How to Check If Your Password Has Been Leaked

Passwords appear in breach data all the time. The useful question is not whether leaks happen. It is whether you know when one of your own passwords has already shown up in a leaked dataset.

Our breach test helps you react before attackers can reuse that password somewhere else.

What a Breach Check Tells You

A password breach checker compares your password, safely, against known leak datasets. If the password appears there, you should treat it as compromised even if the original breach happened years ago.

A result that says "not found" is useful, but it does not mean the password is automatically strong. It only means it is not currently present in the known breach corpus.

How Privacy-Preserving Checks Work

Good breach checkers do not send your full password to a remote service. Instead, they use a method such as k-anonymity, where only a small hash prefix is sent and the final comparison happens locally.

That lets you benefit from the leak database without exposing the full secret you are testing.

What to Do If the Password Is Found

• Change the password immediately on the affected account.
• Change it anywhere else you reused it.
• Enable MFA if it is not already enabled.
• Review recent account activity for suspicious access.
• Replace the old password with a new secret: use our password generator for a long random string, or our passphrase generator if you need something easier to remember.

What to Do If the Password Is Not Found

• Keep using unique passwords per account.
• Check the password's strength separately.
• Avoid assuming a "not found" result means the password is ideal.
• Repeat the check periodically for important accounts.

Good Habits Going Forward

Use a password manager so you do not need to reuse passwords. Let it generate random passwords for stored logins and long passphrases for memorized secrets when needed.

Make our breach test part of your normal maintenance habit for email, banking, and other high-value accounts.