Password Strength Checker
Analyze password entropy, crack time, and security — 100% client-side
Frequently Asked Questions
How is password strength calculated?
Strength is measured using Shannon entropy — the number of bits of randomness in your password. A password with 80+ bits of entropy is considered strong against current GPU-accelerated cracking methods.
Is my password sent anywhere?
No. All analysis happens locally in your browser. Your password never leaves your device.
What crack time estimate do you use?
We assume 10 billion guesses per second (state-of-the-art GPU cluster). The actual time could be longer depending on the hashing algorithm used by the service storing your password.