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Strong Password Generator

Create secure, random passwords with one click — customizable length and character sets, fully private.

Click Generate to create your password
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20

Generate Multiple Passwords

Passwords will appear here…
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How Strong Password Generation Works

This tool uses the browser's built-in cryptographically secure random number generator (crypto.getRandomValues()) to generate truly random passwords. Unlike Math.random(), this is suitable for security-sensitive use.

Password Security Best Practices

  • Length matters most — every additional character multiplies the combinations exponentially. A 20-character password is astronomically more secure than a 10-character one.
  • Use all character types — mixing uppercase, lowercase, numbers, and symbols maximizes entropy.
  • Never reuse passwords — use a unique password for every account. Use a password manager to store them.
  • Avoid personal information — names, birthdays, and dictionary words are vulnerable to targeted attacks.

Password Entropy

Entropy is measured in bits and represents the unpredictability of a password. Each character from a set of N possible characters contributes log₂(N) bits of entropy. A 20-character password using all character types (94 printable ASCII) has ~130 bits of entropy — effectively uncrackable with current technology.

Frequently Asked Questions

Does this tool store or transmit my passwords?
No. Password generation happens entirely in your browser using JavaScript. No passwords, no inputs, and no data of any kind are sent to any server. Close the tab and the passwords are gone.
How long should my password be?
For most online accounts: 16+ characters. For high-value accounts (banking, email, password manager master password): 20+ characters. The longer the better — length is the most important factor in password strength.
What's the best way to manage many strong passwords?
Use a password manager such as Bitwarden (free, open-source), 1Password, or Dashlane. They generate, store, and auto-fill passwords across your devices, so you only need to remember one master password.
Why exclude ambiguous characters?
Characters like 0 (zero), O (uppercase O), l (lowercase L), 1 (one), and I (uppercase I) look similar in some fonts and can cause errors when typing passwords manually. Excluding them makes passwords easier to type without reducing security significantly.