A Universally Unique Identifier is a 128-bit value, usually shown as 36 characters with hyphens, used to identify records across systems.

How do I generate a UUID v4?

Tap Generate UUID v4 above. This tool creates version 4 (random) UUIDs in your browser.

What is the difference between UUID versions?

Version 1 uses time and node data, version 4 is random, and later versions add other schemes. Most new APIs prefer v4 unless they need sortable time-based IDs.

Collision risk for UUID v4 is astronomically low in normal use, which is why teams treat them as unique for practical purposes.

Where are UUIDs used?

Database primary keys, REST API resource IDs, idempotency keys, session identifiers, and distributed tracing all commonly use UUIDs.

What is UUID Generator?

A free online tool that creates UUID v4 strings for developers and students.

How does the UUID Generator work?

It calls the browser crypto.randomUUID API (or an equivalent random fill) to produce RFC 4122 v4 identifiers.

How do I use the UUID Generator?

Set a count, generate, and copy the IDs you need. Use chips for 1, 5, or 10 quickly.

Is this UUID Generator free to use?

Yes. It is free with no sign-up.

Can I use the UUID Generator on mobile?

Yes. It works in modern mobile browsers.

Free UUID Generator Online, Create UUID v4 IDs

Free UUID Generator Online, Create UUID v4 IDs | Binary Tech