UUID UUID Generator

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GUID Generator

Create Globally Unique Identifiers — Microsoft's term for UUIDs. A GUID and a UUID are the same 128-bit format; this tool generates RFC 4122-compliant v4 values you can paste into C#, .NET or Windows tooling.

  • GUID = UUID
  • v4 / RFC 4122
  • Nothing leaves your browser

GUID Generator

GUID
Between 1 and 1000.
Formatting

Result 0

    Generated locally with the Web Crypto API — nothing leaves your browser. Shortcut: Ctrl + Enter — Regenerated

    What is a GUID Generator

    A GUID (Globally Unique Identifier) is Microsoft's name for a UUID. Under the hood they are identical 128-bit values; the difference is terminology, not structure. Most Windows and .NET APIs accept either spelling.

    This generator produces v4 GUIDs — 122 random bits with the standard version and variant markers — so they work anywhere a UUID is expected, including SQL Server uniqueidentifier columns.

    How to

    1. Set how many GUIDs you need (1–1000).
    2. Toggle uppercase, hyphens and braces (braces match the .NET Guid.ToString("B") format).
    3. Press Generate and copy or export the batch.

    Use cases

    • .NET and C# code that needs System.Guid values.
    • SQL Server uniqueidentifier columns and keys.
    • COM and Windows component identifiers.

    Compare GUID Generator with other formats

    OptionWhen to use
    GUIDMicrosoft term for UUID
    UUID v4The same 128-bit format
    ULIDA different, sortable 26-char format

    Code examples

    C#

    Guid id = Guid.NewGuid();            // framework method
string s = id.ToString("B");          // {xxxxxxxx-...}

    SQL

    SELECT NEWID();  -- SQL Server
DECLARE @g uniqueidentifier = NEWID();

    Frequently asked questions

    Is a GUID the same as a UUID?

    Yes. GUID is Microsoft's name; UUID is the standards term (RFC 4122 / ISO/IEC 9834). They describe the identical 128-bit format.

    Should I use braces around a GUID?

    Only if the consumer expects them (for example .NET's Guid.ToString("B")). Otherwise the hyphenated form is the safe default.

    Are these GUIDs safe for primary keys?

    v4 GUIDs are fine as keys; if you need insertion order to be preserved in an index, consider UUID v7 instead.