Password Generator - Create Strong Random Passwords
Generate cryptographically secure passwords with customizable length and complexity. Create strong passwords that resist brute force and dictionary attacks.
What is Password Generator?
A Password Generator creates high-entropy, random passwords that are resistant to common attack methods like brute force, dictionary attacks, and credential stuffing. Unlike human-created passwords, generated passwords have no predictable patterns.
This tool uses the Web Crypto API to ensure true randomness:
- Up to 64 characters - Longer passwords exponentially increase security
- Customizable character sets - Uppercase, lowercase, numbers, symbols
- Configurable complexity - Set minimum requirements for each character type
- Character exclusion - Remove similar characters (l, 1, I, 0, O) to avoid confusion
Password strength is measured in entropy bits. A 12-character password using all character sets has approximately 78 bits of entropy, requiring billions of years to crack with current technology.
Examples
Strong password (16 chars, all sets)
Input:
Length: 16, All character typesOutput:
Kx9#mP2$vL7@nQ4!Memorable password (passphrase)
Input:
Length: 24, Words modeOutput:
correct-horse-battery-staplePIN-style (numbers only)
Input:
Length: 6, Numbers onlyOutput:
847293Generate Password in Node.js
const crypto = require('crypto');
function generatePassword(length = 16) {
const charset = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*';
const chars = [];
const values = crypto.getRandomValues(new Uint8Array(length));
for (let i = 0; i < length; i++) {
chars.push(charset[values[i] % charset.length]);
}
return chars.join('');
}
// Generate 16-char password
const password = generatePassword(16);
console.log('Generated:', password);Common Mistakes
- ✗Reusing passwords across sites - A breach on one site exposes all your accounts.
- ✗Using personal information - Names, birthdays, and addresses are easily guessed.
- ✗Making minor variations - 'Password1!' to 'Password2!' is not a secure change.
- ✗Storing passwords in browsers - Browser storage is often unencrypted and syncs across devices.
- ✗Sharing passwords via email or chat - Use a dedicated password sharing feature or secure channel.
🔐 Security Note
Generated passwords are created in your browser and never transmitted. For production use, combine with a password manager to store unique passwords for each account. Enable two-factor authentication wherever possible.
Frequently Asked Questions
What makes a password strong?▼
A strong password has high entropy, meaning it's unpredictable. Key factors include: length (minimum 12 characters), complexity (mix of uppercase, lowercase, numbers, symbols), and randomness (no dictionary words or patterns). A 16-character random password with all character types provides excellent security.
How long should my password be?▼
Minimum 12 characters for most accounts, 16+ for sensitive accounts (banking, email, password manager). Each additional character exponentially increases the time to crack. For modern security standards, passphrases of 4-6 random words are both secure and memorable.
Is this password generator safe to use?▼
Yes. Passwords are generated using the Web Crypto API's cryptographically secure random number generator. Generation happens entirely in your browser - no data is sent to any server. However, always use a reputable password manager to store your passwords securely.
Should I use a password manager?▼
Absolutely. A password manager allows you to use unique, strong passwords for every account without memorizing them. Modern password managers encrypt your vault with a master password, and many offer secure password sharing and breach monitoring.