Protect Your AI Assistant from Hidden Text Attacks - Now in Your Browser
SafePrompt Chrome Extension Now Available: Real-Time AI Prompt Injection Protection
Also known as: SafePrompt browser extension, Chrome AI security, prompt injection detector•Affecting: Chrome, ChatGPT, Claude, Gemini, Perplexity
The SafePrompt Chrome Extension is now live on the Chrome Web Store. Detect hidden text attacks and prompt injection in real-time while browsing. Free to install and use.
TLDR
The SafePrompt Chrome Extension is now available on the Chrome Web Store. It detects hidden text injection attacks in real-time, protecting AI assistants like ChatGPT, Claude, and Gemini from being manipulated by invisible malicious instructions embedded in web pages. Free to install with no account required.
Quick Facts
Now Live on Chrome Web Store
Protect yourself from hidden text injection attacks while browsing. Works with ChatGPT, Claude, Gemini, Perplexity, and any AI assistant.
Add to Chrome - FreeWhat is Hidden Text Injection?
Hidden text injection is a growing attack technique where malicious instructions are embedded invisibly in web pages. When you ask an AI assistant to analyze or summarize a page, these hidden instructions can hijack the AI's response.
The Threat is Real
Invisible to humans: Attackers use CSS tricks like white text on white backgrounds, zero-width characters, and off-screen positioning
Visible to AI: AI assistants read the full page content, including hidden text
Real attacks: Perplexity's Comet browser and other AI tools have been exploited using these techniques
How SafePrompt Chrome Extension Protects You
The SafePrompt Chrome Extension scans web pages in real-time to detect and highlight hidden text injection attacks before they can manipulate your AI assistant.
Real-Time Detection
Automatically scans pages for 15+ hidden text techniques including invisible CSS, zero-width characters, and off-screen positioning.
Visual Alerts
Highlights detected injections with red borders so you can see exactly where attacks are hidden on the page.
Works Everywhere
Protects you on any website when using ChatGPT, Claude, Gemini, Perplexity, or any AI assistant.
Privacy First
All detection happens locally in your browser. No data is sent to external servers.
15+ Hidden Text Techniques Detected
The extension detects a comprehensive range of hidden text injection techniques:
Try the Live Demo
Want to see the extension in action? Visit our interactive demo page that contains all 16 hidden text injection techniques. With the extension installed, you'll see each attack highlighted in real-time.
Interactive Demo Page
See 16 different hidden text injection techniques and how the extension detects them.
View Demo PageGetting Started
Installing and using the SafePrompt Chrome Extension takes less than a minute:
Install from Chrome Web Store
Click "Add to Chrome" on the Chrome Web Store page. No account required.
Browse Normally
The extension works automatically in the background on every page you visit.
Get Alerts
When hidden text is detected, you'll see visual highlights and can click the extension icon for details.
Who Should Use This Extension?
AI Power Users
If you regularly ask AI assistants to summarize, analyze, or interact with web content, this extension protects you from hidden manipulation.
Security Researchers
Quickly identify hidden text injection techniques on any website. Great for auditing pages and understanding attack vectors.
Developers
Test your own websites for accidental hidden text that could be exploited. Ensure your AI-facing pages are secure.
Everyone Using AI
As AI assistants become part of daily browsing, protecting yourself from hidden attacks is essential for everyone.
Free and Open
The SafePrompt Chrome Extension is completely free to use. There's no account required, no premium tier, and no data collection. We built this to make the web safer for AI-assisted browsing.
Get Protected Today
Install the SafePrompt Chrome Extension and browse safely with AI assistants. Free, fast, and privacy-focused.
Install Chrome ExtensionReferences & Further Reading
- SafePrompt Chrome Extension on Chrome Web StoreChrome Web Store • February 2026
- Page Injection Demo - Test Hidden Text DetectionSafePrompt • February 2026
- Comet Browser Prompt Injection Attack AnalysisSafePrompt Blog • January 2026