YouTube Timestamps Generator

Timestamps in a YouTube description do more than help viewers skip around. Once your description has three or more timestamps starting at 0:00 — YouTube's actual requirement — YouTube turns them into chapters: named, clickable segments on the progress bar that also feed the 'key moments' shown in search results. The problem is producing the list. For a 40-minute video that means scrubbing end to end, noting every topic change, and typing out each time by hand — and one wrong minute mark sends viewers to the middle of the wrong segment.

Castmagic builds the list from the video itself. Paste a YouTube URL (or upload the video file before you publish), and the audio is transcribed with word-level timestamps. The AI detects where the conversation changes topic and emits the chapter list in YouTube's exact format — 0:00 Intro, 4:23 First topic, and so on. Copy the block, paste it into your video description, and YouTube does the rest.

How YouTube chapters actually work

YouTube chapters are driven entirely by the text in your video description. When the description contains a list of timestamps and the list meets YouTube's rules — at least three timestamps, with the first at exactly 0:00 — YouTube segments the progress bar into named chapters. Viewers can click between them, see the chapter name as they scrub, and jump straight to the section they want. Chapter titles can also surface as 'key moments' in Google and YouTube search results.

That means adding chapters never requires re-editing or re-uploading the video. It's a text edit: produce the timestamp list, paste it into the description, save. Castmagic's job is producing that list accurately, so the only manual step left is the paste.

What the generated timestamps look like

The output is a plain text block in YouTube's expected format: 0:00 Intro, then a line per chapter — timestamp followed by a short descriptive title. Timestamps come from the word-level transcript, so each chapter starts at the moment the topic actually changes, not a rounded guess. Titles are written from what's said in that segment, which makes them specific enough to be useful in search rather than generic labels like 'Part 2'.

Published video or pre-publish upload — both work

For videos already on YouTube, paste the URL and Castmagic pulls the audio for transcription. For videos still in production, upload the file directly and generate the chapter list before launch, so the video goes live with chapters from its first view. Either route also gives you the full transcript — downloadable as TXT, SRT, VTT, PDF, DOCX, or CSV — and access to the rest of the content presets.

Beyond timestamps: the rest of the video package

The transcript that produces your timestamps can produce the rest of the publishing checklist too. Castmagic's presets generate a video description draft, title options, a summary, pull-quotes, and social posts from the same source — so the chapter list is the entry point, not the whole story. Podcasters publishing video versions of episodes get double duty: the same chapter list works in podcast apps that support chapters and in the YouTube description.

What this tool does and does not do

To be precise: Castmagic generates the timestamp text block. It doesn't modify your YouTube video, edit your description for you, or post anything to YouTube — you stay in control of your channel. You copy the generated block and paste it into the description yourself, which takes about ten seconds and works for any video you can edit.