PiiBlocker: Mask & Redact Personal Data (PII) in AI Chats

Hides and anonymizes names, emails, cards and secrets before your prompt reaches ChatGPT, Claude or Gemini. 100% local, no servers.

STOP DATA LEAKS TO AI CHATBOTS People run their work through AI chats now. Contracts, emails, patient notes, spreadsheets. Everything you paste is stored on someone else's server. PiiBlocker masks, redacts and anonymises personal data, sensitive information and secrets before your prompt leaves your browser. Names, emails, phone numbers, addresses, credit card numbers, Social Security numbers, National Insurance numbers, API keys and passwords are detected as you type, replaced with placeholders like [PERSON_A], and swapped back in the reply. The AI only ever sees the placeholders. Detection and masking run locally. Free mode makes zero network calls. No account, no server, no usage limits. Watch the 60-second demo: https://www.youtube.com/watch?v=VpYqkC-_UVg SUPPORTED SITES PiiBlocker works on seven AI chat platforms, all free. The extension can read those seven sites and nothing else. See the screenshots for the full list, or visit https://www.piiblock.com If Chrome asks you to re-approve the extension after an update, that is expected when a version adds protected sites. Click Enable and protection resumes immediately. HOW IT WORKS 1. Type normally into any supported AI chat 2. PiiBlocker highlights detected personal data in real time 3. Before sending, choose what to mask, hide or keep in a confirmation dialog 4. Critical data like credit cards, SSNs and API keys is redacted automatically 5. The AI responds with placeholders, and PiiBlocker shows you the real data 6. Missed something? Select any text and right-click to mask it manually WHAT IT DETECTS (15+ TYPES) Credit card numbers with validation, Social Security numbers, API keys and secrets, passwords, names, addresses, phone numbers, emails, dates of birth, ages, salaries, medical conditions, bank account numbers, UK National Insurance numbers, and more. PRIVACY BY DESIGN Detection happens in your browser. In free mode your data never leaves your device and the extension makes zero network calls. AES-256 encrypted storage with auto-expiring keys. One-click purge of all stored data. WHO USES IT Lawyers protecting client confidentiality. Clinicians and practice staff keeping patient data out of AI tools. Developers redacting secrets and API keys from prompts. Anyone who wants to use AI at work without leaking personal information. FEATURES Real-time detection using NER and regex patterns. Auto-redaction for critical data. Right-click context menu for anything the detector missed. Placeholders swapped back in the AI's replies. Personal dictionary that learns your specific data. Works on all seven supported sites. Self-monitoring on every site, so silent breakage gets caught. Stays protected on long-running tabs. FREE CORE PROTECTION Core protection is free on all supported sites, with no account and no usage limits. An enterprise tier with managed deployment and an admin dashboard is available at https://www.piiblock.com/enterprise SUPPORT Website: https://www.piiblock.com Email: support@piiblock.com GitHub: https://github.com/piiblocker-coder/piiblocker