Mask AI - PII Detection for AI Chatbots

Detect and mask sensitive data before pasting into ChatGPT, Claude, or Gemini. 100% client-side.

Mask AI is the privacy layer between you and ChatGPT, Claude, or Gemini. Every time you paste a document, an email, a contract, or a customer record into an AI chatbot, you might be sending sensitive personal data to a third party. Mask AI detects that data and lets you replace it with placeholders before sending — all in your browser, with no data uploaded to any server. ═══════════════════════════════════════ HOW IT WORKS ═══════════════════════════════════════ 1. Type or paste text in ChatGPT, Claude, or Gemini. 2. The Mask AI icon shows the count of detected sensitive items. 3. Click the icon → "Mask & Copy". The masked version is copied to your clipboard. 4. Paste (Ctrl+V / ⌘V) into the chat — your masked, AI-safe text replaces the original. ═══════════════════════════════════════ WHAT GETS DETECTED ═══════════════════════════════════════ • People's names (Compromise.js NER) • Email addresses • Phone numbers (US, UK, JP, AU, EU formats) • Social Security Numbers (SSN) • Credit card numbers (Visa, Mastercard, Amex) • Bank account numbers, IBAN, routing numbers • Passport, driver's license, VIN • Street addresses • Organizations and place names • 20+ entity types in total ═══════════════════════════════════════ PRIVACY-FIRST BY DESIGN ═══════════════════════════════════════ ✓ 100% local — detection runs in your browser via JavaScript ✓ Nothing is uploaded to our servers (verify yourself in DevTools → Network) ✓ No account required, no tracking, no cookies ✓ Open about how it works — full Privacy Policy at https://mask-ai.app/privacy ═══════════════════════════════════════ WHO IT'S FOR ═══════════════════════════════════════ • Lawyers redacting client information before AI summarization • Healthcare workers anonymizing patient notes for HIPAA compliance • Developers stripping API keys and internal URLs from code snippets • Compliance officers for GDPR / CCPA workflows • Anyone who pastes private documents into AI tools ═══════════════════════════════════════ ALSO AVAILABLE ═══════════════════════════════════════ The full web tool at https://mask-ai.app offers more control: review every detected item, customize replacements, mask custom terms, export to CSV, and more. Source code transparency and questions: hello@mask-ai.app