Strong Password Generator
Generate cryptographically secure passwords in your browser with real-time entropy estimation and character pool controls.
All passwords are generated locally in memory using window.crypto.getRandomValues() and shuffled with a CSPRNG-seeded Fisher-Yates algorithm. No passwords or user selections are transmitted across the network or stored in cookies/localStorage.
Click Generate to start
Customize Password
*Generated password length is limited to 50 characters by the API.
Password Entropy & Brute-Force Resilience​
Password entropy is calculated as E = L * log2(N), where L is password length and N is the character pool size:
| Character Pool | Pool Size (N) | Minimum Recommended Length | Entropy Rating | Resilience |
|---|---|---|---|---|
| Digits Only | 10 | 20+ characters | ~66 bits | Moderate |
| Lowercase Letters | 26 | 16+ characters | ~75 bits | Strong |
| Alphanumeric | 62 | 14+ characters | ~83 bits | Very Strong |
| Full Set (Letters + Digits + Symbols) | 94 | 12+ characters | ~79 bits | NIST SP 800-63B Compliant |
| Full Set High-Security | 94 | 20+ characters | ~131 bits | Cryptographically Unfeasible to Brute Force |
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