Password Generator - Create Strong Secure Passwords

Generate cryptographically secure passwords with customizable length, character types, and entropy calculation. All processing happens locally in your browser for maximum privacy and security.

Privacy-focused • No server storage • Instant generation
Generated Password
Your secure password with entropy calculation
Password Options
Customize your password generation settings
16 characters

Password Security Best Practices

Essential Password Guidelines

  • Use unique passwords for each of your accounts
  • Longer passwords (12+ characters) are generally more secure
  • Include a mix of uppercase, lowercase, numbers, and symbols
  • Avoid common words, personal information, or keyboard patterns

Advanced Security Tips

  • Consider using a password manager to store your passwords securely
  • Enable two-factor authentication when available
  • Regularly update passwords for sensitive accounts
  • Use our entropy calculation to verify password strength

How to Use the Password Generator

Step-by-Step Instructions

  1. Click "Generate New Password" to create your first secure password instantly
  2. Adjust the length slider to set your desired password length (8-64 characters)
  3. Toggle character type options to include or exclude uppercase, lowercase, numbers, and symbols
  4. Use "Exclude similar characters" to avoid confusing characters like 0, O, l, 1
  5. Click the "Copy" button to copy your password to clipboard
  6. Click the refresh icon to generate a new password with the same settings

Understanding Password Strength

Our tool displays password entropy in bits, which measures unpredictability. Higher entropy means stronger security:

  • Very Weak (0-30 bits): Easily cracked in seconds
  • Weak (30-50 bits): Can be cracked in minutes to hours
  • Good (50-70 bits): Takes days to weeks to crack
  • Strong (70-90 bits): Takes years to crack
  • Very Strong (90+ bits): Takes centuries to crack

How Our Password Generator Works

Cryptographic Security

Our password generator uses your browser's built-in cryptographically secure pseudorandom number generator (CSPRNG) to ensure maximum randomness and security. This is the same technology used by security professionals and cryptographic applications. The Web Crypto API provides access to a cryptographically strong random number generator that's suitable for generating passwords, tokens, and other security-sensitive values.

Entropy Calculation

Password entropy measures the unpredictability of a password. Higher entropy means a password is harder to crack. Our tool calculates entropy based on character set size and password length, helping you understand your password's true strength. The formula is: entropy = log2(character_set_size^password_length). For example, a 16-character password using all 94 printable ASCII characters has approximately 105 bits of entropy.

Privacy Protection

All password generation happens entirely in your browser using client-side JavaScript. No passwords are ever transmitted to our servers, logged, or stored anywhere. Your generated passwords remain completely private and secure. This approach ensures that even we cannot see or access your passwords, providing maximum privacy and security for your sensitive data.