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Check if a password has leaked in a data breach — hashed locally, never sent in full.
Check whether a password has appeared in known data breaches, using the Have I Been Pwned Pwned Passwords database. Your password never leaves your browser — it is hashed with SHA-1 locally and only the first 5 characters of the hash are sent to the API (k-anonymity), so the full password and full hash are never transmitted.
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Your password is hashed with SHA-1 in your browser. Only the first 5 characters of the hash are sent to the Have I Been Pwned API (k-anonymity) — the full password and full hash never leave your device.