Password Leak Checker
Find out whether a password already appears in public breach data — without ever sending the password itself.
Hashed in your browser. Only a five-character hash prefix is ever sent.
What is a Password Leak Checker?
A password leak checker tells you whether a password has already appeared in a public data breach. Modern attacks rarely involve guessing: attackers replay billions of previously exposed passwords against login forms, a technique called credential stuffing. If your password is on those lists, its length and complexity no longer matter.
This tool uses k-anonymity. Your password is hashed with SHA-1 inside your browser, and only the first five characters of the hash are sent to the lookup service. The service returns every hash sharing that prefix and the match is completed locally, so no one — including us — learns which password you checked.
When to use it
How SafePasswordMaker Protects You
K-Anonymity Lookup
Only the first five characters of the hash ever leave your device.
Password Never Sent
Your actual password is never transmitted or stored.
Hashed Locally
SHA-1 hashing happens in your browser before any request.
Free & Unlimited
No sign-up, no rate cards, no logging.
Frequently Asked Questions
Replace a leaked password now
Generate a long, unique password in your browser and store it safely.