Password Generator is a free online tool that creates cryptographically secure random passwords using the browser's built-in Web Crypto API (crypto.getRandomValues). Customize length, character sets, exclude ambiguous characters, and generate multiple passwords at once — all without sending anything to a server.
Weak and reused passwords are the leading cause of account compromise. Dictionary attacks try common words and known-breached passwords first; credential stuffing takes a password leaked from one breached site and automatically tries it against thousands of other services, betting correctly that people reuse passwords; brute force simply tries every possible combination until one works. All three exploit predictability — either predictable word choices or a search space small enough to exhaust. The only reliable defense is a long, high-entropy password that is unique to each individual service, so a breach anywhere else never puts other accounts at risk.
Entropy is what actually determines how hard a password is to crack, and it is a function of both length and the size of the character pool, not "complexity" in the way people usually think about it. A 20-character password using only lowercase letters (26 possible characters per position) has roughly 94 bits of entropy — 20 × log2(26) — which is already far stronger than an 8-character password mixing upper, lower, numbers, and symbols (94 possible characters per position), which comes out to only about 52 bits. This is why security guidance has shifted over the last decade from "use a short password with mixed case, numbers, and symbols" toward "use a long password" — length compounds exponentially, character-set size only compounds linearly. This generator lets you push length up to 128 characters and independently toggle every character set, so you can dial in exactly the entropy a given service's password rules will accept.
Generation itself uses crypto.getRandomValues() rather than Math.random(). Math.random() is a pseudo-random number generator seeded for statistical distribution, not unpredictability — its internal state can in some engines be inferred from observed outputs, which makes it unsuitable for anything security-related. crypto.getRandomValues() pulls from the operating system's cryptographically secure random number generator, the same entropy source browsers use for TLS session keys, so the output is not just well-distributed but genuinely unpredictable.
You can also opt to exclude visually ambiguous characters (0, O, l, 1, I) that cause real-world friction when a password has to be typed manually — read off a screen, typed on a phone, or dictated over a call — rather than pasted from a manager. A real-time strength indicator rates the output using an entropy-aware scoring model rather than a naive length check. Generated passwords never leave your browser: there is no server-side logging, no API call, and no account required. For actual use, store the generated password immediately in a reputable password manager such as Bitwarden, 1Password, or KeePass rather than a text file, spreadsheet, or sticky note.
Need a unique identifier instead of a memorable secret? UUID Generator produces those using the same cryptographically secure random source.
