BreachDirectory
Free lookup to see if an email or username appears in public breaches.
BreachDirectory provides a free service for checking whether specific email addresses or usernames have appeared in publicly disclosed data breaches. This tool helps individuals verify if their personal information has been compromised in past security incidents, allowing them to take appropriate steps to secure their accounts. It serves as an accessible resource for basic breach monitoring without requiring paid subscriptions.
Dual-use tool. This is capable of legitimate research (journalism, security, due diligence) and of harassment or stalking. Listing it here is not an endorsement of either use.
Privacy note. Check whether your email or username appears in known breaches.
Official site: https://breachdirectory.org
Last verified 2026-08-31.