Password Strength Checker

See how strong a password is and roughly how long it would take to crack. This runs entirely in your browser — your password is never sent anywhere, logged, or stored. Type or paste to test it.

FAQ

Is it safe to type my password here?

Yes. The check runs entirely in your browser with JavaScript — your password is never sent over the network, logged or stored. You can disconnect from the internet and it still works. Still, as a habit, avoid pasting real passwords into sites you don't trust.

How is password strength measured?

It estimates entropy in bits from the length and the variety of character types used (lowercase, uppercase, digits, symbols). More length and more variety mean more bits, which means exponentially more guesses to crack.

What makes a strong password?

Length is the biggest factor — a long passphrase of several random words usually beats a short complex string. Aim for 12+ characters (16+ is better), mix character types, and never reuse passwords across sites. A password manager makes this painless.

What is a good crack time to aim for?

The estimate here assumes fast offline guessing. Aim for an estimate in centuries or more. If it shows seconds, hours or days, lengthen the password and add character variety.

Need a strong one? Try the password generator. More: the full tools list.