Free developer utility

UUID Generator

Generate one or up to 100 random version 4 UUIDs in your browser. Copy identifiers for API examples, test fixtures, and database records without signing in.

How to generate a UUID

Choose a quantity between 1 and 100, select Generate UUIDs, and copy the results. Each identifier appears on its own line. Generate another batch whenever you need fresh values.

What is a version 4 UUID?

A UUID is a 128-bit identifier commonly written as 32 hexadecimal digits separated by hyphens. Version 4 uses random values, with designated bits for the version and variant. These IDs are useful for test records, request examples, and distributed applications.

How are these UUIDs created?

This tool uses your browser’s crypto.randomUUID API. Generation happens on your device; generated identifiers are not included in analytics events or sent to our server. HTTPS and a browser supporting this API are required.

Are UUIDs guaranteed to be unique?

Random UUID collisions are extremely unlikely, but uniqueness is not an absolute guarantee. Use a unique database constraint when duplicate identifiers would cause problems. UUIDs identify records; they do not replace authorization checks.

Can I use these in JSON?

Yes. Put the UUID inside a quoted JSON string, such as an id field. Use the JSON Formatter to check the complete payload, or the REST API Tester to try a request.