Secure Password Generator
Password length
16Character types
How this tool works
What it accepts, how to use it, and where your input is processed.
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How this tool works
What it accepts, how to use it, and where your input is processed.
CSPRNG Entropy
Uses the browser’s native crypto.getRandomValues() API for cryptographically secure pseudo-random number generation resistant to brute-force attacks.
Local processing
Generated strings are created in your browser and are not sent to a generation server. Close or refresh the tab to discard them.
NIST Compliant
Supports both high-entropy random strings and 4-8 word Diceware passphrases recommended by modern NIST SP 800-63B standards.
Password Strength vs. Brute-Force Crack Time
| Length & Type | Entropy | Estimated Crack Time (100B guesses/sec) | Recommendation |
|---|---|---|---|
| 8 chars (Numbers only) | ~27 bits | Instant (<1 ms) | Never use for logins |
| 8 chars (Mixed case) | ~45 bits | ~10 minutes | Vulnerable to GPU rigs |
| 12 chars (Upper, Lower, Digits) | ~71 bits | ~34 years | Standard everyday account |
| 16 chars (Full symbols) | ~105 bits | 1.2 Trillion Years | Banking, Email, Master Key |
| 5-Word Passphrase | ~65 bits | Centuries | Easy to remember, highly secure |
Security Best Practices (NIST & CISA Guidelines)
A 16-character phrase is exponentially harder to crack than an 8-character complex password.
If one service is breached, credential stuffing attacks compromise all accounts sharing that password.
Store generated 16+ character passwords in Bitwarden, 1Password, or Apple Keychain.
Two-factor authentication with an authenticator app (TOTP) prevents unauthorized access even if keys leak.
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