🔐 Business & Security
Strong Password Generator
Generate cryptographically random, unbreakable passwords instantly. Customize length and character types, check strength, and generate in bulk. All generation happens in your browser — never stored or transmitted.
What Makes a Password Truly Strong?
Password strength is measured in entropy bits — a mathematical measure of unpredictability. The higher the entropy, the longer it takes to crack. Modern brute-force attacks can test billions of passwords per second using GPU clusters, so the bar is higher than most people realize.
Password strength by entropy
- Under 28 bits: Cracked in seconds. Never use.
- 28–35 bits: Cracked in minutes to hours. Weak.
- 36–59 bits: Cracked in hours to days. Moderate — only for low-value accounts.
- 60–127 bits: Would take years to centuries. Strong — use for most accounts.
- 128+ bits: Computationally infeasible to crack. Excellent — use for critical accounts.
Length vs complexity: which matters more?
Length wins. "correcthorsebatterystaple" (4 random words, 25 characters, lowercase only) has more entropy than "P@$$w0rd!" (9 characters, 4 character types). This is why NIST now recommends long passphrases over complex short passwords. Our generator uses all character types for maximum entropy per character.
Password Security Best Practices
- Never reuse passwords. One data breach exposes every account that shares the password.
- Use a password manager (Bitwarden, 1Password, Dashlane) to store unique passwords for every site.
- Enable 2FA on every important account — authentication apps are more secure than SMS.
- 16+ characters for financial accounts, email, and social media.
- Change passwords after any data breach — check haveibeenpwned.com regularly.
Frequently Asked Questions
Are the generated passwords stored anywhere?
No. All password generation uses JavaScript running entirely in your browser. The passwords never leave your device, are never sent to any server, and are not logged or stored anywhere. You can verify this by disconnecting from the internet — the generator still works perfectly.
How many possible combinations does a 16-character password have?
A 16-character password using uppercase, lowercase, numbers, and symbols (94 possible characters) has 94^16 = approximately 37 septillion (3.7 × 10^31) possible combinations. At 1 billion guesses per second, cracking it would take about 1.17 trillion years.
Should I use special characters in passwords?
Generally yes, but check the site's requirements first — some sites restrict certain special characters, which is frustrating. Our generator includes special characters by default. If a site rejects the generated password, uncheck symbols and regenerate.