.NET GUID Generator
LiveGenerate GUIDs online in .NET, C#, and multiple formats instantly.
Understanding .NET GUIDs
GUIDs (Globally Unique Identifiers) are Microsoft's implementation of the UUID standard, used extensively in .NET applications for database primary keys, entity identifiers, COM class registration, assembly identification, and distributed system correlation. .NET's System.Guid type represents a 128-bit value formatted as 32 hexadecimal digits in groups: {D4E8A6B3-2F1C-4A9D-B5E7-3C8F1D2A9B4E}. Unlike UUIDs which typically omit braces, .NET GUIDs conventionally include braces and uppercase letters, especially in contexts like SQL Server uniqueidentifier columns and Windows registry entries.
Use this free online GUID generator to create new GUIDs (Globally Unique Identifiers) instantly. Generate GUIDs in standard .NET formats including Registry format, Guid.NewGuid() for C#, uppercase, lowercase, braces, parentheses, and hex array representations. Generate single or bulk GUIDs for database keys, unique identifiers, and .NET/C# application development.
The Devkitr .NET GUID Generator creates GUIDs in standard .NET formats — with braces, without braces, uppercase, lowercase, and different format specifiers (N, D, B, P, X). Generate single or bulk GUIDs for database seeding, entity identification, and .NET development.
In a typical development workflow, .NET GUID Generator becomes valuable whenever you need to generate guids online in. Whether you are working on a personal side project, maintaining production applications for a company, or collaborating with a distributed team across time zones, having a reliable browser-based generation tool eliminates the need to install desktop software, write one-off scripts, or send data to third-party services that may log or retain your information. Since .NET GUID Generator processes everything locally on your device, your data stays private and your workflow stays uninterrupted — open a browser tab, paste your input, get your result.
Key Features
Multiple .NET Formats
Generate GUIDs in all standard .NET format specifier outputs: N (no hyphens), D (hyphens), B (braces), P (parentheses), X (hexadecimal structure).
Bulk Generation
Create up to 1000 GUIDs at once for database seeding scripts, test data generation, and batch identifier creation.
SQL Server Compatible
Outputs in UNIQUEIDENTIFIER format ready for SQL Server INSERT statements, Entity Framework seed data, and stored procedures.
C# Code Snippets
Generates ready-to-paste C# constant declarations: public static readonly Guid MyId = new Guid("...");
How to Use .NET GUID Generator
Select Format
Choose the GUID format — braces for .NET conventions, no braces for cross-platform use, N format for compact representation.
Set Quantity
Choose how many GUIDs to generate — one for quick use or bulk for database seeding and test data.
Generate
Create cryptographically random GUIDs instantly. Each generation produces completely new unique identifiers.
Copy in Desired Format
Copy as raw GUIDs, C# declarations, SQL values, or a newline-separated list for your specific use case.
Use Cases
Entity Framework Seed Data
Generate GUIDs for ModelBuilder seed data in EF Core migrations, ensuring consistent identifiers across migration runs.
SQL Server Primary Keys
Create UNIQUEIDENTIFIER values for SQL Server INSERT scripts, stored procedures, and database migration seed data.
.NET Configuration Constants
Generate GUIDs for assembly attributes, COM interop class IDs, and application-level unique identifiers defined as constants.
API Resource Identifiers
Create GUIDs for .NET API resources, ensuring unique identifiers for entities before database insertion.
Pro Tips
Use Guid.NewGuid() in production code for runtime generation. This tool is for generating constants, seed data, and identifiers needed at development time.
For better database indexing performance, consider sequential GUIDs (Guid.CreateVersion7() in .NET 9+) instead of random v4 GUIDs.
Store GUIDs as uniqueidentifier in SQL Server (16 bytes) not varchar(36) (36 bytes) for efficient storage and indexing.
Use the "N" format (no hyphens, no braces) when GUIDs are used in file names or URL paths to avoid special character issues.
Common Pitfalls
Using random GUIDs as clustered primary keys in SQL Server
Fix: Random GUIDs cause index fragmentation. Use NEWSEQUENTIALID() in SQL Server or sequential GUID generation for clustered indexes.
Parsing GUIDs without handling format differences
Fix: Use Guid.Parse() or Guid.TryParse() which accept multiple formats. Don't assume all GUID strings include braces or hyphens.
Comparing GUID strings instead of Guid objects
Fix: String comparison is case-sensitive and format-dependent. Always compare using Guid.Equals() or == operator on Guid types.
Frequently Asked Questions
QHow do I generate a new GUID?
Click Generate to create a new GUID instantly. Choose from multiple formats including standard, braces, C# Guid.NewGuid(), uppercase, and lowercase.
QCan I generate GUIDs for C# and .NET?
Yes. The GUID generator outputs C# code format (Guid.NewGuid()), .NET Registry format, and other formats used in .NET application development.
QAre the generated GUIDs truly unique?
Yes. GUIDs are generated using cryptographically random values, making collisions practically impossible — safe for database keys and identifiers.
QCan I generate multiple GUIDs at once?
Yes. Use bulk generation to create up to 100 GUIDs at once in your chosen format.
QWhat GUID formats are available?
Standard (d), Braces (B), Parentheses (P), Hex array (X), C# code, uppercase, and lowercase formats.
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