Password Strength Analyser

Discover the strength of your password with this client-side-only password strength analyser and crack time estimation tool

Your password is never sent to any server. All analysis is performed locally in your browser.

About Password Security

Password security is a critical aspect of online safety. A strong password is your first line of defense against unauthorized access to your accounts and sensitive information.

Key characteristics of strong passwords:

  • Length: Longer passwords are generally more secure (12+ characters recommended)
  • Complexity: A mix of uppercase, lowercase, numbers, and special characters
  • Unpredictability: Avoid common patterns, dictionary words, and personal information
  • Uniqueness: Using different passwords for different services

Common Password Vulnerabilities:

  • Dictionary words and common substitutions (e.g., "p@ssw0rd")
  • Sequential patterns (e.g., "12345" or "qwerty")
  • Personal information (names, dates, etc.)
  • Repeating characters or patterns
  • Previously breached passwords

This tool uses zxcvbn, a password strength estimator developed by Dropbox. It analyzes passwords based on pattern matching and frequency lists to provide realistic estimates of password crackability.