GUID Generator
GUID GeneratorGenerator
Format Examples
550e8400-e29b-41d4-a716-446655440000{550e8400-e29b-41d4-a716-446655440000}550e8400e29b41d4a716446655440000{550e8400e29b41d4a716446655440000}GUID Validator
About GUIDs
A GUID (Globally Unique Identifier) is a 128-bit identifier commonly used in Windows and Microsoft technologies. GUIDs and UUIDs are functionally identical - GUID is the Microsoft terminology.
GUIDs are commonly used in .NET applications, COM components, Windows Registry, and database primary keys.
Related Tools
What is a GUID?
A GUID (Globally Unique Identifier) is Microsoft's implementation of the UUID standard. GUIDs are 128-bit identifiers commonly used in Windows, .NET Framework, COM components, and database systems.
GUIDs are functionally identical to UUIDs. The main difference is terminology - GUID is the term used in Microsoft ecosystems, while UUID is the more universal standard term defined in RFC 4122.
In .NET, you can generate GUIDs using Guid.NewGuid(). This tool provides a convenient way to generate GUIDs without writing code.
Common Use Cases
.NET Development
Primary keys in Entity Framework, unique identifiers for objects, and correlation IDs for logging.
Windows Registry
COM class identifiers (CLSID), interface identifiers (IID), and application GUIDs.
SQL Server
UNIQUEIDENTIFIER columns for primary keys and foreign keys in database tables.
Distributed Systems
Session identifiers, transaction IDs, and message correlation in microservices.
Frequently Asked Questions
What's the difference between GUID and UUID?
GUID and UUID are the same thing - both are 128-bit unique identifiers. GUID is Microsoft's term while UUID is the universal standard term. They follow the same format and can be used interchangeably.
When should I use the braces format?
The braces format {...} is commonly used in Windows Registry entries, COM programming, and certain Microsoft configuration files. Standard format without braces is more common in databases and general programming.
Should GUIDs be uppercase or lowercase?
GUIDs are case-insensitive, so both are valid. Microsoft traditionally uses uppercase in Windows and .NET, while lowercase is common in web development and databases. Choose based on your project's conventions.
How do I use generated GUIDs in C#?
You can parse the generated GUID using Guid.Parse("your-guid-here") or new Guid("your-guid-here") in C#. Both methods accept GUIDs with or without braces.