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UUID Generator

Generate unique UUIDs

About UUID Generator

UUID Generator creates version 4 (random) UUIDs using the Web Crypto API's crypto.getRandomValues() for cryptographically strong randomness, entirely in your browser — nothing is uploaded to a server. It only generates version 4 UUIDs; there's no support for version 1 (timestamp-based), 3, or 5 (namespace-based) formats, and no format options like uppercase or no-hyphen output.

How to use UUID Generator

  1. 1Set how many UUIDs you want (1 to 20) in the Count field.
  2. 2Click 'Generate' to create that many random UUIDs.
  3. 3Click 'Copy' next to any UUID to copy it to your clipboard.
  4. 4Generating again replaces the current list — copy anything you need first.

Frequently Asked Questions

What is a UUID?

A 128-bit identifier designed to be unique across systems without central coordination — commonly used for database keys, request IDs, and API resource identifiers.

Is the UUID Generator free to use?

Yes, completely free with no registration required.

What UUID version does this generate?

Only version 4 (random) UUIDs — versions 1, 3, and 5 aren't supported.

Are these UUIDs safe to use as unguessable tokens?

Yes — they're generated with the Web Crypto API's cryptographically secure random number generator, not Math.random(), so they aren't predictable.

Tips & Tricks

  • ✓Copy each UUID you need right away, since generating a new batch replaces the current list without saving the old one.
  • ✓The maximum is 20 UUIDs per click; click 'Generate' again for more.
  • ✓All UUIDs are version 4 with standard lowercase, hyphenated formatting (8-4-4-4-12 hex digits).
  • ✓If you need UUID v1, v3, or v5, use a library or tool built for that specific version.