Password Breach Check — Has Your Password Leaked?
Check if your password appears in known data breaches — privately.
What is a password breach check?
When websites get hacked, stolen username-and-password pairs are collected into giant breach databases and traded by criminals. This free tool checks whether a password you use appears in those databases — without ever revealing your password to anyone. It uses the respected HaveIBeenPwned service, which holds billions of breached password hashes contributed from real-world data breaches.
How k-anonymity protects you
Here is the clever part: your password is hashed with SHA-1 inside your browser, and only the first 5 characters of that hash are sent to the database. The service returns every matching hash fragment (hundreds of them), and your browser checks privately whether your full hash is among them. Your password — not even its complete hash — ever leaves this page. It is the same privacy-preserving design recommended by security professionals.
How to use it
Type a password you currently use (toggle Show password if you want to see it), then press Check for breaches. You will get a clear verdict: SAFE means it was not found in known breaches; BREACHED tells you how many times it has been seen, with steps to fix it.
If your password is breached
Change it everywhere you used it — starting with your email, since email resets unlock everything else. Move to a password manager with a unique random password per site, and enable two-factor authentication on important accounts. And remember: a password can be "safe" today and breached tomorrow, so check again once in a while.