100% Private · Nothing is sent to our servers

Password Strength Checker

Check your password strength and see if it's been exposed in a data breach — using HIBP's k-anonymity model.

Have I Been Pwned Check

Uses HIBP's k-anonymity model — only the first 5 characters of the SHA-1 hash are sent. Your password never leaves your device in any identifiable form.

Privacy first. Strength analysis runs entirely in your browser. The HIBP check uses k-anonymity — only a 5-character hash prefix is transmitted, making it mathematically impossible to reverse to your password.