Purpose: Generate cryptographically random version-4 UUIDs (GUIDs) - one or many at once - for databases, keys and APIs.
UUID Generator
The UUID Generator creates random version-4 UUIDs (GUIDs) - universally unique identifiers - singly or in bulk, ready to copy for databases, keys, and APIs.
What a UUID is
A UUID is a 128-bit identifier written as 32 hex digits in five groups, like 3f2504e0-4f89-41d3-9a0c-0305e82c3301. Version 4 UUIDs are generated from random numbers, making collisions astronomically unlikely - which is why they are used as primary keys, session ids, and file names without needing a central authority to hand them out.
Generate as many as you need
Produce a single UUID or a whole batch at once, then copy them with one click. The values are generated using strong browser randomness, entirely on your device. For human-friendly random passwords instead, use the Password Generator.
Frequently Asked Questions
What is a version-4 UUID?
A 128-bit identifier generated from random numbers, formatted as 32 hexadecimal digits in five hyphen-separated groups.
Can two UUIDs ever collide?
In theory yes, but the probability is so astronomically small that version-4 UUIDs are treated as effectively unique in practice.
Can I generate many at once?
Yes. You can produce a batch of UUIDs in one go and copy them together.
Are they generated securely?
They use your browser's random number generator and are created locally, so nothing is sent to a server.
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