Free Tools

Free Security Tools

Interactive security tools that run in your browser. No signup required, no data sent to servers (except the three live scanners). Built for penetration testers, security engineers, and developers.

Calculators & Analyzers

CVSS 3.1 Calculator

Free online CVSS 3.

Password Strength Analyzer

Free password strength analyzer with entropy calculation, pattern detection, and crack time estimation.

Subnet / CIDR Calculator

Free subnet calculator with CIDR notation support.

Encoders & Decoders

Encoder / Decoder

Free online encoder and decoder for Base64, URL, HTML entities, and Hex.

JWT Decoder

Free online JWT decoder that decodes header and payload, validates expiry, and highlights security issues like alg:none.

Hash Generator

Free online hash generator for SHA-256, SHA-512, and SHA-1.

Regex Tester

Free online regex tester with real-time match highlighting and security-focused presets for IPs, CVEs, emails, AWS keys, and more.

Security Scanners

Security Headers Checker

Free security headers checker that grades your HTTP response headers from A to F.

SSL / TLS Checker

Free SSL/TLS certificate checker.

DNS Security Analyzer

Free DNS security analyzer that checks SPF, DKIM, and DMARC records for any domain.

Need these tools built into your workflow?

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