Generate strong random passwords
Built & maintained by Pappu Venkata Subbi Reddy, founder of Clacify
The Password Generator creates strong, random passwords that resist brute-force and dictionary attacks. Choose the length and which character types to include — uppercase, lowercase, numbers, and symbols — and it generates a password using your browser's cryptographically secure random number generator. It also shows an estimated strength so you can see the benefit of adding length and variety. The single most effective defence against account compromise is a long, unique, random password for every site, ideally stored in a password manager. Because generation happens locally and nothing is transmitted, the passwords you create are never seen by any server.
Passwords are built by drawing characters from the pool you enable (uppercase A–Z, lowercase a–z, digits 0–9, and symbols) using the Web Crypto API's getRandomValues, a cryptographically secure pseudo-random number generator — far safer than Math.random for security purposes. Strength is gauged from entropy, calculated as length × log2(pool size): each added character and each enabled character set increases the number of possible combinations exponentially, which is why a 16-character mixed password would take astronomically long to brute-force. Generation is entirely local; no password is ever transmitted, logged, or stored.
JavaScript's built-in Math.random() is a fast, statistically-uniform random number generator, but it is not cryptographically secure — its internal state can, in principle, be reconstructed by observing enough of its output, because it was designed for things like games and animations, not security. The Web Crypto API's crypto.getRandomValues(), which this tool uses instead, draws from the operating system's cryptographically secure random number generator (CSPRNG) — the same class of source used to generate TLS session keys and encryption keys. For anything protecting an account, this is not a theoretical distinction: a password generator built on Math.random() is generating something that only looks random, and that is a meaningfully weaker guarantee than what this tool provides.
Entropy — the true measure of how hard a password is to guess — grows with length exponentially, not linearly. A random 8-character password using only lowercase letters has about 26^8 ≈ 209 billion possible combinations. Add uppercase, digits, and symbols (a pool of roughly 94 printable characters) and the same 8 characters jump to 94^8 ≈ 6 quadrillion combinations. Go to 16 characters with all four character types and you are past 10^31 combinations — a number large enough that brute-forcing it is not a "wait longer" problem, it is a "not happening with any hardware that will ever exist" problem.
This is why security guidance has shifted from "use symbols and change your password every 90 days" toward "use length." A 20-character passphrase made of ordinary words is often stronger and easier to remember than an 8-character jumble of symbols. This generator gives you both options — dial up the length for maximum strength, or enable every character class for maximum entropy per character — and shows the resulting strength so the trade-off is visible, not guessed at.
The single biggest real-world cause of account takeover is not brute-forcing — it is credential stuffing: attackers take email/password pairs leaked from one breached site and try them against every other major site, because so many people reuse the same password everywhere. A strong, unique password generated for each site defeats this entirely, since a leak on one service reveals nothing usable about your password on any other. The practical way to manage dozens of unique random passwords is a password manager, which remembers them so you do not have to — this tool is built to pair with one: generate here, save there, and never type a memorable-but-weak password into a login form again.
A strong password is at least 12 characters long and includes a mix of uppercase letters (A–Z), lowercase (a–z), numbers (0–9), and special symbols (!@#$%). It should not contain your name, birthday, or common words. A 16-character random password with all character types would take billions of years to crack by brute force.
Yes, on Clacify. Our password generator uses your browser's built-in cryptographic random number generator (crypto.getRandomValues) and runs 100% locally — generated passwords are never sent to any server, stored in any database, or logged anywhere.