YouTube AI Chapters & Timestamp Generator — Lab Tools

Add chapters to your YouTube videos in one click — no API key, no sign-up, free. Chapters (the timestamps in a video's description and progress bar) help viewers navigate and boost your SEO — but writing them by hand is tedious, and most tools make you paste in your own paid OpenAI key. This one doesn't. Open your video, click the icon, and get a clean, ready-to-paste chapter list built from the video's captions. 00:00 Intro 01:24 First Topic 03:10 The Main Demo ... WHAT IT DOES • Generates chapters with timestamps from any YouTube video that has captions • AI-written titles — clear, descriptive section names, free, no API key required • NEW — long videos supported: podcasts, lectures and streams get chapters across the WHOLE video, not just the start • One-click copy of the whole block, formatted for your description (first chapter at 0:00, as YouTube requires) • Choose how many chapters: fewer/longer or more/shorter • Pick the caption language track • Works with manual and auto-generated captions WHY IT'S DIFFERENT • Free, and you never enter an API key. • Follows YouTube's chapter rules automatically: first chapter at 0:00, at least 3 chapters, each at least 10 seconds. • If the AI engine is busy or offline, it falls back so you still get chapters. GREAT FOR • Creators who want navigable, SEO-friendly chapters without the busywork • Long-form video, tutorials, podcasts, interviews, lectures, streams • Anyone tired of tools that demand a paid API key Whether you call it a YouTube chapter generator, timestamp generator, chapter marker maker, or a video table of contents — this adds chapters to your description in one click, free, with no API key. HOW TO USE 1. Open a YouTube video that has captions. 2. Click the extension icon. 3. Press “Generate chapters”. 4. Click “Copy chapters” and paste the block into your video's description. If a video has no captions, you'll get a clear message — nothing breaks. PRIVACY • We never collect your account data, watch history, or identity. • Only the video's PUBLIC captions are used. • For AI titles, that public transcript is sent to our Lab Tools service (on Cloudflare) to write the titles, then discarded — we don't store or sell it. Prefer fully local? Switch to the on-device or Basic title engine and nothing leaves your browser. • Minimal permissions: the extension only acts when you click it. No host permissions. 🛣️ ROADMAP — WHAT'S COMING NEXT We're actively building, and what we add next depends on you: • ✅ Available now: AI chapters, density control, language picker, one-click copy • 🔜 SEO keyword hints inside chapter titles • 🔜 Bulk chapters across a playlist or channel • 🔜 More interface languages ⭐ HELP US BUILD IT If this saves you time, please leave a rating and a short review — it tells us people want this and decides what we build next. Got a request? Drop it in a review. Thank you! 🙏 Part of Lab Tools — simple, free utilities for YouTube creators. Need the full transcript instead? Try our YT Transcript Extractor. Need translated subtitles? Try Subtitle Auto-Translator.