GUID Generator
Generate Globally Unique Identifiers in several common formatting styles, from one to many at once.
About GUID Generator
GUIDs — Microsoft's name for UUIDs — are the standard way to give records a unique identity across systems that never talk to each other. This generator produces them in the formatting styles different platforms expect, so you can paste output straight into .NET code, SQL Server, or cross-platform applications without hand-editing.
Choose between standard lowercase, uppercase, or brace-wrapped styles and pick the count you need. Each GUID is built from cryptographically random data with the version bits set correctly. Because the formatting is applied for you, the output is consistent and matches what frameworks and databases expect.
Windows and .NET developers use braced or uppercase GUIDs to match C# literals and SQL Server conventions, while front-end and API developers use the standard lowercase form for JSON payloads and URL segments. Anyone merging data from multiple sources benefits from identifiers that can't collide.
How to Use
- Choose the GUID style: standard, uppercase, or braced.
- Pick how many to generate.
- Copy the output for your code or database.
Example
Braced style {550e8400-e29b-41d4-a716-446655440000}
Braced GUIDs wrap the standard 8-4-4-4-12 format in curly braces, a style common in .NET and some databases.
FAQ
What is the difference between GUID and UUID?
They're the same format; GUID is Microsoft's name for a UUID. This tool just adds extra formatting styles.
Which GUID style should I use?
Standard lowercase is the most interoperable. Uppercase is conventional in Windows ecosystems; braces match .NET code.
Are generated GUIDs guaranteed unique?
Practically yes — the randomness space is so large that the chance of collision is negligible for any realistic use.
Why do some systems display GUIDs in uppercase?
Windows and .NET tooling historically displayed GUIDs in uppercase, so code written for that ecosystem often expects that casing. The format is case-insensitive, but matching the local convention keeps diffs and greps clean.
Is a GUID the same thing as a UUID everywhere?
Yes, they refer to the same 128-bit identifier standard. GUID is the name used by Microsoft, while UUID comes from the RFC 4122 spec, so the two terms are interchangeable in practice.