Test your password security in real time — no data is stored or transmitted
Password strength is calculated based on multiple factors: length, character variety, randomness, and whether the password matches known common passwords.
Entropy measures the unpredictability of your password in bits. A password with higher entropy requires exponentially more guesses to crack. Each additional character with a larger character set adds significant entropy.
The crack time estimate assumes an offline attack at 10 billion guesses per second — typical of a determined attacker with specialized hardware. Online attacks are much slower due to rate limiting.
Privacy: Your password is never sent anywhere. All analysis runs locally in your browser.