VeilPrompt

Swap the real names out before the chat sees them.

VeilPrompt is a browser extension for ChatGPT. It replaces personal data in your messages with realistic stand-ins before they leave your browser. When the reply comes back, it shows your real values again on your screen.

YOUR PII STAYS WITH YOU. Detection runs on your device. VeilPrompt has no server and does not upload your messages, stand-in tables, or conversation logs.

Best for

One-off tasks in ChatGPT that involve personal data: summarizing an email thread, a support ticket, or meeting notes.
Rewriting or proofreading a cover letter, CV, or message that contains your contact details.
Asking questions about a contract, invoice, or log file that contains bank details, card numbers, or API keys.

How it works

Detect. Emails, phone numbers, card numbers, bank accounts, national IDs, API keys, and IP addresses are found by pattern checks. Names, addresses, and cities are found by a small local model.
Stand in. Each value is replaced with one of the same kind, such as a card number that passes the Luhn check.
Restore. The reply is shown with your real values again, while VeilPrompt is installed and on for that chat.

Limits

Detection is not perfect. Check the highlighted items before you send. Turn off any item you do not want hidden, or add values to the allow list.
Names and addresses need the local model, which downloads once (about 58 MB, from Hugging Face) when you press Download model.
Works only on ChatGPT (chatgpt.com and chat.openai.com) in Chrome on desktop. Claude and Gemini are not supported yet.
Built for single tasks. Not reliable for long conversations or for reopening older chats: the stand-in table and conversation log are kept only for the browser session.
Files, images, and voice input are not masked.
VeilPrompt does not control how ChatGPT or OpenAI handles what it receives. Anything it did not detect is sent unchanged.

Privacy

Your data stays in your browser. Read the full privacy policy.

Get VeilPrompt

Chrome Web Store listing: coming soon.

Feedback

Questions, bug reports, or ideas: open an issue.