I built PISIGuard because I’ve been horrified at how much personal & sensitive information people (including myself) are feeding AI daily. It’s cumbersome to censor by hand, so few do it consistently. I wanted something practical that hides personal & sensitive data without routing them through another server.

The extension runs entirely in your browser. It spots names, email addresses, phone numbers, credit card numbers, passwords, API keys, and more; replaces them with safe placeholders; then puts the real values back into the AI’s reply. From your view, it’s mostly invisible; from the AI’s view, the sensitive stuff was never there.

All detection, masking, and restoration happen locally. No data is sent to an external service. The AI only sees placeholders. It works on popular AI chat platforms like Chat GPT, Claude, and Deep Seek. Minimal permissions: the extension only needs access to the sites you use it on, and no background processes run.

You can install PISIGuard from the Web Store or GitHub Releases, or build your own clone. The project is maintained by Codoma.tech. It’s a practical, open‑source solution for protecting personal data in AI conversations.