UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify information in computer systems. Version 4 UUIDs are randomly generated, making collisions astronomically unlikely.

Is UUID v4 truly unique?

Practically yes. There are 2^122 possible v4 UUIDs — about 5.3 undecillion. The probability of generating a duplicate is negligibly small even at massive scale.

What's the difference between UUID and GUID?

They're the same thing. GUID (Globally Unique Identifier) is Microsoft's name for the same standard.

Can I use these UUIDs in a database?

Yes. UUID v4 is a common choice for primary keys in databases, especially when you need IDs generated client-side or across distributed systems.

UUID Generator

Generate random UUID v4 strings instantly. Copy single or bulk UUIDs for use in code or databases.

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Frequently asked questions

UUID Generator — Generate Random UUID v4 Online Free

Generate one or many UUID v4 strings instantly. UUIDs are used as unique identifiers in databases, APIs, distributed systems, and anywhere you need a globally unique ID without a central authority. All generation happens in your browser using the Web Crypto API.

Cryptographically random

Uses the browser's Web Crypto API (crypto.randomUUID) for high-quality randomness.

Bulk generation

Generate 1 to 100 UUIDs at once. Copy all with one click.

No server

Runs entirely in your browser — nothing is sent anywhere.

Need a quick UUID for a database record, API test, or code stub? Generate one in a click.