Promptshield

PromptShield — Protect Your Sensitive Data on ChatGPT

Ever accidentally pasted a credit card number, API key, or Social Security Number into ChatGPT? PromptShield catches it before it's sent.

PromptShield is a lightweight privacy extension that monitors your ChatGPT input in real-time and blocks sensitive information from being submitted. If it detects something risky, it stops the message and shows you exactly what was found; so you can edit it yourself or let PromptShield automatically redact it for you.

🛡️ WHAT IT DETECTS:

Credit Card Numbers — validated using the Luhn algorithm to reduce false positives
Social Security Numbers (SSN)
Phone Numbers
Email Addresses
API Keys & Secrets — OpenAI, AWS, GitHub, Stripe, and more
Passwords in Plaintext

✨ KEY FEATURES:

Realtime scanning of every message and paste before submission
Warning overlay that highlights exactly what was detected
* "Remove & Send" — automatically redacts sensitive data and sends the clean message
* Per-category toggles — choose which types of data to detect
* On-page status badge so you always know protection is active
* One-click pause/resume directly from the ChatGPT page

🔒 YOUR PRIVACY MATTERS: PromptShield runs 100% locally in your browser. No data is collected, transmitted, or stored externally. No analytics. No tracking. No external requests.

Works on chat.openai.com and chatgpt.com -- other LLMs/AI tools support coming soon.