PISIGuard: AI Chat Privacy Shield That Masks Your Data Locally
PISIGuard: Protect your personal and sensitive info when you chat with AI
PISIGuard is a browser extension that automatically detects and masks personal and sensitive information—names, emails, phone numbers, credit card numbers, passwords, API keys—before you send messages to AI chatbots like ChatGPT, Claude, and DeepSeek. It replaces sensitive data with placeholders, then restores the original values in the AI's response. All processing happens locally in your browser, so no data is sent to external servers. The extension is configurable for advanced users and available for Chrome, Edge, Firefox, and other browsers.
From your point of view, it’s mostly invisible; from the AI’s point of view, the sensitive stuff was never there.