GUID vs UUID
Compare GUID and UUID naming, formats, versions, and common use cases.
Comparison
GUID and UUID usually refer to the same 128-bit identifier format. UUID is the standards term; GUID is common in Microsoft tools and databases.
GUID
Common in .NET, SQL Server, Windows APIs, and Azure docs.
UUID
Common in RFCs, JavaScript packages, databases, and API docs.
Use UUID v4 for random IDs. Use UUID v7 when new IDs should sort roughly by creation time.
Generate GUIDs Online
The main GUID Generator creates UUID v4 or v7 values with bulk output, validation, uppercase, braces, and compact formatting.
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Frequently asked questions
What is the difference between a GUID and a UUID?
They usually describe the same 128-bit identifier format. GUID is Microsoft terminology, while UUID is the standards-based name.
Do GUIDs and UUIDs use the same format?
They commonly use the same hexadecimal 8-4-4-4-12 layout, with optional braces in some GUID contexts.
When should I use UUID v4?
Use v4 when you want identifiers generated from random data and do not need creation-time ordering.
Can this page check an identifier?
Yes. Paste a GUID or UUID to check its format, version, variant, and normalized value.