Find out whether your password has appeared in a data breach before and improve your security.
Password reuse is extremely common and puts your accounts at risk. When credentials are exposed in data breaches, attackers can use those known email and password combinations to access your other accounts.
NIST guidelines specifically recommend checking user passwords against previously compromised datasets. This service provides a simple and secure way to follow that guidance.
Attackers exploit password reuse habits by automating login attempts with credentials leaked from other sites.
Large-scale breaches often expose millions of passwords that are reused across multiple services.
Even when users alter passwords between sites, attackers can easily guess common patterns.
Your password is hashed with SHA-1 in your browser; only the first 5 characters of the hash are sent to the server, and your browser matches the returned candidates. Neither the full password nor the full hash is sent to the server.
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