Which version is generated?

Version 4 — built from random numbers. It's the most common choice for general use.

Can two UUIDs collide?

The chance of a collision is so small that it's ignored in practice. That's why UUID v4 values are treated as unique without checking.

Why remove hyphens or change the case?

Some systems and storage formats require UUIDs without hyphens or in uppercase. The options let you get the exact form you need.

Is the generation secure?

Yes, the identifiers are created right in your browser with a cryptographic generator and are never sent anywhere.

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

In practice, none — GUID is Microsoft's name for the same 128-bit identifier, and the format is identical.

How many UUIDs can I generate at once?

Up to 100 per click — set the count and copy the whole list in one go.

UUID generator

UUID generator online (also called GUID): create a version 4 unique identifier, several at once, in uppercase or without hyphens.

Your UUID appears here

How many UUIDs

How to use it

1

Set the count

How many identifiers to generate at once — from one to a hundred.

2

Adjust the format

Optionally switch to uppercase or remove the hyphens.

3

Copy the result

Click “Copy” — the list of identifiers goes to your clipboard.

Why it's useful

A UUID is a 128-bit identifier that is practically guaranteed to be unique without a central counter. Developers use it as a database key, a file name, a session or object ID — anywhere collisions must be avoided.

Version 4 is built from random numbers, so getting two identical UUIDs is virtually impossible. This generator creates them in your browser with a cryptographic source and lets you adjust the format to fit your code or system.

FAQ

A UUID (Universally Unique Identifier) is a 128-bit identifier written as 32 hexadecimal characters. It's used to reliably tell objects apart without a shared counter.

Related tools

Password generator

URL QR code

Wi-Fi QR code