PseudoShield – Pseudonymize personal data before pasting into AI chats

Summary: PseudoShield is a free, open source browser extension for Chrome and Firefox that intercepts Ctrl+V on AI platforms and replaces personal data with deterministic pseudonyms. It detects 35 data patterns including names, IBANs, national IDs, emails, phones, and credit cards with math validation, ensuring data privacy before text reaches AI chatbots.

What it does

PseudoShield scans clipboard content on paste and substitutes personal data with consistent pseudonyms locally, without network calls or tracking. It supports platforms like ChatGPT, Claude, Gemini, Copilot, DeepSeek, and Perplexity, and includes a GDPR Art. 30 audit log.

Who it's for

It is designed for professionals such as lawyers, data protection officers, doctors, and accountants who need to protect sensitive client data when using AI chatbots.

Why it matters

It prevents accidental exposure of personal data to AI services by pseudonymizing sensitive information before input, supporting compliance and data privacy.