Password Generator

A strong password has three key properties: length (at least 16 characters), character diversity (mix of uppercase, lowercase, numbers, and symbols), and randomness (not based on dictionary words or personal info). Length is the most impactful factor — each extra character multiplies the number of possible passwords exponentially. Our generator measures strength using entropy bits, which represents how many guesses an attacker would need on average.

Yes. This is a free online password generator that runs entirely in your browser using crypto.getRandomValues() — the Web Cryptography API's secure random number generator. No password is ever transmitted to a server, logged, or stored. It is safe to use even for sensitive accounts. The only difference from a desktop password manager like 1Password or LastPass is that we don't store or autofill — we only generate.

Security experts recommend at least 16 characters for important accounts (banking, email, social media). For critical infrastructure or admin accounts, 24–32 characters is ideal. A 20-character password with mixed character types has over 130 bits of entropy, which would take longer than the age of the universe to brute-force with current hardware. Our strong password generator defaults to 20 characters to give you a good balance.

Absolutely. Since strong passwords are inherently difficult to memorise, a password manager (like Bitwarden, 1Password, or KeePass) is essential for using them in practice. Generate a strong password with our tool, then save it in your password manager. Never reuse passwords across sites — if one service is breached, attackers will try your password everywhere else (credential stuffing).

Entropy bits measure how unpredictable a password is. A password with N bits of entropy requires 2^N guesses in the worst case to crack. As a reference: 40 bits is weak, 60 bits is moderate, 80 bits is strong, and 100+ bits is very strong. Our tool calculates entropy as length × log₂(charsetSize). A 20-character password using all character types (95-char set) has about 131 bits of entropy — essentially uncrackable.

Some characters look visually similar and can cause confusion when reading a password aloud or copying it manually — for example: 0 (zero) vs O (letter O), 1 (one) vs l (lowercase L) vs I (uppercase i). Enabling "Avoid Ambiguous" removes these characters from the pool, making the password easier to transcribe. This trades a tiny amount of entropy for a significant reduction in human error.