Prompt Privacy Guard

About

Automatically pseudonymize inputs and prompts sent to LLMs such as ChatGPT, Claude, Gemini, and Copilot. Unlike other plugins where users often forget to activate protection or manually select text, this extension works automatically when you hit “send.” Manual control is also available if needed.

It pseudonymizes sensitive data including first and last names, addresses, IDs, IBANs, and dates — with optional reversible session-based mappings.

Designed with a strong focus on German data formats and privacy requirements, it also works reliably with data from other countries.

All processing is done 100% locally. Your data never leaves your device — no accounts, tracking, or cloud services required.

Completely free.