Password Strength Checker
Evaluate your password's entropy and strength. Everything is calculated client-side in your browser.
Strength: NoneEntropy: 0.0 bits
Criteria Checklist
- ○At least 8 characters
- ○Uppercase letter (A-Z)
- ○Lowercase letter (a-z)
- ○Number (0-9)
- ○Symbol (e.g. !@#$%)
How is password strength calculated?
Password strength is calculated using entropy. We analyze the length of your password and the character sets used (lowercase, uppercase, numbers, and symbols) to determine the mathematical probability of an attacker guessing it. We also check against common dictionaries and predictable patterns (like "123456").
Is it safe to type my password here?
Yes. This tool is 100% client-side. The strength calculation happens entirely inside your browser's memory using JavaScript. No network requests are made, and your password is never stored or sent to any server.