🛡️ Password Breach Checker
Check if a password has appeared in a known data breach. Your password is hashed in your browser — only the first 5 characters of the hash are ever sent, so the password itself never leaves your device.
Powered by the Have I Been Pwned Pwned Passwords API using k-anonymity. Your password is never transmitted or stored.
About the Password Breach Check
The password breach checker tells you whether a password has appeared in known data leaks. Breached passwords are collected into huge lists that attackers use for credential-stuffing, so any password that has leaked, even once, is unsafe to keep using anywhere.
This check uses a privacy-preserving method (k-anonymity) so your full password is never sent or exposed. Only a partial, hashed fragment is used to look for matches, meaning you can check safely without revealing the password itself.
Test any password to see if it has been compromised. If it has, stop using it everywhere and switch to a unique, strong replacement.
Frequently asked questions
Has my password been leaked?
Enter it above to check against known breach databases using a privacy-preserving hash. If it appears, it has been exposed in a leak and should never be used again.
Is it safe to type my password here?
Yes. Your full password is never transmitted. The check uses k-anonymity: only a short, hashed prefix is sent, so the password itself stays private.
What makes a password safe?
A safe password is long, unique to each account, and has never appeared in a breach. A password manager makes it easy to generate and store strong, unique passwords.