GUID Generator (Microsoft Format)

Generate GUIDs in Microsoft format — uppercase UUID v4 wrapped in braces. For .NET Guid parsers, SQL Server, registry entries, and Windows tooling.

uuid

guid

unique id

generator

developer

RFC 4122 / .NET Guid

Generate:UUID(s)

Click Generate to create UUIDs

A v4 UUID formatted Microsoft-style: uppercase, braced.

About GUID (Microsoft)

GUID (Globally Unique Identifier) is Microsoft's name for the same 128-bit identifier the rest of the world calls a UUID. The practical difference is formatting: Microsoft tools and APIs emit GUIDs in uppercase with surrounding braces — {F47AC10B-58CC-4372-A567-0E02B2C3D479} — which is exactly what .NET's Guid.NewGuid().ToString("B") produces and what SQL Server's uniqueidentifier column returns in many default contexts. Under the braces, every GUID this tool generates is a standards-compliant UUID v4 with 122 bits of cryptographic entropy, produced by crypto.randomUUID(). The bytes are identical to what you'd get from Node's crypto.randomUUID() or Postgres's gen_random_uuid() — only the string presentation differs. Paste it into a UUID library expecting lowercase-without-braces and it'll work after a trivial normalization step. Where the braced uppercase form matters: .reg file entries, C# source code, PowerShell scripts, COM interface identifiers (IID_*, CLSID_*), Windows registry keys, ASP.NET routing when the route parser demands a specific format. A historical wrinkle worth knowing: early Microsoft GUIDs used a different byte order (little-endian in the first three fields), so pre-2000 GUID-to-UUID conversions sometimes required byte swapping. Modern code no longer does this — today's GUIDs and UUIDs are binary-compatible. Only the string rendering differs, and that's what this generator handles for you.

Features

Generate cryptographically random UUID v4 identifiers
Create single or bulk UUIDs at once
Copy individual or all UUIDs to clipboard
Compliant with RFC 4122 standard

How to Use

Click "Generate" to create a new UUID
Set the quantity for bulk generation
Click any UUID to copy it to your clipboard
Use the generated UUIDs in your applications

Frequently Asked Questions

Is a GUID the same as a UUID?

Yes. "GUID" is Microsoft's name for the same 128-bit identifier. Modern GUIDs are UUIDs (usually v4) formatted in uppercase with braces. Where historical differences existed — byte order, specific version used — they've been reconciled. Today, on-the-wire bytes are identical; only string rendering differs.

Do I always need braces around the GUID?

Depends on the consumer. SQL Server's uniqueidentifier accepts both. .NET's Guid.ToString() supports five format specifiers (N, D, B, P, X) that wrap differently. Reg files and COM registrations generally want braces (format B). When in doubt, emit with braces — they're trivial to strip and unambiguous.

What format does .NET Guid.NewGuid() produce by default?

Guid.ToString() with no arguments returns lowercase without braces (format D). This tool emits uppercase with braces (format B), which is what .reg files, COM interface registration, and Windows registry entries use. Both are the same GUID; only the 6-char wrapping differs.

Can SQL Server's NEWID() produce the same format?

NEWID() returns an uppercase-without-braces GUID, which SQL Server's string functions display as an uppercase hyphenated UUID. Add braces in your application layer if you need format B. Under the bytes, every NEWID() GUID is a v4 UUID — the same as this tool produces.