UUID/GUID Generator

Need unique identifiers for a database, API, software project, or test data? This tool generates random version 4 UUIDs (also known as GUIDs), either individually or in bulk. Whether you're assigning identifiers to records, creating test values for development, or generating unique references for your applications, you can quickly create as many UUIDs as you need in a standard format.

Generate a single UUID or create multiple identifiers at once, ready to copy and use in your projects. Everything is generated directly in your browser, with nothing sent to a server, keeping your data private and under your control.

UUID/GUID Generator

How many

UPPERCASE Hyphens Braces {}

Generated with crypto.randomUUID / crypto.getRandomValues. Nothing you generate is sent anywhere.

How to use it

The UUID generator creates random, version 4 UUIDs.

Choose how manyGenerate 1 to 100 at once.
Set the formatToggle uppercase, hyphens and surrounding braces to match what you need.
GenerateClick Generate to create a fresh batch.
CopyClick any UUID to copy just that one, or use Copy all for the whole list.

Good to know

Nothing is uploaded

UUIDs are generated in your browser using a cryptographically secure random source.

Practically unique

A version 4 UUID has 122 random bits. The chance of two ever colliding is astronomically small.

Not sequential

These UUIDs are fully random, so they don't sort in creation order. If you need that, look for a time-ordered ID scheme such as UUIDv7 or ULID.

Frequently asked questions

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

They're effectively the same thing. GUID (Globally Unique Identifier) is Microsoft's name for what's standardized elsewhere as a UUID (Universally Unique Identifier).

What does 'version 4' mean?

UUIDs come in several versions with different generation methods. Version 4 is generated from random bits rather than, say, a timestamp or a hardware address, which is why it's the most common choice for general-purpose unique IDs.

Can two generated UUIDs ever be the same?

In theory yes, in practice effectively never. With 122 random bits, you'd need to generate billions of UUIDs per second for billions of years before a collision became likely.

Is my generated data sent anywhere?

No. Everything is generated locally in your browser.