ClickWebTools

UUID Generator

Generate random version 4 UUIDs, one at a time or up to 1,000 at once, using your browser’s secure random number generator.

Developer ToolsFreeNo sign-up
Runs in your browser. Nothing you enter is uploaded.

01How to use the UUID Generator

  1. 01Choose how many UUIDs you need.
  2. 02Pick formatting: uppercase, hyphens or braces.
  3. 03Press Generate, then copy or download the list.

02UUID version 4 format

xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx

128 bits, written as 32 hex digits in groups of 8-4-4-4-12.
“4” marks version 4 (random).
“y” is 8, 9, a or b (the RFC 9562 variant).
122 bits are random.

03Examples

f47ac10b-58cc-4372-a567-0e02b2c3d479 is a valid v4 UUID.

Without hyphens: f47ac10b58cc4372a5670e02b2c3d479.

Windows registry style: {F47AC10B-58CC-4372-A567-0E02B2C3D479}.

04Frequently asked questions

Can two generated UUIDs be the same?

In practice, no. With 122 random bits you would need to generate billions per second for many years before a collision became likely.

Are these UUIDs secure?

They come from crypto.randomUUID or crypto.getRandomValues, the browser’s cryptographically secure generator. They are unique identifiers, not passwords or secret tokens.

Are UUIDs sent to a server or logged?

No. They are generated in your browser and never leave it.