Password Generator — Free Online, Runs in Your Browser

What makes a password generator secure?

The key is where the randomness comes from. Stax Password Generator uses crypto.getRandomValues() — defined in the W3C Web Cryptography API specification as the browser's cryptographically secure pseudorandom number generator (CSPRNG). It is not predictable, not seeded from the time of day, and not replayable.

The generated password never leaves your device. No request carries it: copying it logs only that a copy happened, never its value.

How to choose the right settings

NIST's SP 800-63B Digital Identity Guidelines (the 800-63-4 edition) prioritize length over forced complexity rules, and say a system must not require a mix of character types.

• General accounts: 16 characters, all character sets enabled.
• PINs or numeric codes: numbers only, 6–8 digits.
• Passphrases (for memorization): use a passphrase generator instead — random words are easier to remember than random characters, but you need more of them for the same strength (four words from a 7,776-word list is about 52 bits).
• Legacy systems that cap at 8 characters: use all character sets at the maximum allowed length.

Password entropy explained

Entropy measures how unpredictable a password is, in bits. Each bit doubles the number of possible combinations. An 8-character password using only lowercase letters has about 38 bits of entropy (8 × log2 26), which is within reach of offline cracking if a site stored it with a fast hash. A 16-character password from this tool's full 88-character pool has about 103 bits (16 × log2 88), far beyond practical brute force.

Password manager recommendations

The safest approach is to use a different strong password for every account and store them all in a password manager. Leading options include Bitwarden (open-source, free tier is excellent), 1Password (paid), and KeePassXC (a local app that works fully offline). Avoid browser-saved passwords for critical accounts — they sync across devices but are accessible to anyone with physical access to your unlocked device.

Enable two-factor authentication (2FA) on your password manager and on all important accounts. Even if a password is leaked in a data breach, 2FA prevents an attacker from logging in without your second factor. Use an authenticator app (Google Authenticator, Authy) rather than SMS-based 2FA, which is vulnerable to SIM-swap attacks.