Free prompt injection vulnerability checker — test chatbot system prompts against 31 known attack patterns.
LochBot is a free prompt injection vulnerability checker that analyzes your chatbot's system prompt against 31 real-world attack patterns across 7 categories. Get a 0-100 security score, letter grade, and specific fix suggestions for every vulnerability detected. All analysis runs 100% client-side — your system prompt never leaves your browser.
- Tests against 31 prompt injection attack patterns including role play jailbreaks, delimiter attacks, and data extraction
- 7 vulnerability categories covering direct injection, context manipulation, encoding attacks, and prompt leaking
- 0-100 security score with letter grade (A through F)
- Severity ratings (critical, high, medium, low) for every detected issue
- Specific, actionable fix suggestions tailored to each vulnerability
- JSON export for compliance reporting and audit documentation
- Catalog of known jailbreak techniques from academic LLM security research
- OWASP LLM Top 10 aligned threat modeling
- 100% client-side — no data leaves your browser
- MIT licensed
- No signup, no tracking
- Minimum Viable Secure Prompt — The shortest system prompt that passes all LochBot checks
- Prompt Defense Techniques — Which prompt defense techniques actually work
- Prompt Security Patterns — System prompt patterns ranked by security score
- Pure HTML, CSS, and vanilla JavaScript
- No build step
- No external dependencies (except Google Fonts on some pages)
- Hosted on GitHub Pages with Cloudflare CDN
LochBot is part of Zovo Tools — free developer tools by a solo developer. No tracking, no signup, no nonsense.
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MIT licensed.
Built and maintained by Michael Lip. For questions or feedback: support@zovo.one