PKI Tools
Certificate and key utilities powered by WebCrypto. Certificates and keys never leave your browser.
- Certificate decoder and linter (CA/Browser Forum rules, RFC 5280)
- Chain builder and signature verifier, hostname check
- CSR decoder, CSR and key generator with the equivalent openssl command
- Key matcher, PEM/DER/PKCS#7/JWK converter, CRL checker, OCSP helper
- Key ceremony planner (M-of-N) and RFC 3647 CP/CPS outline builder
More free security tools
- Threat Modeling: Model components, data flows and trust boundaries, generate STRIDE threats with mitigations, rate risk and export a Markdown report with a Mermaid diagram.
- Dev Toolbox: Decode and lint JWTs, evaluate Content-Security-Policy, grade HTTP security headers and cookies, encode/hash data and scan code for leaked secrets, all locally.
- Review Checklists: Run secure code reviews with OWASP Top 10:2025, API Security Top 10 and ASVS 5.0 checklists, record pass/fail with notes and paste the summary into your PR.
- Dependencies & CI: Check package-lock, yarn.lock, requirements.txt, pom.xml, go.sum and more against OSV.dev, and generate GitHub Actions for CodeQL, Dependabot, gitleaks and Trivy.
- Data Lab: Chain 100+ operations into recipes: Base64, hex, URL, AES-GCM, HMAC, PBKDF2, MD5/SHA, gzip, XOR brute force, IOC extraction and defanging, with Magic auto-detect.
- AI Skill Scanner: Scan SKILL.md files, agent instructions, MCP server configs and Claude Code hooks for prompt injection, data exfiltration, hidden Unicode and dangerous commands.
- Website Recon: Passive recon for a domain: DNS records, SPF, DMARC, DKIM, CAA, DNSSEC, certificate transparency subdomains, RDAP registration, HSTS preload and archive history.
Source code on GitHub (open source).