UUID Generator

Generate unique UUIDs and GUIDs in bulk

Built & maintained by Pappu Venkata Subbi Reddy, founder of Clacify

About UUID Generator

Clacify's UUID Generator creates Version 4 (random) UUIDs — universally unique identifiers in the standard xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx format. Generate one or hundreds at once using your browser's cryptographically random number generator. UUIDs are used as primary keys in databases, unique IDs in distributed systems, request tracking in APIs, and anywhere a globally unique identifier is needed without a central authority.

Frequently Asked Questions

What is a UUID and how is it used?

A UUID (Universally Unique Identifier) is a 128-bit identifier formatted as 8-4-4-4-12 hexadecimal characters (e.g. 550e8400-e29b-41d4-a716-446655440000). UUIDs are used as primary keys in databases instead of sequential integers to avoid collisions in distributed systems, as request IDs in microservices, and as file names for uploaded assets.

What is the difference between UUID and GUID?

UUID and GUID (Globally Unique Identifier) refer to the same thing — a 128-bit unique identifier. UUID is the formal IETF standard (RFC 4122); GUID is Microsoft's term for the same concept used in Windows and .NET. They are interchangeable and use the same format.

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