YouTube SEO Description + Chapters Generator — Lab Tools

Generate an SEO description with keywords and timestamped chapters from a video's captions. Free, no API key — copy the block.

Fill your YouTube "Description" box in one click — no API key, no sign-up, free. A good description is half of YouTube SEO: a clear summary, the keywords people search, and chapters with timestamps so viewers (and YouTube) can navigate your video. Writing all of that by hand is tedious, and most generators make you paste in your own paid OpenAI key. This one doesn't. Open your video, click the button, and get a ready-to-paste block built from the video's own captions. In this video we cover... [your AI-written summary] 0:00 Intro 1:24 First Topic 03:10 The Main Demo ... #yourtopic #howto #tutorial WHAT IT DOES • Writes an SEO-friendly description (2–3 short paragraphs) from the video's captions • Suggests natural keywords viewers actually search • Generates chapters with timestamps (first chapter at 0:00, as YouTube requires) • Optional hashtags from your keywords • One-click "Copy all" — the whole block, formatted for the Description box • Choose how many chapters: fewer/longer or more/shorter, and the caption language track • Works with manual and auto-generated captions WHY IT'S DIFFERENT • Free, and you never enter an API key or create an account. • Description AND chapters in one block — chapters are what the description actually needs for SEO. • Follows YouTube's chapter rules automatically: first chapter at 0:00, at least 3 chapters, each at least 10 seconds. GREAT FOR • Creators who want a search-friendly description without the busywork • Tutorials, how-tos, podcasts, interviews, lectures, long-form video • Anyone tired of tools that demand a paid API key HOW TO USE 1. Open a YouTube video that has captions. 2. Click the extension icon (or the on-page "SEO Description" button). 3. Press "Generate description". 4. Click "Copy all" and paste the block into your video's Description box. 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. • To write the text, that public transcript is sent to our Lab Tools service (on Cloudflare) and then discarded — we don't store or sell it. • Minimal permissions: the extension only acts when you click it. No host permissions beyond YouTube. 🛣️ ROADMAP — WHAT'S COMING NEXT We're actively building, and what we add next depends on you: • ✅ Available now: AI description, keywords, chapters, hashtags, one-click copy • 🔜 Description styles (concise / detailed / storytelling) • 🔜 Per-niche keyword tuning • 🔜 Bulk descriptions across a playlist • 🔜 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 just the chapters? Try our YT Chapters Generator. Need translated subtitles? Try Subtitle Auto-Translator.