UUID Generator

A row needs an id you did not type by hand. UUID Generator makes one version-4 UUID each time you click Generate.

One v4, from the browser

There is no text box to seed and no count field. Generate calls crypto.randomUUID and shows one id. Click again for another. The value is the RFC version-4 shape: random bits, with the version and variant digits in the usual places. It is not version 7, so it does not sort by time. It is not a Nano ID and not a ULID. /blog/uuid-vs-nanoid-vs-ulid compares those shapes if you are choosing an id style. The id is lowercase hex with hyphens, which is what crypto.randomUUID returns.

What random means here

The browser supplies the random bytes. This screen does not use a clock or a counter. Two clicks will not produce a sequence you can predict from the first value. Collision odds for version 4 are tiny for ordinary app data, and this tool does not check a database for you. UUID v7 Generator is the time-ordered sibling. Nano ID Generator and ULID Generator are shorter or different alphabets. Password Generator builds a login string, not a primary key. Nothing here checks that the id is new in your database.

When a UUID is the wrong token

Do not use the result as a password or as a signing secret. It is an identifier. API Key Generator and Random Token Generator are for secrets you will treat as credentials. Hash Generator digests text you already have. A batch of ids is not offered here. Generate, copy, and generate again if you need a second row. The previous id is not saved. Copy it before you generate the next one, because this screen keeps only the latest value.