A UUID (Universally Unique Identifier) is a practically unique 128-bit identifier, used to name resources without central coordination. This tool generates several at once: v4 (fully random, the most common), v7 (includes a timestamp, so it is chronologically sortable) and NIL (the null UUID, all zeros). Everything is generated locally with the browser Crypto API.

Example (v4): 3f50a8c2-... — pick the version, the amount and press Generate.