Password Strength Checker
How strong is your password?
Password strength is estimated from entropy — bits of randomness derived from length and character variety. This checker rates a password and estimates crack time, entirely in your browser (nothing is sent anywhere). The fastest way to get stronger is almost always more length.
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Entropy
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bits of randomness
Est. time to crack
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at 10 billion guesses/sec
Tips
Frequently asked questions
How is password strength measured?
Usually with entropy — bits of randomness from length × the character-set size. More length and more character types → higher entropy → longer to crack.
Is it safe to type my real password here?
This runs entirely in your browser and never sends anything. As a habit, avoid typing real passwords into sites you don't fully trust.
What's a good entropy?
Below 40 bits is weak, 60–80 is reasonable, 100+ is very strong. Increasing length is the easiest way to raise it.
Crack-time estimates are rough approximations assuming a fast offline attack, for guidance only.