the server.
When you upload a video file, the audio is extracted and Whisper transcribes it locally inside your browser tab. Only the resulting text transcript is sent for chapter title generation — the video file stays on your device the entire time. Handytool does not store transcripts, captions, or generated chapter lists.
YouTube Chapters Generator FAQ
Do I need a YouTube API key to use the chapters generator?
No. The tool reads the same public caption data YouTube serves to all viewers. You don't need an API key, a Google account, or any quota.
What if my video has no subtitles or captions?
Switch to the File tab, upload your video, and Whisper transcribes the audio locally in your browser. Chapters are generated from that transcript — no pre-existing captions required.
How long can my video be?
URL mode handles videos of any length that YouTube's transcript covers. File uploads are capped at 500 MB, which is usually more than enough for an hour of HD video.
Can I edit the chapter titles before copying them?
Yes. The output is plain editable text. Tweak any title that doesn't match your tone before pasting into YouTube Studio.
Does the tool support languages other than English?
Chapter titles are written in whatever language the Handytool interface is set to, so Spanish, Hindi, Japanese, and other language users get titles in their own language regardless of the video's language.
Why isn't the chapter scrubber showing on my video after I paste?
The most common reason is that the first timestamp is not exactly 00:00, or that there are fewer than three chapters, or a chapter is less than 10 seconds long. Check those three requirements and save the description again.