Password Strength Visualizer
Type a password to see exactly how its mathematical complexity (entropy) affects how long a hacker would need to crack it.
Test Your Password
Type a password below to see how long it would take a hacker to guess it using a modern computer. None of this data leaves your browser.
Assuming 100 billion guesses per second
Mathematical complexity score
Why length matters more than complexity
Many websites force you to create passwords like P@ssw0rd1! by requiring a mix of uppercase, lowercase, numbers, and symbols. While this adds complexity, the password is still short. A modern cracking rig can guess a short, complex password very quickly.
However, if you use a "passphrase" made of multiple random words (like correct horse battery staple), the sheer length of the password makes the mathematical combinations so massive that it would take centuries to crack, even without special symbols.