LeakCheck
Data-breach search engine for exposed emails, usernames and passwords.
LeakCheck's page lists 10B+ entries in its database from 1,366+ breach sources, searchable by email or username in the browser or through an API. It offers breach monitoring that alerts you when a monitored email address or username turns up in a newly added leak, and BulkCheck for uploading files. Its FAQ says passwords are hidden in results on free accounts, and its page says anyone can make their records unsearchable through its data removal process.
Dual-use tool. This tool can be used for research and investigation, and also to find, track or identify people without their consent. 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 2026-10-12.
Description rewritten from the vendor's own pages and checked against them. How entries are checked.