Password Breach Checker
Check if your passwords have been exposed in known data breaches. Uses Have I Been Pwned's k-Anonymity model to securely verify password safety without sending your actual password.
Your Privacy is Protected
We use k-anonymity to check your password without ever sending it to any server. Only the first 5 characters of the hash are sent.
Your password is hashed locally and never sent to any server
How It Works
- Your password is hashed using SHA-1
- Only the first 5 characters of the hash are sent
- We receive all matching hash suffixes
- Your password is checked locally against the matches
Powered by Have I Been Pwned
Why Check for Breached Passwords?
Data breaches expose millions of passwords every year. Attackers use these leaked passwords in credential stuffing attacks. If your password has been breached, you should change it immediately on all accounts where you use it.
Frequently Asked Questions
Is it safe to enter my password here?
Yes! Your password never leaves your browser. We only send a partial hash (first 5 characters) to check against the database, making it impossible to reverse-engineer your actual password.
What is k-Anonymity?
k-Anonymity is a privacy technique where your search query is anonymized by requesting a range of results, hiding your specific query within a larger set of possibilities.
What should I do if my password was breached?
Change the password immediately on all accounts where you use it. Use a unique, strong password for each account, and consider using a password manager.
How often is the breach database updated?
The Have I Been Pwned database is continuously updated as new breaches are discovered and verified. It contains billions of compromised passwords.