How to Check if Your Password Has Been Leaked

Data breaches have let out billions of passwords. You could be one of them, but you'll have to check to find out. You can use a password breach checker to see if your password has been used in any known breaches. It does this in a safe way and never sees your full password.

I check my passwords every few months. It's a quick security habit that only takes 30 seconds but can save you a lot of trouble. If it can't see my password, how does it work? This is the smart part.

The tool works with something called k-anonymity. It compares the first few letters of your password's hash (a one-way mathematical fingerprint) to a list of leaked password hashes. Your real password stays on your device. It's like asking a library if they have any books that start with the letters "HAR." They give you a list, and you look to see if "Harry Potter" is on it.

The library never knows for sure what book you wanted. What to Do If Someone Gave You Your Password Don't panic, but do something right away: Change it right away on every site where you used that password. Each site should have its own password. A password manager can help you with this.

If you have two-factor authentication turned on, no one can get in even if they have your password. Check your accounts for logins you don't recognize to see if anything strange is going on. Why Do Passwords Get Out It's usually not your fault. Hackers get into businesses and steal all of their customers' information.

A lot of passwords were stolen from big companies like LinkedIn, Adobe, Yahoo, and Dropbox. People who steal data share it on private forums, and it eventually makes its way to public breach databases. If you've been online for more than a few years, there's a good chance that at least one of your passwords is out there. Stopping Things from Happening in the Future Using a password manager to store unique, random passwords for each account is the best way to keep yourself safe.

If someone hacks into one site, they only get that password. Everything else stays the same. Our password security check tool can look up the same breach database as haveibeenpwned.com. There are more than 12 billion passwords in this database that have been leaked.

You stay ahead of the game by checking things often.