PseudoShield

PseudoShield is a free and open-source browser extension designed to protect sensitive personal data when using AI chatbots. It helps professionals and individuals use AI tools like ChatGPT, Claude, and Gemini without worrying about their private information being exposed.

Benefits

PseudoShield automatically replaces personal information with generic labels before it is sent to an AI. This means details like names, national ID numbers, bank account numbers, and email addresses are changed into placeholders such as [Personne1], [NISS1], or [IBAN_1]. This process, called pseudonymization, ensures that sensitive data stays within your browser and does not reach the AI provider. It helps users comply with privacy rules like GDPR and maintain professional secrecy.

Use Cases

This tool is ideal for professionals who deal with confidential information daily and want to use AI assistants. This includes lawyers, doctors, accountants, Data Protection Officers, and HR professionals. It can be used whenever you need to paste text containing personal data into supported AI platforms such as Claude.ai, ChatGPT, DeepSeek, Gemini, Copilot, and Perplexity.

Vibes

The project encourages user feedback to improve its detection capabilities, especially for postal addresses. It is noted that a part of the code was created with AI assistance, and while it works well, some minor issues might exist.

Additional Information

PseudoShield is available for free on Google Chrome and Mozilla Firefox. Its source code is also publicly accessible. The extension uses the Web Crypto API for local processing, meaning no network calls are made, and there are no user accounts or data tracking.