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Website Highlight Saver

A Chrome extension that allows users to highlight and save text from any webpage with local storage and AI-powered summarization. Built with a modular, performance-optimized architecture.

Repository

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Live Demo
Rajat Mehra

Rajat Mehra / 2025-08-28

3 min read • 456 characters

Overview

Website Highlight Saver is a powerful Chrome extension that revolutionizes how you capture and organize information from the web. Built with vanilla JavaScript and Chrome Manifest V3 APIs, it enables users to highlight important text on any webpage, save highlights locally, and generate AI-powered summaries for better understanding and retention.

🎬 Working Demo

Website Highlight Saver - A powerful Chrome extension for highlighting and saving text from any webpage

Watch the extension in action: Select text, save highlights, and navigate between them seamlessly.

The extension provides a seamless highlighting experience with an intuitive popup interface that appears below your text selection, offering three key actions: Summarize, Save, and Cancel.

✨ Key Features

Core Functionality

  • Universal Text Selection: Highlight any text on any webpage with instant visual feedback
  • AI-Powered Summarization: Get intelligent summaries using OpenAI's GPT models
  • Smart Popup Interface: Clean, minimal popup with smooth animations and smart positioning
  • Local Storage: Secure local storage using Chrome's storage API with cross-session persistence

Advanced Features

  • Search & Filter: Powerful search through saved highlights by text, domain, or title
  • Export/Import: Backup and restore highlights as JSON files
  • URL Navigation: Direct navigation to specific highlights via URL fragments
  • Visual Indicators: Saved highlights marked with yellow background for easy identification
  • Responsive Design: Works seamlessly across desktop and mobile browsers

Performance & Reliability

  • 🚀 Performance Optimized: Intelligent caching, memory management, and batch DOM operations
  • 🛡️ Error Recovery: Robust fallback mechanisms and graceful error handling
  • 🧠 Smart Caching: Caches text nodes and AI responses to avoid duplicate processing
  • ⚡ Memory Management: Automatic cleanup of caches and temporary data

User Experience

Intuitive Workflow

  1. Select Text: Highlight any text on any webpage
  2. Action Popup: Minimal popup appears with clear action buttons
  3. Choose Action: Summarize with AI, save for later, or cancel
  4. Visual Feedback: Instant confirmation and persistent highlighting

Smart Features

  • Auto-positioning: Popup intelligently positions to avoid screen edges
  • Loading States: Clear feedback during AI processing
  • Auto-close: Popups close automatically after appropriate delays
  • Hover Effects: Interactive elements with smooth transitions

Data Management

Storage Strategy

  • Uses Chrome's chrome.storage.local API for persistent storage
  • Stores highlights with rich metadata (URL, title, domain, timestamp)
  • Automatic cleanup of old highlights (1-year retention)
  • Storage capacity: 5MB supporting ~10,000 highlights

Technical Highlights

Performance Features

  • Text Node Caching: Intelligent DOM text node caching for faster operations
  • Chunk Processing: UI-responsive processing of large highlight sets
  • Batch Operations: Optimized DOM manipulations
  • Memory Management: Automatic cleanup prevents memory leaks