Password Breach Checker

How do I check if my password was leaked?

Enter your password in the input field and click Check Password. We use the HaveIBeenPwned database which contains over 14 billion compromised passwords from known data breaches.

Is this password checker safe to use?

Yes, completely safe. Your password never leaves your browser. We use k-anonymity: only the first 5 characters of your password hash are sent to the API, making it impossible to reverse-engineer your actual password.

What is k-anonymity and why does it matter?

K-anonymity is a privacy technique. Instead of sending your full password hash, we only send the first 5 characters. The API returns all hashes matching that prefix, and we check locally if your password is in the list. This means even the API cannot know which password you checked.

What should I do if my password was breached?

Change it immediately on all sites where you use it. Use a unique, strong password for each account. Consider using a password manager to generate and store complex passwords securely.

How does the password strength meter work?

We analyze password length, character variety (uppercase, lowercase, numbers, symbols), and common patterns. The strength score estimates how difficult it would be for an attacker to crack your password.

How often is the breach database updated?

HaveIBeenPwned continuously adds new breaches as they are discovered. The database contains passwords from over 700 data breaches and is one of the most comprehensive sources available.

Can I check multiple passwords?

Yes, you can check as many passwords as you want. Each check is independent and your password history is never stored.

Why should I use unique passwords for each account?

If one account is breached and you reuse passwords, attackers can access all your accounts with that password. Using unique passwords limits damage to just the compromised account.