Developer Tool

UUID / GUID generator

Generate random version-4 UUIDs in bulk with formatting options — created with your browser's secure crypto API, nothing uploaded.

Options

UUIDs

All tools

Generate version-4 UUIDs (GUIDs)

Create random version-4 UUIDs — also called GUIDs — one at a time or in bulk, with options for case, hyphens, and braces. Generation uses your browser's cryptographically secure random API, and nothing is uploaded.

Options

  • Generate 1–500 at once.
  • Uppercase, remove hyphens, or wrap in { } braces (Microsoft GUID style).
  • Copy the whole batch with one click.

Useful workflows

  • Seed database primary keys, test fixtures, and correlation IDs.
  • Create unique keys for config and API objects, then validate them with the regex tester.
  • Generate identifiers for JSON payloads you build with the JSON tool.

Frequently asked questions

Are these UUIDs random and secure?

Yes. They are version 4 (random) UUIDs generated with the Web Crypto API (crypto.randomUUID or getRandomValues), not a weak Math.random() source.

Is anything sent to a server?

No. UUIDs are generated entirely in your browser.

What's the difference between UUID and GUID?

They're the same 128-bit identifier; "GUID" is Microsoft's term, often written in uppercase and wrapped in braces.