UUID Generator

Generate universally unique identifiers — random version 4 or time-ordered version 7 — individually or in bulk.

What is the UUID Generator?

A UUID is a 128-bit identifier that is practically guaranteed to be unique without a central authority. v4 is fully random; v7 starts with a timestamp so IDs sort by creation time, which suits database keys.

How does it work?

Random bits come from the browser’s cryptographically secure generator. Version and variant bits are set as defined in RFC 9562.

Example

3f2b8c1e-9a4d-4f7b-8c2e-5d1a6b9e0f13 is a v4 UUID (the 4 marks the version).

Frequently asked questions

Is my data sent to a server?

No. This tool runs entirely in your browser; nothing you paste is uploaded or stored.

Can two UUIDs collide?

The chance for v4 is so small (122 random bits) that it can be ignored for practical purposes.

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