Free Security Tools Online
14 free security tools built with real algorithms and free APIs -- not toy demos. Password strength, AES-256 encryption, real TOTP codes, breach checking, and more.
14 Tools
100% Free
No Signup
Browser-Side Processing
All 14 Tools
Password Strength Analyzer
FREE
Secure Password Generator
FREE
AES Encryption Tool
FREE
JWT Analyzer
FREE
TOTP Generator
FREE
Password Breach Checker
FREE
SSL Certificate Checker
FREE
HTTP Security Headers Checker
FREE
CORS Security Checker
FREE
IP Subnet Calculator
FREE
Email Address Validator
FREE
Disposable Email Detector
FREE
XSS-Safe Output Encoder
FREE
SQL Injection Pattern Scanner
FREE
Free Security Tools Built With Real Algorithms, Not Toy Demos
Every tool here uses a genuine standard or a free, legitimate API -- AES-256-GCM via the Web Crypto API, real RFC 6238 TOTP codes, the actual Pwned Passwords k-anonymity API, and live DNS/certificate transparency lookups. Two tools that cannot honestly be built this way -- a real port scanner (blocked by browser security) and a live SQL injection attack tester (which would be a weapon, not a tool) -- are intentionally not included.