A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify information across computer systems without a central authority.

What is the difference between UUID v4 and UUID v7?

UUID v4 is generated entirely from random bits. UUID v7 includes a millisecond-precision timestamp prefix followed by random bits, making it time-ordered and optimal for database primary keys.

Are generated UUIDs guaranteed to be unique?

Yes, practically speaking. The probability of generating a duplicate UUID v4 or v7 is so infinitesimally small that collisions are impossible in real-world applications.

Does this tool store generated UUIDs on a server?

No. All UUIDs are generated locally in your web browser using Web Crypto API (`crypto.randomUUID()`).

Free UUID Generator

100% Client-Side: Your data never leaves your browser. Zero server processing or data storage.

UUID Generator

Choose your UUID version, set options, and generate one or more UUIDs at once. All generation happens locally in your browser.

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Free UUID Generator

UUID Generator

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