Password Generator
Create secure passwords and passphrases with configurable length and character sets, plus a live entropy estimate in bits. Uses the browser's crypto random source so nothing leaves your device.
Choose length, toggle character sets and watch estimated entropy grow. Passphrase mode picks real words with separators for memorable, strong secrets.
Options
Password
Nothing to show
Enable at least one character set.
Generated with crypto.getRandomValues() — the secure random source. Passwords are never stored, logged or transmitted.
Frequently asked questions
How is entropy calculated?
Entropy = length × log2(number of possible characters per position). It estimates the number of guesses needed to crack the password by brute force.
Why recommend a passphrase?
Passphrases of common words are easier to remember than gibberish yet retain high entropy — and they resist most automated attacks.