PISIGuard: Protect your personal and sensitive info when you chat with AI

PISIGuard is a browser-based tool that automatically detects and masks sensitive personal information—such as names, emails, phone numbers, and API keys—before users send messages to AI chatbots, replacing them with safe placeholders. The masked data is restored in the AI's response so users can read naturally, while the AI only ever sees the placeholders, with all processing happening locally without sending data to external servers. The tool aims to prevent users from inadvertently sharing personal and sensitive information with AI services.