UUID Generator

Generate random UUID v4 values instantly for testing, development, databases, APIs, and sample data.

Quantity

Generated UUIDs

Results will appear here after you generate them.

What is a UUID?

A UUID is a universally unique identifier used to label records, requests, objects, files, sessions, and other values without relying on a central counter. UUIDs are commonly represented in a standard hyphenated format.

What can you use UUIDs for?

Databases

Create sample primary keys, foreign keys, and record identifiers.

APIs

Generate request IDs, resource IDs, and payload examples.

Testing

Populate fixtures, unit tests, demos, and mock data.

Development

Create throwaway identifiers for local builds and documentation.

UUID v4 examples

UUID v4 values use the familiar 8-4-4-4-12 hexadecimal format. They are useful when you need realistic identifier-shaped values for tests, fixtures, and API examples.

Is this UUID generator secure?

This tool uses crypto.randomUUID() when available and falls back to browser cryptographic randomness for UUID v4 generation. Results are generated client-side in your browser and are not created during the initial server render.

How to use

1
Choose quantity
Select 1, 5, 10, 25, or 50 UUIDs.
2
Generate UUIDs
Click Generate UUID to create fresh UUID v4 values.
3
Review results
Generated UUIDs appear in a responsive results list.
4
Copy output
Use Copy to copy all current UUIDs at once.

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Frequently Asked Questions

What is a UUID?

A UUID is a universally unique identifier, a 128-bit value commonly shown as 32 hexadecimal characters separated by hyphens.

What is UUID v4?

UUID v4 is the random UUID version. It uses random bits plus fixed version and variant bits to create identifiers that are highly unlikely to collide.

Are UUIDs unique?

UUIDs are designed to be practically unique. A random UUID v4 collision is extremely unlikely when generated with strong randomness.

Can I use these UUIDs in databases?

Yes. UUIDs are commonly used as database identifiers, API IDs, event IDs, and sample records.

Is this UUID generator free?

Yes. This UUID generator is free to use online.