Password Strength Checker
Paste any password to get an instant security score, entropy in bits, and an estimate of how long it would take to crack. Everything runs locally — your password never leaves this page.
It is completely free, private and requires no signup.
Length is the single biggest factor in password strength.
A unique password per account limits the damage of any breach.
Store strong generated passwords in a reputable manager.
Two-factor authentication protects accounts even if a password leaks.
How it works
Paste any password to get an instant security score, entropy in bits, and an estimate of how long it would take to crack. Everything runs locally — your password never leaves this page.
Enter any password in the input field. The analysis updates live as you type.
See the strength level, entropy in bits and a realistic crack-time estimate.
Apply the tips to make your password dramatically stronger.
Examples & Data
| Password | Entropy | Crack time |
|---|---|---|
| 123456 | ~19 bits | Instant |
| password | ~37 bits | Minutes |
| Tr0ub4dor&3 | ~47 bits | Hours |
| Kx!9#mP2@vLq7$dR | ~95 bits | Centuries |
The longer and more varied the password, the more entropy and the harder it is to crack.
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Ready to try it?
It is completely free, private and requires no signup.
Use the tool nowFrequently Asked Questions
We estimate the entropy (predictability) in bits based on length and the character types used. Higher entropy means exponentially harder to brute-force.
No. The strength check runs entirely in your browser with JavaScript. Nothing is transmitted, stored or logged.
Use at least 12 characters, ideally 16 or more, mixing lowercase, uppercase, numbers and symbols.
Entropy measures unpredictability. Each extra bit doubles the number of guesses required, making brute-force attacks exponentially harder.
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