Prompt Firewall

Use AI without leaking your life into it.

A Chromium extension that scans every prompt locally in your browser — and warns before sensitive data reaches ChatGPT, Claude, Gemini, Perplexity, or Copilot.

Try the live demo → Privacy policy Chrome Web Store

Live demo

Try the warning flow in a mock chat. Uses the same detector and UI patterns as the marketing-site demo bundle (no install).

/demo.html

Privacy policy

Local-first storage, optional BYO-key sanitise, no telemetry — spelled out for the Chrome Web Store and users.

/privacy.html

Chrome Web Store

Install from the store when your listing is approved. Until then, use Load unpacked from the repository extension folder.

Listing URL — configure in deploy

At a glance

Detection runs in the browser; nothing is sent to us (there is no backend).
Optional Sanitise uses your API key to providers you choose.
Privacy Mode blocks outbound calls when you want zero network from the extension.

Install from source (developers)

1. Open chrome://extensions
2. Enable Developer mode
3. Click Load unpacked and select the extension root from this repository (the folder that contains manifest.json — not this store-web folder).