UUID / GUID Generator

Create random RFC 4122 version 4 UUIDs for database keys, test data and correlation IDs — one or up to 100 at a time.

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How to use it

  1. Type how many UUIDs you need (1–100) in the input, or leave it empty for one.
  2. Click Generate.
  3. Copy the list — one UUID per line.

Frequently asked questions

Are these UUIDs unique?

Version 4 UUIDs have 122 random bits from a cryptographically secure generator, so a collision is practically impossible.

What's the difference between a UUID and a GUID?

None in practice — GUID is Microsoft's name for the same 128-bit identifier format.

Is it free, and is my data uploaded?

It's free with no sign-up, and it runs entirely in your browser — your input is never sent to our servers.

Free Hash SHA-256 and SHA-1 of the input text (in the browser). Free Unix time Convert unix timestamps and ISO dates. Free Base64 Encode or decode UTF-8 text as Base64.