UUID generator

Generate a version 4 universally unique identifier.

  • Development
  • 100% free
  • No sign-up
  • Runs in your browser
UUID generator
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What is the uuid generator?

The UUID generator creates version 4 universally unique identifiers, 128-bit values written as 36 characters, for example 3f2b8c4e-9d1a-4f6b-8e2c-7a5d1b9c0e4f. A new UUID is generated each time you open the page or press Regenerate.

UUIDs are used as database keys, API identifiers, file names and tracking IDs, because they can be created anywhere without coordination and practically never collide.

How to use the uuid generator

  1. 1A UUID is generated when the page opens.
  2. 2Press Regenerate to create a new one.
  3. 3Copy the UUID with one click.

Features

Version 4

Random UUIDs compliant with RFC 4122.

Secure randomness

Created with the Web Crypto API.

Instant

Generated in your browser, no request needed.

One click copy

Copy it straight to your clipboard.

Frequently asked questions

Can two UUIDs be the same?

In theory yes, in practice no: you would need to generate billions per second for many years to have a real chance of a collision.

What is the difference between a UUID and a GUID?

They're the same thing. GUID is the name used by Microsoft.

Are UUIDs good primary keys?

They work well in distributed systems. For very large tables, time ordered UUIDs (v7) index better.

Is the UUID stored?

No, it's generated in your browser only.