UUID Generator
Generate unique IDs for apps, databases, APIs, and test data with support for UUID v1 style and v4 random identifiers, bulk output, no-hyphen mode, copy actions, and local history.
Generate one or many UUIDs at once, then copy the first result or the full batch for APIs, databases, test fixtures, and backend workflows.
36
1
Random IDs
v4
How to Use the UUID Generator
- Select whether you want UUID v1 style or UUID v4 random identifiers.
- Choose how many UUIDs you want to generate in the batch.
- Turn off hyphens if you need a compact no-separator format for specific systems.
- Generate the IDs, then copy the first one or the full batch for your project.
What Is a UUID?
A UUID is a universally unique identifier used to label records, sessions, keys, transactions, and resources in software systems without relying on a central numbering service.
UUID v1 vs v4
UUID v1 style identifiers include a time-based component, while UUID v4 values are random. In practice, v4 is often the default choice because it is simple and widely supported across stacks and libraries.
Why UUIDs are used
UUIDs help avoid collisions when many systems create IDs independently. They are useful in distributed systems, API payloads, database keys, imports, test fixtures, and background jobs.
Use cases in databases and APIs
Developers use UUIDs as primary keys, public resource IDs, webhook event references, cache keys, and request or correlation IDs when uniqueness matters across environments and services.
Frequently Asked Questions
What is UUID?
A unique identifier used in software systems.
Is this tool free?
Yes.
Can I generate multiple UUIDs?
Yes.
Which version should I use?
v4 is most common.