Check any password against billions of records from known data breaches — instantly, and without ever sending your actual password anywhere.
Your password is hashed in your browser (SHA-1) before anything is sent. Only the first 5 characters of the hash ever leave your device — this is the same k-anonymity method used by Have I Been Pwned. We never see, log, or store your actual password.
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Checking passwords one at a time only gets you so far. We help businesses roll out MFA, password policies and credential monitoring across their whole team.
Talk to us on WhatsAppYour password is converted into a SHA-1 hash locally, using your browser's built-in crypto engine. The plain-text password never leaves your device.
Just the first 5 characters of that hash are sent to check for matches — a technique called k-anonymity. It's mathematically impossible to reconstruct your password from that fragment.
We check that fragment against the Have I Been Pwned database of billions of passwords exposed in real, documented data breaches — and tell you instantly if there's a match.