Estimate how strong a password is and how long it might take to crack.
Checked entirely in your browser — your password is never sent or stored.
Understanding your result
Strength comes mainly from length and unpredictability. Avoid names, dates and common words even when they look complex.
Formula and method
Entropy ≈ length × log2(pool size), where the pool grows with each character type used. Crack time assumes a fast offline attacker; treat it as a guide, not a guarantee.
Worked example
A 12-character password mixing cases, numbers and symbols typically reaches a “strong” rating, while a short dictionary word rates “very weak”.
How to use this tool
- Type or paste the password.
- The strength updates instantly.
Common mistakes to avoid
- Assuming swapping letters for look-alike symbols (p@ssw0rd) makes a weak password strong.
About the Password Strength Checker
Test how resistant a password is to guessing. This tool estimates entropy and a rough crack time based on length and character variety.
Explore all Security and Privacy tools
Frequently asked questions
Is my password sent anywhere?
No. The check runs entirely in your browser and nothing is transmitted or logged.