Strong, unique passwords are the foundation of online security. A good password is long (16+ characters), uses a mix of character types, and is random - not based on dictionary words or personal information. This tool generates cryptographically secure passwords with customizable length and character requirements, and estimates password strength and crack time.
Set the password length using the slider (4 to 64 characters), toggle character types (uppercase, lowercase, digits, special characters), and click 'Generate'. The tool shows a password strength meter based on entropy calculation and estimated crack time. You can exclude ambiguous characters (0, O, l, 1, I) for better readability and generate multiple passwords at once.
Strong password generation is essential for creating secure credentials for web accounts, generating master passwords for password managers, creating database passwords for production systems, generating API keys and webhook secrets, producing temporary passwords for user account provisioning, creating encryption passphrases, and generating Wi-Fi network passwords that are both secure and shareable.
Passwords are generated using crypto.getRandomValues() for cryptographic security. Password strength is measured in bits of entropy: entropy = length * log2(characterSetSize). For example, a 16-character password using the full 94-character printable ASCII set has ~105 bits of entropy. Crack time estimation assumes 10 billion guesses per second (high-end GPU cluster). Characters are selected randomly from the combined character pool without guaranteed representation from each type.
Security experts recommend at least 12 characters, with 16+ being ideal. Each additional character exponentially increases the number of possible combinations. A 16-character password with mixed character types would take billions of years to brute-force with current technology.
A strong password is: (1) long - at least 12-16 characters, (2) random - not based on dictionary words or patterns, (3) mixed - uses uppercase, lowercase, digits, and special characters, and (4) unique - not reused across different accounts.
No. Passwords are generated entirely in your browser using the Web Crypto API. Nothing is stored, transmitted, or logged. You can verify this - the tool works even with your internet disconnected.
Yes. A password manager lets you use long, unique, random passwords for every account without memorizing them. Popular options include Bitwarden, 1Password, and KeePass.
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