What is UUID Generator?
A UUID (Universally Unique Identifier) is a 128-bit value used to uniquely label data without a central authority. This generator creates random version 4 UUIDs — the most common type — following the RFC 4122 standard. Each one looks like 3f2504e0-4f89-41d3-9a0c-0305e82c3301 and is, for all practical purposes, guaranteed to be unique.
You can generate a single UUID or hundreds at once, in lowercase or uppercase, ready to paste into databases, code or configuration.
How to Use the UUID Generator
- Enter how many UUIDs you need.
- Choose lowercase or uppercase output.
- Click Generate UUIDs.
- Copy the whole list to use in your project.
Features of Our UUID Generator
- Standards-compliant version 4 UUIDs
- Bulk generation of up to 500 at once
- Uppercase or lowercase output
- Uses secure random values
- One-click copy of the entire list
- Generated locally with complete privacy
Benefits & Use Cases
Developers use UUIDs as primary keys, correlation IDs and unique file names because they can be created independently on any machine without collisions. Bulk generation is handy for seeding databases and testing.
Since generation happens in your browser using secure randomness, the identifiers are created instantly and never exposed to any server.
Generating things on demand saves time and sparks ideas. The UUID Generator produces fresh results in an instant, as many times as you like, so you are never stuck waiting or hunting for a starting point. Grouped with our other generators, it becomes part of a wider toolkit for quickly creating the passwords, codes, colours and data that modern projects rely on.
Best of all, our UUID Generator runs entirely inside your web browser. Nothing you enter is uploaded or stored on a server, so your data stays private and results appear instantly. It is completely free, requires no sign-up or installation, and it works beautifully on desktop, tablet and mobile alike. The interface supports both light and dark themes and is built with accessibility in mind, so it is comfortable to use for everyone. Bookmark this page and come back to the UUID Generator as often as you need — it will always be here, ready and free to use.
Tips for Getting the Best Results
To get the most from the UUID Generator, adjust the available options until the output matches exactly what your project needs — a few seconds of configuration up front saves you from reworking the result later. Because you can generate again and again at no cost, do not settle for the first output if it is not quite right; simply regenerate until you get something you are happy with.
When you produce something important, remember to copy or download it before leaving the page, since the UUID Generator does not store your results anywhere. This is a deliberate privacy choice: nothing you create is kept on a server. If you need a record, save it to your own device or paste it straight into the document, database or project where it belongs.
FAQ about UUID Generator
What is a version 4 UUID?
A version 4 UUID is generated from random numbers, with specific bits set to mark it as v4. It is the most widely used type for general identifiers.
Are the UUIDs really unique?
The probability of a collision is astronomically small, so for practical purposes each generated UUID can be treated as globally unique.
Can I generate many at once?
Yes. You can create up to 500 UUIDs in a single click and copy the whole list, which is ideal for seeding data.
Is this secure and private?
Yes. UUIDs are built with the browser's secure random generator and never leave your device.