PromptGuard
Extension Actions
- Live on Store
Real-time firewall that detects and blocks prompt injection attacks before they reach OpenAI, Anthropic, or any LLM API.
PromptGuard is a browser-layer security extension that protects your AI-powered workflows from prompt injection attacks.
HOW IT WORKS:
1. L1 Pattern Engine (<1ms): Checks against 188+ patterns in 10 languages. Injections blocked instantly.
2. L2 Semantic Analysis (≤400ms): DeBERTa ML model confirms suspicious prompts.
3. L3 GPT Fallback: GPT-4o-mini handles edge cases.
WHAT IT PROTECTS AGAINST:
• Instruction override ("ignore all previous instructions")
• Persona hijacking ("you are now DAN")
• Data exfiltration attempts
• Jailbreak templates (DAN, AIM, STAN)
• Multilingual attacks (Turkish, German, Spanish, Russian, and more)
PERFORMANCE (546 labeled samples):
• Precision: 98.3%
• Recall: 87.2%
• F1 Score: 92.4%
PRIVACY:
• Only flagged prompts are transmitted — normal requests never leave your browser
• No personal data or browsing history collected
• Full source code: github.com/ahmetai-cell/promptguard