Skip to main content
Utilnivo

Developer

Utilnivo

GUID Generator Online

Generate GUIDs online—the Microsoft name for standard UUID identifiers.

No registration
  • On your device

Browse more in Developer or all tools.

What is a UUID generator?

A UUID generator creates random unique identifiers (v4) for databases, APIs, and test data. IDs are generated locally in your browser.

Private on your device

Your information stays on your device and is not uploaded.

Related tools

This GUID generator online creates globally unique identifiers in standard UUID format for Windows-style APIs, .NET apps, and cross-platform databases. Generate random GUIDs locally and copy them into configs, SQL scripts, and test fixtures.

GUID and UUID refer to the same 128-bit identifier format—only naming differs by ecosystem.

Use version 4 random GUIDs unless your platform requires time-ordered v7 or COMB patterns.

How to use this tool

Click generate, copy the GUID string, and paste into your application, database migration, or mock API response.

Worked example

Example: generate `a3f2c1b0-9d8e-4f7a-b6c5-d4e3f2a1b0c9` for a SQL Server `uniqueidentifier` column seed script.

When to use this

  • Seeding .NET or SQL Server development databases.
  • Creating placeholder IDs in Swagger examples.
  • Generating correlation IDs for log demos.

Common examples

  • Generate v4 UUID for a new database primary key in local seed scripts.
  • Batch of five UUIDs for mock API fixtures in integration tests.
  • UUID for trace id in log correlation examples in documentation.
  • Ten UUID v4 values → seed rows for local integration test database.
  • UUID v7 batch → ordered IDs for event-sourcing demo data.

Common mistakes

  • Using GUID strings where integers would index faster.
  • Assuming GUIDs embed MAC addresses—modern v4 random GUIDs do not.
  • Reusing the same GUID across production and staging.

How it works

Generates UUID v4 (random) or v7 (time-ordered) identifiers using crypto-random bytes on your device. Supports bulk generation with optional uppercase and hyphen formatting.

Limitations

Results are based on the inputs you provide and may not cover every edge case. This tool is for general use and is not professional advice.

Privacy and file handling

Your data stays on your device and is not uploaded.

Related UUID Generator pages

These pages use the same uuid generator with examples tailored to different tasks.

FAQ

Frequently asked questions

Is GUID the same as UUID?

Yes. GUID is Microsoft's term for the RFC 4122 UUID format.

Uppercase or lowercase GUIDs?

Both are valid. SQL Server often displays uppercase; JSON APIs may prefer lowercase.

Can I generate multiple GUIDs?

Use bulk generation on the base UUID tool when you need many IDs at once.

Related pages

Page last reviewed: