Have I Been Pwned
Checks emails/accounts against known breaches.
Have I Been Pwned is a free service that allows users to check whether their email addresses or accounts have been exposed in known data breaches. It is commonly used by individuals and security researchers to assess personal exposure to credential leaks. The tool helps identify compromised accounts so users can take steps to secure their digital presence.
Privacy note. The defensive counterpart to breach-hunting tools — lets you check your own exposure rather than someone else's.
Official site: https://haveibeenpwned.com
Last verified 2026-08-30.