Email Breach Checker
Enter an email address to check it against known public data breaches and see which ones it's appeared in, when, and what kind of data was exposed in each.
Overview
Data breaches happen to services, not to the people whose data they hold — so the first sign an account is exposed is often a breach announcement for a company you don't remember ever hearing about again after signing up years ago. This tool checks an email address against a public breach database and reports every known breach it appears in, along with the date and the categories of data exposed in that particular incident (passwords, physical addresses, and so on).
A result showing no breaches means the address wasn't found in this tool's data source at the time of the check — it isn't a guarantee the address has never been exposed anywhere, only that it isn't in a known, indexed breach right now.
Examples
Checking an address with no known breaches
an address not in any known breach
Not found in any known breach.
How It Works
- Enter the email address you want to check.
- Complete the verification check.
- Click Check to see every known breach the address appears in, with its date and exposed data categories.
Use Cases
Checking your own accounts
Find out which of your old accounts were caught up in a breach so you know exactly where to change a reused password.
Vetting a work email before a policy rollout
Check a company email address as part of a security awareness review before mandating password resets or MFA enrollment.
Tips
- If an address shows up in a breach where passwords were exposed, change that password everywhere it was reused, not just on the breached service.
- A breach date reflects when the breach happened, not when it was discovered or disclosed — some breaches surface publicly years after the actual incident.
FAQ
No. Each check is a live, uncached lookup — the address is sent to the breach data source for that single request and isn't stored by this tool afterward.
A third-party breach database (Have I Been Pwned) that aggregates and verifies publicly known data breaches.
The address wasn't found in this tool's breach data source as of the time you checked — it's a good sign, but not an absolute guarantee the address has never been exposed.
Each check uses a paid, rate-limited breach-data subscription, so a quick bot check helps keep the tool available and prevents automated abuse.