Never Sent · Local Only · No Tracking
PasswordStrength Checker
Real entropy analysis — not just character rules. Detects keyboard walks, common passwords, l33t speak, date patterns, and gives you actionable feedback. Zero data ever leaves your device.
Your password never leaves your browser. All analysis runs locally in JavaScript. No network requests are made. We recommend using a similar but fake password to test patterns, rather than your real password.
Suggested Passphrase
4 random words · Easy to remember · ~25 bits entropy
Strong Password
16 chars · Cryptographically random · ~105 bits
Entropy Guide
< 28 bitsInstant crack
28–35 bitsMinutes to hours
36–59 bitsDays to months
60–79 bitsYears
80+ bitsCenturies