UUID Generator

UUID Generator is a free, no-sign-up tool that creates universally unique identifiers you can use to label records in a database or application. Click generate and the tool instantly produces a random, 128-bit UUID formatted the standard way, ready to copy into your code or schema. Developers building databases, APIs, and distributed systems use it whenever they need an identifier that won't collide with another one.

What is UUID Generator?

A UUID is a 128-bit value, usually written as 32 hexadecimal characters split into five groups by hyphens, designed to be unique without needing a central authority to hand them out. This tool generates version 4 UUIDs, meaning the bits are filled using random or pseudo-random values rather than being derived from a timestamp or hardware address. Because the space of possible UUIDs is so large, two randomly generated ones colliding is practically negligible, which is why they're trusted as primary keys and object identifiers across countless systems.

How to use UUID Generator

1. Open the tool and click generate to create a new UUID.
2. Generate additional UUIDs if you need more than one.
3. Copy the UUID and paste it into your code, database, or config.

Key features

• Generates standard-format version 4 UUIDs instantly.
• Lets you create multiple UUIDs in one session.
• Produces output ready to copy directly into your project.
• Completely free with no account needed.

Related tools

Turn a UUID into a scannable code with the QR Code Generator, inspect a related API link with the URL Parser, or generate test data with the Credit Card Generator.

Frequently asked questions

Is UUID Generator free?

Yes, generating UUIDs is free and doesn't require an account. You can generate as many as your project needs.

Are two UUIDs ever the same?

In theory duplicates are possible, but with 128 bits of mostly random data the odds are so astronomically small that version 4 UUIDs are treated as unique in practice across virtually every real-world system. This is why they're commonly used as primary keys without needing to check a central registry first.

What's the difference between UUID versions?

Different UUID versions build the identifier differently, for example version 1 incorporates a timestamp and network identifier while version 4 relies on random values. This tool generates version 4 UUIDs specifically, which is the most common choice when you just need a unique, non-sequential identifier.

Can I use a UUID as a database primary key?

Yes, UUIDs are widely used as primary keys, especially in distributed systems where multiple services might insert records without coordinating on the next sequential number. Keep in mind that UUIDs take up more storage space than a simple auto-incrementing integer, which is a tradeoff worth considering for very large tables.