🔒 Password Strength Tester

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Enter a password

💡 Password Security Tips

  • Use at least 12 characters (longer is better)
  • Mix uppercase, lowercase, numbers, and symbols
  • Avoid common words, names, and patterns
  • Use a unique password for each account
  • Consider using a password manager
  • Enable two-factor authentication when available

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How Password Strength is Calculated

Password strength is measured by entropy - the amount of uncertainty an attacker faces. Higher entropy means more possible combinations and longer cracking time.

Entropy Formula

Entropy = log₂(character_set_size^password_length)

For example, an 8-character password with lowercase only has 37 bits of entropy, while a 12-character password with all character types has 78 bits.