UUID Generator

Generate various types of UUIDs (Universally Unique Identifiers) for your applications. Choose from different versions based on your specific needs.

v1MAC + Timestampv4Randomv6Timestamp Reorderedv7DB OptimizedNILEmptyGUIDMicrosoft

GUID (Microsoft Format)

Generate Microsoft-style GUIDs with uppercase letters and braces. Commonly used in Windows applications, .NET framework, and Microsoft technologies.

Bulk Generation

Generate multiple UUIDs at once for batch operations

Or

Only 1 to 10,000 allowed

API Information

Use these endpoints to integrate UUID generation into your applications

GEThttps://fastweb.tools/api/uuid/guid

Generate a single guid UUID

GEThttps://fastweb.tools/api/uuid/guid?count=100

Generate multiple guid UUIDs (max: 10,000)

What is a GUID? Microsoft

GUID (Globally Unique Identifier) is Microsoft's implementation of UUID. It's functionally identical to UUID v4 but uses Microsoft's preferred formatting conventions with uppercase letters and curly braces.

Format Differences:

Standard UUID:f47ac10b-58cc-4372-a567-0e02b2c3d479
Microsoft GUID:{F47AC10B-58CC-4372-A567-0E02B2C3D479}

Technical Identity:

  • Same randomness as UUID v4 (122 random bits)
  • Same uniqueness guarantees
  • Same collision resistance
  • Only formatting differs

When to Use GUID

✅ Perfect For:

  • Microsoft .NET applications
  • Windows-based systems and services
  • COM/ActiveX component development
  • Microsoft SQL Server databases
  • SharePoint and Office integrations
  • Azure and Microsoft Cloud services
  • PowerShell scripting

🔄 Interoperability:

  • Easily convertible to standard UUID format
  • Can be used with non-Microsoft systems
  • Compatible with most programming languages
  • Works with cross-platform applications

Microsoft Ecosystem Integration

.NET Framework

Native Guid type with built-in support for GUID format generation and parsing.

Guid.NewGuid()

SQL Server

UNIQUEIDENTIFIER data type natively supports GUID format with optimal storage.

NEWID()

Registry & COM

Windows Registry and COM components use GUID format for class and interface IDs.

CLSID/IID

Cross-Platform Considerations

While GUIDs are Microsoft-centric, they work perfectly in cross-platform scenarios. The curly braces and uppercase formatting are purely cosmetic - the underlying uniqueness and randomness remain identical to standard UUIDs. Most systems can parse both formats interchangeably.

Performance Notes

GUID generation performance is identical to UUID v4. The formatting overhead (adding braces and converting to uppercase) is minimal. In Microsoft environments, native GUID types often provide better performance than string-based UUID handling.