Password Strength Analyzer

Analyze password strength with entropy calculation, visual meter, common password checks, and time-to-crack estimates

Overview

The Password Strength Analyzer helps you understand what makes a password strong or weak by measuring entropy (randomness), checking against common passwords, detecting patterns, and estimating time-to-crack under various attack scenarios. Length matters more than complexity - a longer passphrase made of random words is often stronger and easier to remember than a short complex password.

Tips

  1. Test Length vs. Complexity: Compare “aB3$xY9&” (8 characters, complex) with “correcthorsebatterystaple” (25 characters, simple) - you’ll discover that length provides more entropy than complexity
  2. Avoid Common Passwords: Try entering “password123”, “qwerty”, or “letmein” to see how the tool detects and flags commonly used passwords from breach databases
  3. Understand Entropy: Observe how each additional character exponentially increases entropy - adding just 2-3 characters can change a password from “moderate” to “strong”
  4. Use the Password Generator: Generate random passwords with different character sets to see how mixing uppercase, lowercase, digits, and symbols affects strength
  5. Check Your Real Passwords Safely: While you can test your actual passwords here to understand their strength, remember to never enter real passwords on untrusted websites - use this tool for learning and testing similar patterns instead