Password Strength Checker
Check password strength. Shows entropy, crack time estimate and improvement suggestions. Password never leaves your browser.
How to use
What makes a strong password?
A strong password has: 12+ characters, uppercase and lowercase letters, at least one number, at least one symbol, and avoids common words and patterns. The entropy score (in bits) measures how hard the password is to crack mathematically.
Crack time estimates
Crack time is estimated assuming an attacker trying 10 billion guesses per second (modern GPU). A 60-bit entropy password takes decades at this rate. An 80-bit+ password is effectively uncrackable with current technology.
Frequently asked questions
Is the Password Strength free to use?
Yes, the Password Strength is completely free. There is no sign-up, no account required, and no limit on how often you can use it.
Are the values from the Password Strength truly random?
The Password Strength uses your browser's cryptographically secure random number generator (Web Crypto API), the same standard used for password and security applications.
What devices does the Password Strength work on?
The Password Strength works on any device with a modern web browser — desktop, laptop, tablet, or phone. It is mobile-friendly and works offline once the page has loaded.