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UUID Generator

Generate random version-4 UUIDs (GUIDs).

Generated locally with a secure random generator.

5

Understanding your result

The chance of a collision between random v4 UUIDs is astronomically small, so they are safe as unique identifiers.

Formula and method

Version-4 UUIDs are 122 random bits formatted as 8-4-4-4-12 hex digits, with the version and variant bits fixed per the standard.

Worked example

A generated UUID looks like 3f2504e0-4f89-41d3-9a0c-0305e82c3301.

How to use this tool

  1. Choose how many to generate.
  2. Press Generate, then copy the list.

Common mistakes to avoid

  • Relying on UUIDs for ordering — they are not sequential.

About the UUID Generator

Generate random version-4 UUIDs (also called GUIDs) for databases, APIs and testing.

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Frequently asked questions

Are these cryptographically random?

Yes. They use the browser’s secure random generator where available.