UUID Generator Online Free (Random UUID v4)

Test data, database keys, file names, session IDs: sooner or later you need a unique identifier. The PDFFlowState UUID Generator is a free tool that creates random version 4 UUIDs in your browser, with no account.

Open the UUID Generator

What does UUID Generator do?

UUID Generator creates random version 4 UUIDs. If you searched for UUID generator, generate UUID online, UUID4 generator, random UUID or get UUID, this is the tool.

What is a UUID?

A UUID (universally unique identifier) is a 128-bit value written as 32 hexadecimal characters in five groups, for example 123e4567-e89b-42d3-a456-426614174000. Version 4 UUIDs are generated randomly, and the chance of two being the same is extremely small. UUIDs are also called GUIDs in some systems.

How to generate a UUID

1. Open the tool. Go to UUID Generator. It works on phone and desktop.
2. Generate. Create a new random UUID.
3. Copy it into your code, database or test data.

No sign-up is needed, so it is a free online UUID generator.

When is it useful?

• Database primary keys and record IDs.
• Test data and mock APIs.
• Unique file or session names.
• Quickly grabbing an ID without writing code.

Related tools

• Make a fingerprint of text with Hash Generator.
• Format JSON that contains UUIDs with JSON Formatter.
• Match UUID patterns with Regex Tester.

Frequently asked questions

Is the UUID generator free? Yes. It is free and needs no sign-up.

Which UUID version does it create? Version 4 (random).

Are UUIDs really unique? Not mathematically guaranteed, but the chance of a collision with random v4 UUIDs is so small that they are treated as unique in practice.

Is a UUID the same as a GUID? They are essentially the same thing. GUID is the term used in many Microsoft systems.

Can I generate other versions, such as v1 or v7? Not at the moment.

Generate your UUID now

Try the free UUID Generator or browse all the developer tools on PDFFlowState.