Password Leak Checker
Securely check if your password has appeared in historical database breaches.
Breach Leak & Password Security Studio
Check HaveIBeenPwned database leaks, entropy score, and brute-force crack time (100% Zero-Knowledge K-Anonymity).
Password Input
100% Zero-Knowledge K-Anonymity Guarantee
Your password is never transmitted over the network. It is hashed into a SHA-1 string inside your browser, and only the first 5 prefix characters are queried.
Enter a password on the left to analyze strength entropy and HIBP breach exposures.