PiiBlocker

PiiBlocker is a free Chrome extension that detects and masks personally identifiable information (PII) before it reaches AI chatbots like ChatGPT, Claude, and Gemini. All processing happens 100% locally in your browser with no servers and no data collection. The extension scans text in real-time as you type, highlighting detected PII. Before your message is sent, a confirmation dialog shows what was found. Critical data like credit cards, SSNs, API keys, and passwords are auto-masked. Soft PII like names, addresses, and phone numbers are flagged for you to decide. The AI receives placeholder tokens like [PERSON_A] and [CREDIT_CARD_1] instead of your real data. When the AI responds, PiiBlocker swaps the placeholders back so you see your original information seamlessly. PiiBlocker detects 15+ types of PII including credit card numbers, Social Security numbers, API keys, passwords, names, addresses, phone numbers, email addresses, dates of birth, medical conditions, salary information, bank account numbers, and UK National Insurance numbers. Key features: NER-based contextual detection combined with regex pattern matching, auto-masking for critical data, right-click manual masking for anything automation misses, personal PII dictionary, AES-256 encrypted storage with auto-expiring mappings, and one-click purge. Free forever with no usage limits and no account required. Built by PiiBlock.