Security

Password Leak Checker

Check if your password has been leaked in a data breach

🔒 Your password is never sent over the network. Only the first 5 characters of its SHA-1 hash are used (k-anonymity model). Powered by Have I Been Pwned.

About Password Leak Checker

The Password Leak Checker tells you if your password has appeared in known data breaches without sending your actual password anywhere. It uses a secure k-anonymity protocol to check only a partial hash. It is free and entirely safe to use, protecting your privacy while keeping you informed.

Frequently Asked Questions

How do I check if my password has been leaked?

Enter your password and the tool will hash it locally, then send only the first five characters of the hash to the Have I Been Pwned API. It compares the results locally to determine if your password has appeared in any known data breaches.

Is my password sent to a server?

No, your actual password never leaves your device. The tool uses a k-anonymity model where only a small prefix of the hashed password is sent to check against the breach database. Your full password remains completely private and secure.

What should I do if my password has been leaked?

If your password appears in a breach, you should change it immediately on all accounts where you use it. Choose a strong, unique password for each account and consider using a password manager. Enabling two-factor authentication adds an extra layer of security.