Password Entropy & Brute-Force Strength Calculator
Calculates password entropy bits and estimated brute-force crack time based on character set pool size.
Notice: engineering verification utility. Use test or de-identified data and verify results independently before relying on them.
How it works
Standard: NIST SP 800-63B Digital Identity Guidelines
Formula: Entropy = Length * Log2(Pool_Size)
Checks: Positive password length and character variety
Calculated locally in browser memory; nothing leaves your browser.
Deterministic local-first client-side execution. Provided as-is without warranty.