Online GUID / UUID Generator

Free Online GUID / UUID Generator

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Use these GUIDs at your own risk! No guarantee of their uniqueness or suitability is given or implied.

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What is a GUID?

GUID (aka UUID) is an acronym for 'Globally Unique Identifier' (or 'Universally Unique Identifier'). It is a 128-bit integer number used to identify resources. The term GUID is generally used by developers working with Microsoft technologies, while UUID is used commonly used elsewhere.

How are GUIDs used?

GUIDs are used by enterprise software developers, progammers, engineers, database administrators, and testers in systems and application development and testing. They are used in Java, C#, Python, C++ , SQL databases, and non-relational Cloud databases as primary keys, versions, component identifiers, or just about anywhere else a truly unique identifier is required. 

How unique is a GUID?

128-bits is big enough and the generation algorithm is unique enough that if 1,000,000,000 GUIDs per second were generated for 1 year the probability of a duplicate would be only 50%. Or if every human on Earth generated 600,000,000 GUIDs there would only be a 50% probability of a duplicate.

More Information About GUIDs

Globally Unique Identifier - Wikipedia, the free encyclopedia
GUID Structure - Microsoft.com
RFC 4122



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