UUID Generator
Generate a random RFC-4122 version 4 UUID with one click.
Create a universally unique identifier (UUID version 4) for database primary keys, API request IDs, test fixtures, file names, or anywhere you need a value that is practically guaranteed never to repeat. Each click generates a fresh 128-bit identifier from your browser’s cryptographically secure random source, so the values are safe to use as real keys, not just throwaway placeholders.
How to use the UUID Generator
- Click Generate UUID to produce a new identifier.
- Copy it with the Copy button.
- Click again as often as you need — each result is independent and unique.
Frequently asked questions
What is a version 4 UUID?
A UUID generated from random numbers. The chance of two ever colliding is astronomically small, which is why they are used as unique IDs.
What does a UUID look like?
Thirty-two hexadecimal digits in five hyphen-separated groups, for example 3f2504e0-4f89-41d3-9a0c-0305e82c3301.
Are version 4 UUIDs safe as database keys?
Yes, they are widely used for exactly that. Note they are not sortable by creation time — if you need that, a time-ordered format like UUID v7 is better.