Test how strong a password is — its estimated entropy, how long it would take to crack offline, and specific weaknesses to fix — without your password ever leaving your device.
How it works
- Type a sample password into the input field.
- The client-side algorithm calculates entropy based on character sets and length.
- Review the estimated crack time and read suggestions to improve password strength.
Frequently asked questions
Is my password sent anywhere?
No — all analysis runs locally in your browser. Nothing is transmitted, logged, or stored.
What makes a password strong?
Length above all, plus a mix of character types and no predictable patterns or dictionary words. A long passphrase beats a short complex one.
What is entropy in bits?
A measure of unpredictability. Each extra bit doubles the guesses needed; 60+ bits is reasonable, 80+ is strong.