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📧 Email Breach Checker

Check whether your email appeared in a known data breach — cross-referenced against 847M+ leaked credentials via HaveIBeenPwned.

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Your email is sent to the HaveIBeenPwned API over TLS. HIBP does not log or store queries. We never store or share your email address.

Checked against 847M+ leaked credentials via HaveIBeenPwned.

📚 What is a data breach and what can attackers do with it?

A data breach happens when an attacker gains unauthorised access to a company's user database and steals credentials. The stolen data — often including emails, usernames, and password hashes — is then sold on dark-web markets or leaked publicly.

Attackers use these lists in credential stuffing attacks: automatically trying each email/password combination against other sites like banks, email providers, and social media. If you reuse passwords, one breach unlocks many accounts.

The fix: a unique, randomly generated password for every site. A password manager makes this effortless.

How to use this tool

  1. 1 Enter an email address in the search field.
  2. 2 Click Check.
  3. 3 The tool queries breach databases to see if the address appeared in any known data leaks.
  4. 4 If breaches are found, change the passwords for any accounts using that email address.

Frequently asked questions

What is a data breach?
A data breach is an incident where attackers access a database and steal user records. Stolen data often includes email addresses, passwords, and personal details.
What should I do if my email was in a breach?
Change your password on that site immediately and on any other site where you used the same password. Enable two-factor authentication wherever possible.
Are breached passwords stored in plain text?
Most sites hash passwords before storing them, but attackers can crack weak hashes. Always use a unique, complex password for each account.
How often is the breach database updated?
Breach data is added as new incidents are disclosed publicly or discovered by security researchers. Some breaches are not discovered for months or years after they occur.

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