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Password Strength Checker
Analyze the strength of a given password, showing real-time feedback on length, entropy, and weaknesses.
Password Strength
Score: 0/100 |
Entropy: 0 bits |
Estimated crack time: Unknown
Security Checks
Recommendations
Password Strength Evaluation
Password strength depends on length, character diversity, and unpredictability. NIST SP 800-63B recommends minimum 8 characters for user-chosen passwords and 6 for randomly generated ones. Entropy (measured in bits) quantifies randomness — each character from a 94-character set adds ~6.5 bits. A truly random 16-character alphanumeric password has ~95 bits of entropy. Dictionary words, common substitutions (p@ssw0rd), and keyboard patterns (qwerty) dramatically reduce effective strength.
CLI Equivalent
pwgen -s 16 1
openssl rand -base64 16
openssl rand -base64 16