Free generator

UUID Generator

A UUID is a 128 bit identifier written as 32 hexadecimal digits in five groups. This tool creates random version 4 UUIDs in bulk.

By iToolsLab Editorial TeamUpdated 14 October 2026How we build tools

What is uuid generator?

UUIDs identify records, files and sessions without a central counter. The chance of two random UUIDs matching is so small that systems treat them as unique.

Developers use them as database keys, API request IDs and test data.

How to use the uuid generator

  1. Choose how many you need, up to 100.
  2. Press Calculate.
  3. Copy the list.

How the uuid generator works

Version 4 UUIDs are generated from random bits, with fixed bits marking the version and variant. The tool uses crypto.randomUUID when your browser supports it.

Worked example

A UUID looks like 3b241101-e2bb-4255-8caf-4136c566a962.

Common uses of the uuid generator

  • Creating primary keys for database rows.
  • Labelling uploads, sessions and requests.
  • Generating unique file names.
  • Seeding test data for APIs.
  • Tracking events across systems.

Tips and common mistakes

Store UUIDs in a native UUID or binary column for speed when your database supports it.

UUIDs are not secrets. Do not use them as passwords.

Background: what to know before you rely on it

A universally unique identifier is 128 bits long, shown as 32 hex digits in five groups. Version 4 uses random numbers for almost all bits. The number of possible values is so large that the chance of two matching is negligible, which lets many machines create IDs without talking to each other. Newer versions such as UUID v7 add a timestamp so IDs sort by creation time, which is friendlier to database indexes. UUIDs are identifiers, not secrets, so do not use them as passwords or access tokens unless they come from a secure source and are long enough for the job.

Private, free and fast

This tool runs entirely in your browser. What you type or choose is not uploaded to a server and is not saved after you close the page, which keeps it fast and private. It is free to use as often as you like. See more in all name and id generators, or browse the full list of tools.

Frequently asked questions

What is a UUID?

A universally unique identifier.

What does version 4 mean?

It is built from random numbers.

Can two UUIDs collide?

In practice no.

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