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UUID Generator

A Universally Unique Identifier (UUID) is a 128-bit number used to identify information in computer systems.

UUID version
Quantity

What it is

A Universally Unique Identifier (UUID) is an identifier standard used in software development. The number of possible UUIDs is 16^32, which is 2^128 or about 3.4x10^38.

How it works

Select the desired UUID version and the quantity of identifiers to generate. You can instantly refresh the list or copy all results to the clipboard.

  • v1: Generated based on the current time and MAC address (or a random number).
  • v4: Fully random identifier, the most commonly used version.
  • v3 and v5: Deterministic UUIDs based on a namespace and a name.

Limitations & notes

  • Generation occurs entirely on the client-side in your browser.
  • For versions v3 and v5, the results will be identical for the same input data (namespace + name).
  • UUID v4 has an extremely low collision probability, making it safe for most applications.

FAQ

  • Which version should I choose? If you just need a unique ID, choose v4.
  • Is it safe? Yes, no data is sent to the server.
  • What is NIL UUID? It's a special UUID consisting of all zeros.