Data Breach Checker
Millions of people have had their personal information stolen in data breaches — and many do not even know it. Use this tool to browse major breaches, check if companies you use were affected, and follow our step-by-step checklist to protect yourself.
Check Your Email
Enter your email address below to learn about data breaches and what steps to take. This tool is educational only — for a real breach check, we recommend the trusted, free service linked below.
Major Data Breaches
Browse 25 of the largest known data breaches. Search by company name, filter by the type of data exposed, and click any breach card to learn more and see what steps to take.
Showing 25 of 25 breaches
What To Do After a Data Breach
Use this interactive checklist to make sure you have taken the most important steps to protect yourself. Check off each item as you complete it.
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Frequently Asked Questions
What is a data breach?▾
A data breach happens when hackers break into a company's computer systems and steal personal information — like email addresses, passwords, Social Security numbers, or credit card numbers. The stolen data is often sold or posted online for criminals to use.
How do I know if my data was breached?▾
The best way to check is to visit HaveIBeenPwned.com, a free and trusted website that checks if your email address appears in any known data breaches. Companies are also required to notify you if your data was exposed, usually by mail or email.
What should I do if my data was in a breach?▾
Change the password for the affected account immediately. Then change the password anywhere else you used the same one. Turn on two-factor authentication, check your credit reports, and consider placing a fraud alert or credit freeze. Our checklist tool above walks you through every step.
What is a credit freeze and should I do one?▾
A credit freeze prevents anyone — including you — from opening new credit accounts in your name until you lift the freeze. It is free and highly recommended if your Social Security number was exposed. You need to freeze at all three bureaus: Equifax, Experian, and TransUnion.
Is HaveIBeenPwned.com safe to use?▾
Yes. HaveIBeenPwned was created by Troy Hunt, a well-known cybersecurity expert. The site is recommended by governments, banks, and security professionals worldwide. It does not store your email or share it with anyone — it simply checks if your address appears in known breach data.
Can I prevent data breaches?▾
You cannot prevent a company from being hacked, but you can limit the damage. Use a different strong password for every account, enable two-factor authentication everywhere possible, give companies only the minimum information they need, and regularly check your accounts for suspicious activity.