Analyze which character types are used in your password
A character set is a group of similar characters: uppercase letters, lowercase letters, numbers, or symbols. A strong password uses multiple character sets because each additional character set dramatically increases the number of possible password combinations. For example, a password using only lowercase letters is much weaker than one combining uppercase, lowercase, numbers, and symbols.
Password strength is exponential with character set diversity. A password that uses only one character set (say, lowercase letters) has only 26 possible characters per position. Adding uppercase expands this to 52, adding numbers to 62, and adding symbols to 90+. This multiplicative increase in possibilities makes brute-force attacks exponentially harder. A missing character set type represents a major weakness that attackers will exploit.
This tool calculates the theoretical entropy of your password based on character set size and length. Entropy is measured in bits and represents the computational difficulty of guessing the password. A password with higher entropy is exponentially harder to crack. The entropy value shown represents the possible character pool size—larger pools create stronger passwords.
For optimal password security, always use at least three character sets, preferably all four. Length is equally important—aim for 12+ characters minimum. The combination of length and character variety creates passwords that are practically uncrackable by brute force. This analyzer helps you verify that your passwords meet these standards. If your password falls short, try our Random Password Generator or Passphrase Generator to create stronger alternatives.
Use our Password Strength Checker for real-time strength evaluation, explore our Password Strength Visualizer for visual analysis, test passwords with our Weak Password Checker, or create multiple passwords at once using our Password List Generator.
Standard symbols include: !@#$%^&*()_+-=[]{}|;:',.<>?/~`. Check your password requirements as some sites restrict certain symbols.
No. All analysis happens locally in your browser. Your password is never stored or transmitted anywhere.
Generally yes, but character variety (sets used) is more important than length alone. A 12-character password with all character types beats a 20-character one using only letters.