Revealer / Search tools
Data Breach Lookup & Breach Check
Run a free breach check to see whether your email, username, or password has surfaced in a known data breach. Results come from known breach datasets and return in seconds.
Free to start · 700+ platforms · Results as sources respond
What a data breach lookup checks
A data breach lookup compares the email, username, or password you enter against records exposed in past data breaches. It shows which leaks an identifier turned up in and what was exposed alongside it, such as passwords, usernames, phone numbers, or other account details. The point of a breach check is to surface where your own information is already public so you can lock down accounts before that exposure is used against you.
How a breach check works
A breach check runs your identifier through a searchable index of known leaks rather than scanning the live web. When you enter an email or username, the data breach search matches it against those datasets and returns the breaches it appears in. A good data breach checker also tells you what type of data was exposed in each one, so a match on an old forum leak reads very differently from a match that exposed a password you still reuse.
What to do if you have been breached
If your email turns up in a data breach, change the password on that account and on any other account where you reused it. Turn on two-factor authentication wherever it is offered. A password manager makes it easier to keep a unique password for every login, so a single leaked credential does not put the rest of your accounts at risk.
Check before attackers do
Breached credentials are traded and reused long after the original leak goes public. Running a breach check on your own email and usernames lets you find exposed accounts before someone else does. Repeating the lookup periodically helps you catch new breaches as they are indexed and added.
Types of data exposed in breaches
Breaches expose different fields depending on what the company stored. Common ones include email addresses, passwords, phone numbers, and physical addresses. Leaked passwords matter most because they are so often reused, so one exposed password can unlock several of your other accounts. A data breach checker tells you which of these fields showed up alongside your identifier so you know exactly what to rotate.
Data breach vs info stealer logs
Two kinds of exposure show up in a lookup. A normal data breach is a single company leaking its stored records, so the exposure is tied to one service. Info stealer logs are different: they come from malware running on your own device and capture whatever was on it, including saved passwords and active session cookies. Because stealer logs include session cookies, they can let someone into an account even without the password.
How often should you run a breach check?
New breaches surface continually, so a single lookup only reflects what was known that day. Asking "have I been breached" once is not enough. A recurring email breach check beats a one-time search because it catches leaks that appear after you last looked, which is why ongoing breach monitoring is worth setting up once you have run your first check.
Using Revealer
Frequently asked questions
How do I check if my email was in a data breach?
Enter your email address in the search box above. The data breach lookup checks it against known breach datasets and shows you which leaks it appeared in and what was exposed in each one.
Can I check if my password was leaked?
Yes. A breach check reports when a password was exposed alongside your email or username in a known leak. If a password shows up, treat it as compromised: change it on that account and anywhere you reused it, then turn on two-factor authentication.
What does "have I been breached" actually mean?
It means checking whether your credentials appear in a known data breach. A data breach search matches your email or username against leaked databases; if it turns up, your information was exposed in that breach and any reused passwords should be changed.
Is the data breach lookup free?
You can start for free. Free accounts get a limited number of breach checks; paid plans add unlimited lookups, ongoing breach monitoring, and exposure alerts.
What data sources do you check?
We run each breach check against known data breach datasets covering exposed emails, passwords, usernames, and phone numbers.
What should I do if my password was exposed?
Change the password immediately on the affected account and anywhere else you reused it, then enable two-factor authentication. Use a unique password for each account going forward so the next leak stays contained.
Related reading
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