🔐
Developer/Password Strength Tester

Password Strength Tester

Analyze password entropy, crack time, and check against known data breaches. Your password never leaves the browser.

100% LOCALEntropy calcCrack time est.9 quality checksHIBP guidance
ANALYSIS
Enter a password to analyze its strength, entropy, crack time, and check it against known data breaches.

All analysis runs locally. The breach check uses k-anonymity for privacy.
Data Source & Legal Disclaimer
Effective: Current
Sources: NIST SP 800-63B — Digital Identity Guidelines · Have I Been Pwned — k-anonymity API

All password analysis is performed locally in your browser. The breach check uses k-anonymity: only the first 5 characters of your password's SHA-1 hash are sent to Have I Been Pwned. The full hash never leaves your device.

Joke of the Day
Jul 28

What do you call a shoe made from a banana peel?

100% Free, Forever

Keep Tools Free for Everyone

No paywalls, no signups, no data sold. Built by a solo developer who believes useful tools should be accessible to everyone.

Support me on Ko-fi— keep tools free

100% of proceeds go towards hosting & building more free tools.