Generate random UUIDs (v4) and validate existing UUIDs.
UUID (Universally Unique Identifier) is a 128-bit identifier that is unique across all devices and time. This tool generates version 4 UUIDs using cryptographically secure random numbers.
UUID v4 Format:
xxxxxxxx-xxxx-4xxx-[89ab]xxx-xxxxxxxxxxxx
4 = version, [89ab] = variant