Toolest

UUID Generator

Generate UUID v4 identifiers locally in the browser.

01 / Fast steps

  1. Choose how many UUIDs you need.
  2. Run the generator.
  3. Copy the identifiers or download them as a list.

02 / Best for

  • Generate primary keys and correlation IDs for development.
  • Fill test fixtures and seed data with unique identifiers.
  • Create one-off tokens for prototypes and scripts.

03 / Why here

  • Batch generation: get dozens of UUIDs in one run instead of one at a time.
  • Generated locally with cryptographic randomness, nothing is fetched or logged.

04 / Keep in mind

  • Generates random v4 UUIDs; time-ordered variants such as v7 are not produced.

Tool connections

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Good to know

Questions & answers

01

Can two generated UUIDs collide?

A v4 UUID has 122 random bits: the chance of a collision is so small that it is treated as impossible in practice, even across billions of IDs.

02

Are the UUIDs generated on a server?

No. They are generated locally in your browser with the Web Crypto API, so they are never transmitted, stored or reused.

03

Is UUID Generator free to use?

Yes, UUID Generator is completely free, with no sign-up and no usage limits. It runs entirely in your browser, so your data never leaves your device.