UUID Generator

Generate one or many random UUIDs (v4) with cryptographically secure randomness.

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How to use it

  1. Set how many UUIDs you need (1–100) and press Generate.
  2. Optionally enable compact formatting (no hyphens) or uppercase output.
  3. Copy the result with one click. Every UUID is version 4, generated with the Web Crypto API.

About this tool

Produces RFC-compliant version 4 UUIDs using crypto.getRandomValues(), the strongest randomness source available in the browser. Generate single IDs or batches, choose between canonical and compact formatting, and copy the results in one click.

Your input never leaves the browser: this tool works entirely offline once the page has loaded.

Frequently asked questions

Are these UUIDs cryptographically secure?

Yes. Version 4 UUIDs are generated from crypto.getRandomValues(), the browser's strongest randomness source, following RFC 4122.

Can two generated UUIDs collide?

Practically never: v4 has 122 random bits. Generating a duplicate among billions of IDs per year remains astronomically unlikely.