Password security
Type a password and get a plain-english read on its strength, the math behind it, and how long it would take an attacker to crack. Nothing leaves your browser.
About password entropy
Entropy is a measure of how unpredictable a password is, expressed in bits. More bits means more guessing before someone gets it right.
Entropy = length × log₂(pool size). The pool is how many distinct characters you could have used; length is how many you did.
Higher entropy means exponentially more combinations to try, which is what pushes crack times from seconds into centuries.
Everything is calculated on your device. The password never touches a server.
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