Prompt Injection Checker
Free AI security scanner for LLMs.
Scan system prompts, agent prompts, and user inputs for injection attacks, secret leakage, and jailbreak risks. Pure browser-side analysis with no API calls.
Tool Section
Scan prompts for risks
Paste system prompts, agent prompts, and user inputs to detect injection attacks, secret leakage, and jailbreak patterns.
Scan Results
Security Analysis
Heuristic risk scores based on detected patterns across all prompt fields.
Risk Score
0
out of 100
Injection Risk
—
Secret Leakage Risk
—
Issues Found
0
detected patterns
Detect instruction override, jailbreak, and role-play attacks in seconds.
Identify secret leakage risks and API key exposure in prompts.
Keep analysis private with no database, login, API key, or backend.
What this scanner detects
The Prompt Injection Checker uses static heuristics to flag common attack patterns. It is a first line of defense, not a replacement for red-teaming or production guardrails.
Instruction Override
Patterns like 'ignore previous instructions' that attempt to replace system directives.
System Prompt Leakage
Requests to reveal or show the system prompt, hidden instructions, or internal rules.
Secret Extraction
Attempts to output secrets, API keys, passwords, or credentials embedded in prompts.
Jailbreak Patterns
Known jailbreak keywords such as DAN, 'do anything now', and related variants.
Restriction Bypass
Phrases that attempt to disable safety controls, remove restrictions, or bypass limits.
Role-Play Attacks
Combinations of role-play with instruction override to manipulate model behavior.
FAQ
What is a prompt injection checker?
A prompt injection checker scans prompts and user inputs for patterns that attempt to override system instructions, reveal secrets, or bypass safety controls.
Does this tool use an AI API?
No. All detection runs locally in your browser using static rule matching. No API key, login, or data upload is required.
What risks does it detect?
It detects instruction override attempts, secret leakage prompts, jailbreak patterns, restriction bypasses, and role-play attacks.
Is the risk score accurate?
The score is a heuristic based on detected patterns. It helps prioritize review but does not guarantee security. Always layer with additional defenses.
Can it prevent prompt injection?
No. Detection is not prevention. Use the suggested fixes alongside input validation, output filtering, and least-privilege tool access.
What are suggested fixes?
Suggested fixes include adding input boundaries, removing secrets from prompts, using allowlists, and applying defense-in-depth strategies.