Breach Checker

Breach Engine Active

Check if a password or email has appeared in commercial or open data breaches.

k-Anonymity Protection: Your password is hashed with SHA-1 in your browser. Only the first 5 characters leave your device; the full password never hits any server.

Results update automatically as you type

Password — SHA-1 k-Anonymity ModelVerified
  1. Your password is hashed with SHA-1 locally in your browser.
  2. Only the first 5 characters (prefix) are sent to /api/passwords/{prefix}.
  3. The server returns the matching suffixes from Redis (or public range fallback).
  4. Your browser performs the final suffix check locally — the password is never transmitted.