What is LLMSecure?
LLMSecure is a free security scanner designed to identify prompt injection attacks and manipulation techniques targeting AI systems. It analyses prompts, URLs, files, and MCP (Model Context Protocol) servers to detect vulnerabilities before they reach your language models. The tool requires no sign-up, making it quick to test suspicious inputs or review your own prompts for security gaps. It's particularly useful for developers, security teams, and anyone deploying AI agents in production environments where injection attacks pose a real risk. By catching these threats early, you can prevent unauthorised prompt manipulation, data leakage, or unexpected AI behaviour.
Key Features
Prompt injection detection
identifies attempts to override model instructions or extract hidden information
AI agent trap detection
flags inputs designed to trigger unintended agent behaviour
Multi-format analysis
scans prompts, URLs, uploaded files, and MCP server configurations
No authentication required
test inputs immediately without creating an account
Free to use
full access to all scanning capabilities at no cost
Pros & Cons
Advantages
- Instant access without sign-up friction
- Covers multiple input formats and server types in one tool
- Addresses a genuine security gap for AI deployments
- Completely free with no hidden costs or usage limits
Limitations
- Limited information available about detection accuracy rates or false positive rates
- No clear documentation on what specific injection techniques are covered
- As a free tool, may have fewer advanced features than commercial alternatives
Use Cases
Testing prompts before deploying them to production AI agents
Scanning user-submitted inputs to catch injection attempts in real time
Auditing MCP server configurations for security vulnerabilities
Reviewing URLs and files that will be processed by language models
Security research and testing your own AI system defences