Password Generator
Generate strong, random passwords entirely in your browser. Nothing is sent to a server.
Passwords are generated using crypto.getRandomValues() from the Web Crypto API: cryptographically random numbers, not the pseudo-random output of Math.random(). Every character is picked locally in your browser; no password is ever transmitted to or stored on a server.
Password Generator
Generate cryptographically secure passwords using the Web Crypto API.
This generator uses the Web Crypto API's crypto.getRandomValues with rejection sampling to pick characters without modulo bias, producing cryptographically secure passwords entirely in your browser. Nothing is sent to a server or logged.
Why Randomness Source Matters
Not all “random” numbers are suitable for generating passwords. JavaScript's Math.random() is a pseudo-random number generator designed for speed, not security. Its internal state can, in principle, be reconstructed from enough observed outputs, which makes it unsuitable for anything security-sensitive.
This tool instead uses crypto.getRandomValues(), part of the Web Crypto API. It draws entropy from the operating system's cryptographically secure random number generator, the same class of source used to generate encryption keys. There is no seed to reverse-engineer and no observable pattern between successive calls.
Length matters more than complexity rules.A longer password drawn from a smaller character set can be just as strong as a shorter one with symbols mixed in, because password strength against brute-force guessing is a function of the total number of possible combinations. Every additional character multiplies that number by the size of your character set: for a 95-character set, each extra character multiplies the search space by roughly two orders of magnitude. That's why we default to 20 characters rather than the 8-character minimums still required by some legacy systems.
It also helps to know what generated passwords are protecting against, and what they aren't. A long, random password from this tool defeats brute-force and dictionary attacks by making the search space too large to exhaust with current hardware, but it does nothing against phishing, where you're tricked into typing the correct password into a fake login page, or against malware that logs keystrokes directly on your device. Pairing a generated password with a password manager closes part of that gap, since a manager will only autofill credentials on the exact domain they were saved against, making a lookalike phishing site visibly fail to trigger autofill.
One more practical note: character-set restrictions imposed by some sites (no symbols, a short maximum length) directly reduce the achievable entropy, regardless of how the password was generated. If a site caps you at 12 characters with letters and numbers only, that's the ceiling on your protection no matter how the password was produced. The fix in that case isn't a smarter generator, it's treating that specific account as a weaker link and relying more heavily on multi-factor authentication where it's offered.
Common Use Cases
New account signups
Generating a fresh random password at signup, rather than reusing one from memory, removes the temptation to fall back on a pattern that's easy to remember and therefore easier to guess.
Rotating a credential after a breach notice
When a service you use discloses a breach, generating a new random password immediately, sized to whatever that service's maximum length allows, is the fastest way to close the exposure.
API keys and service secrets
A long, random string is exactly what most services expect for a shared secret or an internal service-to-service credential, and generating one locally avoids emailing a self-chosen value around.
Temporary credentials for a demo or staging environment
Spinning up a throwaway environment for a demo or a client review still deserves a real random password, not a placeholder like "test123" that might outlive the environment it was meant for.
Frequently Asked Questions
How are passwords generated, and are they truly random?
Yes. Passwords are generated using crypto.getRandomValues(), the browser's cryptographically secure random number generator. They are not derived from a seed or clock and cannot be predicted.
Are generated passwords stored or logged anywhere?
No. Generation happens entirely in your browser and the output is never transmitted to any server or stored by this site.
How long should my password be?
For most accounts, 16–20 characters with a mix of uppercase, lowercase, numbers, and symbols provides strong security. Longer is always better: a 20-character random password is computationally infeasible to brute-force with current hardware.
Why include symbols in a password?
Including symbols expands the character set, which multiplies the number of possible combinations an attacker must try. A 20-character password drawn from 95 printable ASCII characters has approximately 10^39 possible values.
Further Reading
Password Entropy: How Random Is Random Enough?
What entropy actually measures, how length and character sets affect it, and how to pick a password length that resists brute-force.
Why Strong Passwords Matter: Real Attack Vectors and How to Defend Against Them
How weak or reused passwords actually get broken: credential stuffing, brute force, phishing, and rainbow tables, and how to generate passwords that hold up.
Why Your Password Manager’s Generator Might Be Weaker Than You Think
How to check whether a password generator, including the one built into your password manager, is actually using cryptographically secure randomness.
SHA-256 vs bcrypt vs Argon2 for Password Storage
Why a fast general-purpose hash like SHA-256 is the wrong tool for storing passwords, and how bcrypt and Argon2 close that gap.