Password Strength Checker
Test your password security
Strength
Enter a password
Length
0
Entropy (bits)
0
Crack Time (Online)
-
Crack Time (Offline)
-
Password Criteria
At least 8 characters
Contains uppercase letters
Contains lowercase letters
Contains numbers
Contains symbols
Not a common password
Frequently Asked Questions
How is strength calculated?
Based on entropy, length, character diversity, and whether it contains common patterns or dictionary words.
How long to crack my password?
An 8-char lowercase password takes seconds. A 16-char mixed password with symbols could take millions of years.
Is it safe to check my password here?
Yes. Analysis runs entirely in your browser. Your password is never sent to any server.
Why do some websites reject my strong password?
Some sites have outdated rules that limit password length or block certain special characters. A truly strong password is long and random. If rejected, try removing unusual symbols while keeping length above 16 characters.
What is entropy in password strength measurement?
Entropy measures password unpredictability in bits. Each bit doubles the number of possible combinations. A password with 80+ bits of entropy is considered very strong. Entropy depends on length and character variety.
Password Security Tips
Length matters: Use at least 12-16 characters for important accounts.
Mix character types: Include uppercase, lowercase, numbers, and symbols.
Avoid patterns: Don't use keyboard patterns (qwerty), sequences (12345), or personal info.
Use unique passwords: Never reuse passwords across different accounts.
Consider a password manager: Tools like 1Password or Bitwarden can generate and store strong passwords.