Check whether your password has appeared in a known data breach with this free password breach checker. It uses a privacy-preserving method called k-anonymity — only a short hash prefix ever leaves your device, so your actual password stays private.
How it works
- Your password is hashed (SHA-1) inside your browser.
- Only the first 5 characters of that hash are checked against a database of billions of breached passwords.
- The tool matches the result locally and tells you if your password has leaked — and how many times.
Frequently asked questions
Is it safe to type my password here?
Your full password never leaves your device — only a 5-character hash prefix is checked (k-anonymity). Still, avoid pasting a password you actively rely on if you're unsure.
My password was found — what should I do?
Stop using it everywhere immediately. Create a unique, strong password for each account and enable two-factor authentication.
My password wasn't found — am I safe?
It means it hasn't appeared in known breaches yet. Always still use a unique password per account.
