YouTube Transcript & AI Summary

• Instantly display YouTube video transcripts
• Support for multiple language subtitles
• Easy-to-read display with timestamps
• No usage limits - completely free

🎬 Video Overlay Subtitles

• Display subtitles directly on the video player
• Show full transcripts separately from YouTube's built-in captions
• View the entire transcript while watching videos
• Toggle on/off with one click
• Add subtitles to videos that don't have captions

🤖 Flexible AI Integration

• ChatGPT - Instant summaries with temporary chat
• Gemini - Customizable prompts
• OpenAI API (GPT-4o, GPT-4o-mini)
• Anthropic API (Claude 3.5 Sonnet)
• OpenRouter (multiple models including free options)
• Local LLM Support - Works with Ollama, LM Studio, and any OpenAI-compatible local LLM
• Custom API - Support for any OpenAI-compatible endpoint

🌐 On-Device Translation

• Powered by Chrome AI Translation API
• Privacy-protected (no external data transmission)
• Fast, free, and works offline
• No usage limits
• Translated subtitles can also be displayed as video overlays

💾 Convenient Export Features

• One-click copy of transcripts
• Download as text files
• Optional timestamps

🎨 User-Friendly Design

• Automatically adapts to YouTube's theme (including dark mode)
• Intuitive and modern interface
• Full support for Japanese and English

🔒 Privacy-Focused

• No login or account registration required
• API settings securely stored locally
• Minimal permissions required
• No data sent to external servers

📋 How to Use

1. Open a YouTube video page 2. Click the extension icon below the video 3. Transcript automatically extracted and displayed in modal 4. Use "Copy", "Translate", "Show on Video", or "AI Summary" features

Video Overlay Subtitles:

• Click the "Show subtitles on video" button in the modal
• The extracted transcript will be displayed on the video player
• View the full text while watching the video

To use AI summaries:

• ChatGPT/Gemini: Use directly in browser (free)
• API usage: Set up API key in options
• Local LLM: Configure custom API endpoint with your local server URL (e.g., http://localhost:11434)

🎓 Perfect For

• Quickly understanding key points from long lectures or seminars
• Understanding videos in foreign languages (with translated subtitles)
• Using video content for notes or reports
• Efficient information gathering
• Utilizing video content for research and learning
• Privacy-conscious users who prefer local LLM processing
• Unlimited use without worrying about API costs
• Adding subtitles to videos without captions
• Viewing subtitles in a more readable format than YouTube's auto-captions

💡 Technical Specifications

• Latest Chrome extension compliant with Manifest V3
• Chrome 130+ recommended (for Chrome AI features)
• Lightweight and fast performance
• Secure storage management
• Full OpenAI-compatible API support

🌟 Completely Free & Open Source

Basic features (transcript extraction, translation, copy, download, video overlay display) are completely free with no usage limits. AI summary features are available with ChatGPT/Gemini browser versions (free), API keys from various providers, or local LLMs.

📢 Support & Feedback

For questions, bug reports, and feature requests, please visit our GitHub repository.

🔧 Local LLM Setup Examples

Compatible with all local LLM tools that provide OpenAI-compatible APIs, including Ollama, LM Studio, LocalAI, Jan, and text-generation-webui. Simply configure the custom API endpoint with your local server address to start using.

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Take your YouTube viewing experience to the next level with this Chrome extension! Install now and save time while learning efficiently.