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KioTools
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UUID / GUID Generator

What is this tool?

A UUID generator that runs entirely in your browser. It calls the built-in crypto.randomUUID() API, so every identifier is a proper RFC 4122 version-4 UUID with 122 bits of randomness — nothing is fetched from a server.

When to use it

  • Creating primary keys or record ids for a database or API
  • Generating unique test fixtures or seed data
  • Producing correlation ids for logging and tracing
  • Naming files or resources that must not collide
  • Filling in an id field while prototyping without wiring up a backend

How to use it

  1. 1Set how many UUIDs you need
  2. 2Toggle uppercase, braces or no-hyphens if your target format needs it
  3. 3Click Generate — a fresh batch appears instantly
  4. 4Click any single UUID to copy it, or use Copy all for the whole list
  5. 5Generate again for a completely new set

Frequently asked questions

What version of UUID does this produce?

Version 4 — the fully random variant. It uses crypto.getRandomValues under the hood via the browser's crypto.randomUUID().

Are the UUIDs truly unique?

Version-4 UUIDs have 122 random bits, so the chance of a collision is negligible for any realistic number of ids.

Do the generated UUIDs leave my device?

No — generation is entirely local. Nothing is sent to or logged by any server.

Can I generate them in bulk?

Yes — up to 500 at a time, and you can copy the whole batch as newline-separated text.