🔒
Security
HSTS Preload Checker
Parses a pasted HSTS header and validates hstspreload.org requirements (max-age >= 31536000, includeSubDomains, preload).
Requisitos do hstspreload.org: max-age ≥ 31536000 (1 ano), includeSubDomains, preload.
Related Tools
🔐
Password Generator
Generate strong, random passwords with custom length, uppercase letters, numbers and symbols. Generated in the browser — no data leaves your device.
🔐
Encrypt Text
Apply classic ciphers (Caesar, ROT13, Atbash) or Base64. Useful for puzzles, CTFs and testing — do not use for real security.
🛡️
Password Strength Checker
Check the strength of a password with entropy calculation, common-password check and improvement tips. Runs in your browser — no data is sent.