About RandomKeyGenerator.com
RandomKeyGenerator.com is a free, browser-based tool for generating passwords, passphrases, AES encryption keys, UUIDs, and API tokens. It's built for people who want secure randomness without creating an account, installing anything, or trusting a server with their secrets.
Why we built this
Most online key and password generators say "cryptographically secure" without showing what that actually means or how it's implemented. Looking at how people talk about these tools, in reviews, comparisons, and forum threads, the same worry comes up again and again: is this thing actually generating and discarding my password locally, or is it sending it somewhere?
RandomKeyGenerator.com was built to answer that directly. Every generator mode on the tool page is built on the browser's own Web Crypto API, runs entirely client-side, and links to the actual standard or specification behind each method. Not just a claim of security, but the source for it.
How it works
Passwords, passphrases, encryption keys, API keys, and random hex strings are generated using crypto.getRandomValues(), which the Web Crypto API specification defines as returning cryptographically strong random values, a different category from JavaScript's built-in Math.random(), which is explicitly not suitable for security-sensitive use. UUIDs/GUIDs use crypto.randomUUID(), the same API's dedicated method for generating version-4 UUIDs from a cryptographically secure source. Both are implemented natively by the browser, not by this site's own code. RandomKeyGenerator.com only decides how to format and present the output.
The password/passphrase panel's length guidance is drawn from NIST Special Publication 800-63B Revision 4 (finalized July 2025), which recommends at least 15 characters when a password is the sole authentication factor, and notes that length matters more than forced character-composition rules. The underlying randomness mechanism (deterministic random bit generation) is described in NIST SP 800-90A. See What Is a CSPRNG? for the full explanation, with a live demo.
One technical nuance we think is worth stating plainly rather than glossing over: MDN's own documentation on getRandomValues() notes that for generating a key you'll use directly and non-extractably inside the Web Crypto API, SubtleCrypto.generateKey() is the preferred method. This tool exports plain hex or Base64 text, the form you'd paste into a config file, an environment variable, or another codebase, which is the common reason people reach for a browser-based key generator, and getRandomValues() is the right method for that. If you're wiring a key directly into a Web Crypto application instead, use generateKey(). See How the Web Crypto API Works for the full picture.
- NIST SP 800-63B Revision 4, Digital Identity Guidelines: Authentication and Authenticator Management, csrc.nist.gov
- NIST SP 800-90A Rev. 1, Recommendation for Random Number Generation Using Deterministic Random Bit Generators, csrc.nist.gov
- MDN Web Docs, Crypto: getRandomValues() method, developer.mozilla.org
- MDN Web Docs, Crypto: randomUUID() method, developer.mozilla.org
Our commitment
This tool is free to use, with no account and no data collection. The generator runs entirely in your browser, and nothing you create is ever sent to a server. It's independently maintained and updated as standards, like NIST's password guidance, change. Found a bug or have a feature idea? Get in touch.