UUID Generator

Generate version 4 UUIDs (also called GUIDs) — universally unique identifiers — instantly and for free. Create a single ID or a whole batch, using your browser's cryptographic randomness.

What is a UUID?

A UUID (Universally Unique Identifier), sometimes called a GUID, is a 128-bit value written as 32 hexadecimal digits in the pattern 8-4-4-4-12, e.g. 3f2504e0-4f89-41d3-9a0c-0305e82c3301. Version 4 UUIDs are generated from random numbers, making collisions astronomically unlikely — perfect for database keys, file names, and request IDs.

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Frequently asked questions

Are these UUIDs truly unique?

Version 4 UUIDs use 122 random bits, so the chance of two colliding is negligible for any realistic use. They're generated with the Web Crypto API for strong randomness.

What's the difference between UUID and GUID?

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

Is anything sent to a server?

No. UUIDs are generated entirely in your browser; nothing is uploaded.