Password Generator

Generate strong, random passwords locally in your browser

Formula

Entropy = length x log2(charset_size). 128 bits = cryptographically strong. Generated using crypto.getRandomValues().

Password strength is measured in bits of entropy. Each character adds log2(N) bits where N is the character set size. Longer passwords with larger character sets have exponentially more entropy.

How to Calculate Manually

1
Choose password length (12+ recommended)
2
Select character types to include
3
Optionally exclude similar/ambiguous chars
4
Choose how many passwords to generate
5
Click generate - all done locally in browser

Reference Table

Length	Charset	Entropy	Time to Crack (est.)
8 chars	Lowercase only	37.6 bits	Minutes
8 chars	All (94)	52.4 bits	Hours
12 chars	All (94)	78.6 bits	Centuries
16 chars	All (94)	104.8 bits	Billions of years
20 chars	All (94)	131 bits	Heat death of universe
16 chars	Alphanumeric (62)	95.3 bits	Billions of years
24 chars	Diceware (7776)	131 bits	Heat death of universe

Password Generator: Create Strong, Secure Random Passwords

Passwords are the keys to your digital life. Weak passwords are the #1 cause of account breaches. A strong password must be long, random, and unique for each account. This generator creates passwords locally in your browser using cryptographically secure random number generation - no data ever leaves your device...

Frequently Asked Questions

Is this password generator secure? Yes! Passwords are generated entirely in your browser using cryptographically secure random number generation (crypto.getRandomValues). Nothing is sent to any server.: Yes! Passwords are generated entirely in your browser using cryptographically secure random number generation (crypto.getRandomValues). Nothing is sent to any server.
What makes a password strong? Length (12+ chars), complexity (mixed case, numbers, symbols), and randomness. Avoid dictionary words, patterns, or personal info.: Length (12+ chars), complexity (mixed case, numbers, symbols), and randomness. Avoid dictionary words, patterns, or personal info.
How long should my password be? Minimum 12 characters for general use. 16+ for sensitive accounts. 25+ for master passwords or encryption keys.: Minimum 12 characters for general use. 16+ for sensitive accounts. 25+ for master passwords or encryption keys.

Calculator

Formula

Formula

How to Calculate Manually

Reference Table

Password Generator: Create Strong, Secure Random Passwords

Frequently Asked Questions

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