📺 YouTube Transcript Assistant (AI Summary & Export)

A lightweight, privacy-focused Greasemonkey/Tampermonkey userscript that extracts YouTube transcripts directly from your browser session. It allows you to save timestamped transcripts as .txt files or send them to an LLM (via OpenRouter/OpenAI) for an instant, beautifully formatted HTML summary directly on the page.

✨ Features

• Bot-Detection Proof: Uses your actual browser session to fetch transcripts, avoiding the IP bans common with CLI tools and scrapers.
• AI Summarization: Sends cleaned transcripts to your choice of LLM (GPT-4, Claude, Gemini, etc.) via OpenRouter or any OpenAI-compatible API.
• In-Page UI: Displays summaries in a native-looking, toggleable, and copyable box above the video description.
• Clean Export: Download timestamped transcripts as .txt files with sanitized filenames based on the video title.
• Customizable: Configure your API URL, Key, and Model name directly via a settings gear in the UI.
• Dark Mode Ready: UI elements use YouTube's native CSS variables to match your theme.

🚀 Installation

1. Install a userscript manager like Greasemonkey (Firefox) or Tampermonkey (Chrome/Edge).
2. Create a new script in your manager.
3. Copy the code from youtube-transcript-helper.user.js and paste it in.
4. Save the script and refresh any YouTube video page.

⚙️ Configuration

Once installed, a new set of buttons will appear near the "Subscribe" button on YouTube:

1. Click the Settings (⚙️) icon.
2. Enter your API URL (e.g., https://openrouter.ai/api/v1/chat/completions).
3. Enter your API Key.
4. Enter the Model ID (e.g., stepfun/step-3.5-flash:free or nvidia/nemotron-3-super-120b-a12b:free).

🛠️ Technical Details

• Language: JavaScript (ES6+)
• Permissions: Uses GM.xmlHttpRequest for cross-origin API calls and GM.setValue/GetValue for secure local storage of API keys.
• Compatibility: Optimized for the 2026 YouTube "View Model" UI update.

📝 License

Distributed under the MIT License. See LICENSE for more information.