Password Generator
Generate strong, secure random passwords with custom length and character sets.
Password length: 16
Number of passwords
Character sets
Password security and entropy
Password strength is measured in entropy — the number of possible combinations. Entropy grows exponentially with length.
- All char types, 12 chars: ~79 bits (good)
- All char types, 16 chars: ~105 bits (very strong)
- Use a password manager (Bitwarden is free)
- Enable 2FA everywhere
What this tool does
Generates cryptographically random passwords using browser-native Math.random. Choose the length and which character sets to include. Longer passwords with all character types are exponentially harder to crack.
Input fields explained
Password length
The number of characters in each password. 12 is the minimum for security. 16–20 is recommended for important accounts. 32+ for high-security credentials like API keys.
Number of passwords
How many passwords to generate in one batch. Useful for generating options to choose from.
Character sets
Uppercase (A–Z), lowercase (a–z), digits (0–9), and symbols (!@#…). Each set you add exponentially increases the number of possible passwords and security. Symbols double the effective keyspace.
💡 Tips & context
→A 16-character password with all sets has more combinations than atoms in the observable universe.
→Never reuse passwords across sites. Use a password manager.
Formula / How it works
Characters selected randomly from chosen sets. 16-char password with all sets = ~10²⁶ combinations.