🛡️ Password Breach Checker

Check if your password has been in a data breach — Free, No Sign-up, Works in Browser

Free Password Breach Checker Online — Check if your password has been in a data breach

Password Breach Checker

Check if your password has appeared in known data breaches. Your password is hashed locally and never sent in full.

How the Password Breach Checker Works

Your password is SHA-1 hashed locally. Only the first 5 characters of the hash are sent to the API (k-anonymity), so your full password is never exposed.

Is this safe to use?

Yes. The k-anonymity model ensures your password never leaves your device in any identifiable form.

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