UUID Generator

Frequently asked questions

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify information in computer systems. In its canonical form it looks like 550e8400-e29b-41d4-a716-446655440000. The probability of generating two identical UUIDs is astronomically low.

What is UUID version 4?

UUID v4 is randomly generated using 122 bits of randomness. It is the most widely used version and is suitable for most applications. This tool generates v4 UUIDs using your browser's cryptographic random number generator.

Are the UUIDs generated here truly unique?

Yes. Generation uses the browser's crypto.randomUUID() API, which is cryptographically secure. The theoretical chance of two v4 UUIDs colliding is so small it is considered negligible in practice.

Can I use UUID v4 as a database primary key?

Yes, and it is a common pattern. The main tradeoff is that random UUIDs do not sort chronologically, which can affect index performance in some databases compared to sequential IDs.

Are generated UUIDs stored or logged anywhere?

No. Generation happens entirely in your browser. No UUID is ever sent to a server.