UUID Generator

Generate random v4 UUIDs instantly. Single or batch generation, copy to clipboard. Free, browser-based, no server required.

Click Generate

How to Use

  1. Click Generate to create a single UUID.
  2. Click Copy to copy it to clipboard.
  3. For multiple UUIDs, set the count (1–100) and click Generate Batch.
  4. Click Copy All to copy the entire list.

What is UUID v4?

Version 4 UUIDs are generated using random numbers. With 122 bits of randomness, the probability of a collision is negligible — you'd need to generate over a billion UUIDs per second for thousands of years to have a 50% chance of a single collision.

UUIDs are used as primary keys in databases, identifiers in distributed systems, file names, session IDs, and anywhere a globally unique label is needed.

FAQ

What is a UUID?

UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify objects. A v4 UUID is randomly generated, making collisions astronomically unlikely.

Are these UUIDs truly random?

Yes. This tool uses the Web Crypto API (crypto.randomUUID) which is cryptographically secure and built into all modern browsers.

What is the format of a UUID?

A UUID follows the format xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx, where x is a random hex digit and y is constrained to 8, 9, a, or b.

How many UUIDs can I generate at once?

Up to 100 at a time using the batch generator.