Grammar Assistant - AI Editor & Writing Tool

Free offline AI grammar checker & writing assistant. WebGPU-powered, 100% private. Supports 5 languages. No cloud, no subscription.

Grammar Assistant is a professional, privacy-first AI writing companion that runs entirely offline in your browser. Powered by WebGPU and advanced local AI models, it corrects grammar, refines style, and extracts text from images—all without sending a single word to external servers. WHY CHOOSE GRAMMAR ASSISTANT? • 100% Private & Offline - Your text never leaves your device. No tracking, no cloud uploads, no data collection. • Free Forever - No subscriptions, no API costs. Runs on open-source local AI models. • WebGPU Accelerated - High-performance grammar checking using your computer's GPU. • Works Everywhere - Context menu, keyboard shortcuts (Cmd/Ctrl+Shift+E), and dedicated side panel. • OCR Text Extraction - Extract and correct text directly from images using built-in OCR technology. MULTI-LANGUAGE SUPPORT Optimized for English, Russian, German, Spanish, and French with automatic language detection to ensure accurate corrections in your preferred language. 5 PROFESSIONAL WRITING STYLES • Standard - Natural, everyday corrections • Formal - Professional business tone • Academic - Scholarly writing with precise language • Simple - Clear, easy-to-read sentences • Casual - Relaxed but polished tone POWERFUL AI MODELS (YOUR CHOICE) Select from 5 high-performance local models optimized for grammar correction Models download once to your browser cache (~1-5 GB) and run completely offline afterward. KEY FEATURES Smart Correction Workflow: • Real-time AI-powered grammar and style suggestions • Side-by-side diff view showing all changes • Detailed explanations for every correction • One-click copy to clipboard OCR from Images: • Upload screenshots or photos • Extract text automatically using Tesseract.js • Apply AI corrections to extracted text Theme Support: • Light, dark, and system-based themes • Persistent preferences across all tabs Advanced Technology: • Streaming responses for instant feedback • Web Workers for smooth UI performance • Intelligent caching for faster subsequent corrections • Automatic language mismatch detection HOW TO USE 1. First Launch: Click the extension icon and select your preferred AI model from settings. The model downloads automatically to your browser (one-time setup, ~1-5 GB depending on model). 2. Quick Corrections: Select any text on a webpage → Right-click → Choose "Correct with Grammar Assistant" (or press Cmd/Ctrl+Shift+E). 3. Side Panel Workflow: Open the side panel to type or paste text, select your writing style (Standard, Formal, Academic, Simple, or Casual), and click "Run AI" for instant corrections with detailed explanations. 4. OCR from Images: Open the side panel → Switch to the OCR tab → Upload an image → Extract text → Apply AI corrections. 5. Offline Ready: Once downloaded, models run completely offline—perfect for sensitive documents or working without internet. PERFECT FOR: • Writers, students, and professionals • Non-native English speakers • Privacy-conscious users • Offline workers and travelers • Anyone who needs fast, accurate grammar checking PRIVACY POLICY Zero data collection. Zero tracking. Zero cloud processing. Your text is processed locally on your device and never transmitted to external servers. Open-source models. No cookies. No telemetry.