Password Strength Analyzer
Check how secure your password is
How to Use
Enter password
Type or paste the password you want to analyze.
View strength score
See the overall strength rating and entropy calculation.
Check vulnerabilities
Review warnings about patterns, dictionary words, or common passwords.
Improve if needed
Use the suggestions to create a stronger password.
Frequently Asked Questions
How is password strength calculated?
We analyze entropy (randomness), length, character variety, common patterns, dictionary words, and known leaked passwords to give a comprehensive strength score.
Is my password sent to a server?
Never. All analysis happens entirely in your browser. Your password never leaves your device.
What makes a password weak?
Short length, dictionary words, common patterns (123456, qwerty), personal info, repeated characters, and passwords found in data breaches.
What is entropy in password strength?
Entropy measures randomness in bits. Higher is better. 40 bits is weak, 60 bits is moderate, 80+ bits is strong. Each additional bit doubles the cracking difficulty.
Why does my password show as weak despite being long?
Length alone isn't enough. Patterns like "password12345678" or repeated characters reduce actual entropy. True randomness is key.