Generators

Seven generators, each producing something new on demand. The common thread is randomness done properly: everything draws from the crypto.getRandomValues API, the operating system's entropy pool that also produces TLS session keys. Math.random() is never used anywhere on this site — it is a fast pseudorandom generator whose internal state can be recovered from a handful of outputs.

Entropy, and why rejection sampling matters

Random integers use rejection sampling rather than a modulo, because reducing a random value modulo a range that does not divide evenly skews the distribution — mapping 0 to 255 onto 0 to 5 gives four outcomes a 43 in 256 chance and two a 42 in 256 chance. Invisible in a single draw, obvious in a histogram over a million. Password Generator and Random Number Generator both draw from the same cryptographic source.

QR codes are about the payload, not the drawing

QR Code Generator emits the correct convention for each content type, so a Wi-Fi code starts WIFI:, a contact card BEGIN:VCARD, and there are forms for email, SMS and telephone. The hard ceiling is 2,953 bytes at version 40 with the lowest error correction, and choosing a higher correction level reduces capacity while letting the code survive damage. The tool reports the version and module count it settled on.

Names, handles and teams

Random Name Generator, Username Generator, Business Name Generator and Team Generator shuffle local word and name lists with Fisher-Yates, which produces every ordering with equal probability. Nothing is fetched from a server and no list is stored.

None of it leaves the page

Every generator runs in your own browser. That matters most for passwords, because a secret produced on a server is a secret that server has logged. Nothing is transmitted, nothing is stored, and the tools keep working with the network disconnected.