Generate Secure Password
Crack Time Estimation
Why Strong Passwords Matter
Weak passwords are the leading cause of account breaches. A strong password protects your digital identity, financial assets, and sensitive data from unauthorized access.
Understanding Password Strength
Password strength is measured by:
- Length: Longer passwords exponentially harder to crack
- Complexity: Mix of character types increases difficulty
- Entropy: Randomness measured in bits - higher entropy = stronger
- Predictability: Avoid common words, patterns, and sequences
NIST 800-63B Compliance
Per NIST SP 800-63B guidelines:
- Minimum 8 characters, recommend 64+ for high-security
- No composition rules (mixing character types)
- No periodic password resets required
- Screening against common passwords dictionary
- Password length is more important than complexity
- Allow users to see passwords during entry
Password Entropy Explained
Entropy measures password randomness in bits. Each additional bit doubles the number of possible combinations.
- 28 bits: Very weak - crackable in hours
- 36 bits: Weak - crackable in days
- 60 bits: Strong - crackable in centuries with brute force
- 80+ bits: Very strong - practically uncrackable
Common Password Mistakes
- Using personal information (birthdays, names, pet names)
- Sequential patterns (password123, qwerty)
- Reusing passwords across multiple accounts
- Short passwords under 12 characters
- Dictionary words alone
How This Tool Generates Passwords
This tool uses the Web Crypto API's crypto.getRandomValues() for cryptographically secure random number generation. The entropy source is suitable for security-sensitive applications.
When to Use This Tool
- Creating new account passwords
- Updating expired passwords
- Generating service account credentials
- Creating API keys (use as starting point, add prefix)
- Password manager master password generation
References
Frequently Asked Questions
How does Password Generator work?
Generate strong passwords with a live strength breakdown that shows what makes them weak. Custom length, character sets and a pronounceable option. Free. Everything runs locally in your browser for instant results and maximum privacy.
Is my data private when I use Password Generator?
Yes. Password Generator runs entirely in your browser using client-side JavaScript. Your input is never uploaded to any server, never logged, and never shared. Closing the tab clears everything from memory.
Do I need to sign up or create an account to use Password Generator?
No. Password Generator is 100% free with no signup, no email registration, no payment, and no ads. Open the page and start using it immediately.
Is the output of Password Generator truly random or unique?
Yes. Password Generator uses cryptographically secure random number generation (crypto.getRandomValues) sourced from your operating system's entropy pool, not Math.random(). Output is suitable for security-sensitive applications.
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