🔒 Privacy-First • ✅ No storage • ⚡ Fast
Password Leak Checker
Check if a password may have appeared in known breach datasets — without sending your full password. Your password is hashed locally. Only a short hash prefix is used for lookup (k-Anonymity).
Privacy mode runs offline checks only (length, entropy, reuse risk hints) and does not contact any API.
Turn it off to run a k-Anonymity breach check (recommended). Your full password is never sent.
How privacy works
- Password is hashed in your browser using SHA-1.
- Only the first 5 characters of the hash are sent.
- Your browser compares returned suffixes locally.
If your password is found
Change it everywhere you used it, use a unique password per site, and enable MFA. Consider using our Password Generator.