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Strong Password Generator
Generate cryptographically secure random passwords using the Web Crypto API (crypto.getRandomValues). Customize length (8-128 characters) and character types: uppercase A-Z, lowercase a-z, digits 0-9, and special characters. All generation is client-side — passwords never leave your browser. Based on NIST SP 800-63B guidelines for memorized secrets.
16 chars
Frequently Asked Questions
What makes a password strong?
Per NIST SP 800-63B, password strength primarily depends on length — longer passwords are exponentially harder to crack. A 12-character password with mixed characters has approximately 72 bits of entropy. A 16-character password reaches 95+ bits. Avoid common patterns, dictionary words, and personal information. Each additional character multiplies the brute-force search space by the alphabet size.
Are generated passwords stored?
No, all password generation happens locally in your browser. Nothing is transmitted or stored anywhere.
How long should my password be?
NIST SP 800-63B recommends a minimum of 8 characters but acknowledges longer is better. For practical security: 16+ characters for general accounts, 20+ for email and financial accounts. At 10 billion guesses per second (modern GPU cluster), a 16-character random password with mixed types would take approximately 1.4 million years to brute-force.
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How to Use
- 1 Set the desired password length using the slider (8-128 characters).
- 2 Toggle character types: uppercase, lowercase, numbers, and special characters.
- 3 Click **Generate** to create a cryptographically secure random password.
- 4 Copy the password to your clipboard and use it immediately.