UUID options UUIDs
Generate UUID v1, v4, and v5 values in common formats.
About UUID Generator
Generate 1, 5, 10, 50 or 100 UUIDs at once in version 1 (time-based), version 4 (random) or version 5 (from a namespace and a name), and copy them as standard, uppercase, without hyphens or in braces. Everything is generated in your browser with the uuid library. For version 5 the tool adds the position in the list to your name, so the first UUID is made from name-0, the second from name-1 and so on.
Frequently asked questions
Can two v4 UUIDs ever collide?
In theory yes, in practice no. A version 4 UUID has 122 random bits, and you would have to create about a billion of them every second for roughly 86 years before the chance of a single duplicate reaches 50 percent.
When should I use v5 instead of v4?
When the same input should always give the same UUID, such as an ID derived from a URL or an email address. This generator adds -0, -1 and so on to the name, so if you need the version 5 UUID of the name exactly as you typed it, use a UUID library in your own code.