Password Generator

About This Password Generator

This advanced password generator creates strong, secure passwords using client-side JavaScript. No passwords are sent over the internet or stored on servers.

Features:

• Random passwords with custom length (4-128 characters)
• Memorable passphrase mode (word-based, with separators)
• Character type selection (lowercase, uppercase, numbers, symbols)
• Exclude similar (i, l, 1, O, 0) and ambiguous characters
• Entropy-based strength meter with crack-time estimate
• Custom pattern option for specific password formats
• Generate multiple passwords at once (bulk)
• Password history with copy functionality
• Dark mode support

All generation uses your browser's cryptographically secure random number generator (crypto.getRandomValues) with rejection sampling to avoid bias.

Password Strength:

Strength is based on entropy — the number of bits of randomness, calculated as length × log₂(character-set size). More bits means exponentially harder to crack.

• Weak: Under 40 bits — vulnerable to brute force
• Fair: 40-59 bits — better, but not recommended
• Good: 60-79 bits — reasonable for most accounts
• Strong: 80-99 bits — good for sensitive accounts
• Very Strong: 100+ bits — extremely secure

Remember to use different passwords for different accounts and consider using a password manager!