LeakCheck
Data-breach search engine for exposed emails, usernames and passwords.
LeakCheck is a data breach search engine that allows users to check if specific email addresses, usernames, or passwords have been compromised in known security incidents. It serves as a legitimate resource for individuals and organizations to verify their exposure status and assess potential risks associated with leaked credentials.
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 credentials appear in known breaches.
Official site: https://leakcheck.io
Last verified 2026-08-31.