Strong Password Generator
Generate cryptographically strong passwords instantly. Every password is created using your browser's secure random number generator — nothing is transmitted or stored.
Password Generator
Generate strong, cryptographically secure random passwords.
How it works
- Passwords are generated using the
crypto.getRandomValues()Web Crypto API for cryptographic randomness. - Everything runs in your browser — no passwords are sent over the network.
- Strength is estimated from entropy (password length × log₂ of character pool size).
What makes a password strong?
A strong password has three properties: length (16+ characters), randomness (not based on dictionary words or personal info), and character diversity (uppercase, lowercase, digits, symbols). A truly random 16-character password with all character types would take billions of years to brute-force with current technology.
Password length recommendations
NIST recommends passwords of at least 8 characters, but security experts recommend 16+ for important accounts. Each additional character exponentially increases the time to crack: a 12-character random password has ~71 bits of entropy, while 16 characters has ~95 bits. For maximum security, use 20+ characters.
Frequently Asked Questions
How long should a strong password be?
At minimum 12 characters, ideally 16+. With a mix of uppercase, lowercase, digits, and symbols, a 16-character password has approximately 95 bits of entropy — effectively uncrackable by brute force.
Are generated passwords truly random?
Yes. This tool uses the Web Crypto API (crypto.getRandomValues), the same cryptographic random number generator used for TLS encryption. The randomness is suitable for security-critical applications.