YouTube Chapters

Transform YouTube videos into structured chapters and concise key points with clickable timestamps — built directly into the player.

YouTube Chapters is a lightweight, privacy-focused Chrome extension that automatically extracts video transcripts and generates structured chapters and bullet summaries. It helps you save time, navigate long videos instantly, and dive deep into content without leaving YouTube.

Why This Extension?

Native Player Overlay & Side Panel

Displays clickable timestamp chapters directly on the native YouTube player overlay as well as in Chrome's side panel, making video navigation effortless.

Instant Chapter Generation

Quickly breaks down lengthy talks, lectures, tutorials, and podcasts into logical chapters and level-2 detailed sub-points.

Privacy-First & Direct API

All transcript processing happens locally in your browser. API credentials and preferences are stored safely in chrome.storage.local or local configuration, connecting directly to AI providers with no middleman server tracking.

Multi-Language & Custom Prompts

Optimized built-in prompts for 10+ languages (English, Chinese, Japanese, Korean, German, French, etc.) with support for Deep Dive analysis and custom AI prompts.

Key Features

• Structured Chapters with Timestamps — Auto-generate clickable timestamps that jump directly to specific video moments
• Native Player Integration — Custom overlay with frosted glass design embedded seamlessly in YouTube
• Chrome Side Panel Support — Access settings, model switches, and summaries from Chrome's side panel
• Multi-Provider AI Support — Compatible with OpenAI, DeepSeek, Gemini, and Portkey Gateway
• Deep Dive Analysis — Conduct comprehensive AI breakdowns on specific video sections
• Subtitle Interceptor — Automatically captures official or auto-generated YouTube captions
• Customizable UI — Adjustable overlay position, dimensions, font size, and timestamp formatting
• Zero Account Tracking — Operates client-side without collecting personal user analytics

How It Works

1. Install & Open: Load the extension and open any YouTube video with available captions.
2. Generate Chapters: Click the summary button on the video player overlay to instantly generate structured chapters.
3. Navigate Video: Click any timestamp in the generated list to jump straight to that moment in the video.
4. Customize: Open the Side Panel to switch AI models, adjust display parameters, or modify prompt templates.

Use Cases

• Students & Researchers — Quickly skim through long lectures and extract core study topics with exact timestamps.
• Podcasts & Talk Viewers — Navigate 1-2 hour interviews to find specific topics instantly.
• Developers & Tech Enthusiasts — Skip straight to coding demos and technical step-by-step chapters in video tutorials.
• Content Creators — Generate structured video chapters for video descriptions and show notes.

Technical Overview

• Manifest Version: Manifest V3 (Chrome Extension Standard)
• Interceptor: Main-world script intercepting YouTube timedtext API calls
• Architecture: Content scripts + Background Service Worker + Chrome Side Panel
• API Support: OpenAI API standard format & Portkey Gateway
• Storage: chrome.storage.local
• Permissions: storage, sidePanel, host permissions for youtube.com

Version: 1.2.0 — Open Source

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