Password Breach Checker
Check if a password has appeared in known data breaches, using the free Pwned Passwords database. Your password never leaves your browser in full.
Check Settings
What to Check
Your full password is never sent anywhere — only a partial hash is checked (k-anonymity)
How this works
Password checks use the k-anonymity model: only the first 5 characters of your password's SHA-1 hash are sent to the Pwned Passwords API — never the password itself. Email breach checking is not implemented here (see results panel for where to check for real).
Check for Data Breaches
Enter your email or password to check if they have been exposed in known data breaches.
Data Breach Statistics
15B+
Passwords Exposed
500M+
Email Addresses
10K+
Data Breaches
65%
Reuse Passwords
Did you know? 80% of data breaches involve weak, stolen, or reused passwords. Regular breach checking can help prevent unauthorized access to your accounts.
🔒 How to Protect Yourself from Data Breaches
Preventive Measures
- Use unique, strong passwords for every account
- Enable two-factor authentication (2FA) everywhere possible
- Regularly check if your credentials have been exposed
- Use a password manager to generate and store passwords
If You're Affected
- Immediately change affected passwords
- Monitor your accounts for suspicious activity
- Consider freezing your credit if sensitive data was exposed
- Report the breach to relevant authorities if necessary