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GUID Generator

Create new GUIDs in the format Windows, .NET and SQL Server tools expect, one at a time or a thousand at once.

Uppercase No hyphens Braces urn:uuid: prefix Output Namespace Name

Generated UUIDs

Inspect a UUID

How to Use

A GUID in registry format, {UPPERCASE-WITH-BRACES}, is generated when the page opens.
Untick Braces or Uppercase for the plain .NET ToString() form.
Set the count for bulk GUIDs and choose lines, JSON, CSV or SQL output.
Copy the result or download it as a file.

Frequently Asked Questions

What is the difference between a GUID and a UUID?

None in substance. GUID (globally unique identifier) is the name Microsoft uses; UUID is the name in the RFC standard. Both are 128-bit values written as 32 hex digits in five groups.

Which GUID format should I use?

Registry files and COM class IDs use {UPPERCASE} with braces. .NET's Guid.ToString() produces lowercase without braces. SQL Server accepts both.

Are these GUIDs unique?

They are random version 4 values from a cryptographically secure generator. The chance of generating the same one twice is negligible for any real workload.

What about sequential GUIDs for SQL Server?

SQL Server's NEWSEQUENTIALID() orders values for its own index layout. For a portable time-ordered identifier, use UUID v7 instead.

Generate GUIDs Online

Updated September 24, 2026 · By Saman

If you work with Windows, .NET, COM, the registry or SQL Server, you call them GUIDs; everyone else says UUIDs. They are the same 128-bit identifiers, and the only differences you will meet in practice are formatting conventions: uppercase or lowercase, with or without braces.

This page opens the UUID Generator with random version 4, uppercase and braces switched on, which is the classic registry style.

GUID formats at a glance

Format	Example	Where you see it
Registry (B, upper)	`{F47AC10B-58CC-4372-A567-0E02B2C3D479}`	Registry, COM CLSIDs, Visual Studio project files
.NET default (D)	`f47ac10b-58cc-4372-a567-0e02b2c3d479`	`Guid.ToString()`, JSON APIs
No hyphens (N)	`f47ac10b58cc4372a5670e02b2c3d479`	Compact keys, file names
URN	`urn:uuid:f47ac10b-58cc-4372-a567-0e02b2c3d479`	XML and standards documents

Every one of these is available with the checkboxes above the output, and they can be combined with bulk generation.

Creating GUIDs in Microsoft tools

C#: Guid.NewGuid(), formatted with .ToString("B").ToUpperInvariant() for registry style.
PowerShell: [guid]::NewGuid() or New-Guid.
SQL Server: NEWID() for random values, NEWSEQUENTIALID() as a column default.
Visual Studio: Tools, Create GUID.

Bulk GUIDs for test data

Seeding a database or writing fixtures often needs dozens of identifiers. Set the count, choose SQL output to get a ready VALUES list, or JSON for an array you can paste into a test. Nothing is sent to a server, so generating GUIDs for internal systems leaks nothing.

Related generators

Lowercase and without braces is simply a UUID v4. For identifiers that sort by creation time, use UUID v7, which .NET 9 also supports through Guid.CreateVersion7().

Guides

UUID vs GUID: What Is Actually Different GUID is Microsoft's name for a UUID. The differences you meet in practice are text formatting, byte order when the value is stored as 16 bytes, and SQL Server's sort order.