PasteGuard
Protect your secrets — intercept and sanitize pastes before they reach chatbots or LLMs.
PasteGuard is a privacy-first browser extension that protects you from accidental data leaks when pasting sensitive information into AI chatbots, LLMs, and search engines. It can be configured to detect patterns like API keys, emails, and credentials, replacing them with safe dummies before they ever leave your device.
Ideal for: Developers handling API keys, professionals sharing client data, or anyone who values privacy. pasteGuard works transparently across all websites, with minimal permissions and zero tracking.
Why install PasteGuard?
- 🔒 Data Leak Prevention: Stop exposing secrets to AI tools, forms, and shared platforms.
- ⚙️ Custom Rules & Two-Way Restore: Define literal or regex-based replacements to sanitize private data on paste. It even features a two-way restore mode to bring your real values back when copying from the site.
- 🧠 Smart Field Detection: Automatically detects and allows safe pastes in sensitive inputs like login, OTP, or password fields so it never interrupts your workflow.
- 🛡️ Guarded Sites: Enable protection only where you need it. Use site whitelisting to ensure trusted sites stay completely unaffected.
- 🧩 100% Local & Private: All processing happens directly on your device — nothing ever leaves your browser. Built with Manifest V3, TypeScript, and a custom, zero-telemetry rule engine.
Installation
You can install PasteGuard from the official browser extension stores:
Demo
Watch our 1-minute demo to see how PasteGuard intercepts and protects your data in real-time:
Configuration
Adding Rules
- Click on the pasteGuard extension icon in your browser toolbar.
- Open the Rules tab.
- Add a new rule by specifying the literal string or regular expression you want to protect (e.g., an API key pattern).
- Define the replacement value (the "safe dummy" text) that will be pasted instead.
- Choose whether the rule should trigger on copy, paste, or both.