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UUID Generator

Batch-generate UUID v4 with one-click copy — great for testing and database keys.

Online UUID generator

Need lots of unique identifiers? This UUID v4 generator creates many RFC 4122 universally unique identifiers at once using a cryptographic RNG — ideal for database keys, test data, API request IDs and file names.

How to use

  1. Set how many to generate (1–500).
  2. Tick "Uppercase" if you need uppercase format.
  3. Click Generate, then Copy all to take the results.

Common use cases

  • Primary keys for database records.
  • Coordination-free unique IDs in distributed systems.
  • Test data or unique file names.

Frequently Asked Questions

What is UUID v4?

A UUID is a 128-bit identifier. Version 4 is generated from random numbers with an extremely low collision chance, commonly used as a database key or a unique ID in distributed systems.

Can generated UUIDs collide?

In theory there is a tiny chance, but in practice it is negligible — UUID v4 has 122 random bits, so even billions of them almost never collide.

How are these UUIDs generated?

Using the browser-native crypto.randomUUID() / crypto.getRandomValues() cryptographic RNG, entirely on your device.

Is it the same as a GUID?

Essentially yes. GUID is Microsoft's name for a UUID, with the same format as a standard UUID.

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