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GUID Generator

Generate GUIDs (globally unique identifiers) in registry format with braces, uppercase, and bulk options.

Generated with your browser's crypto API - nothing is sent to a server.

{ec1bcc23-d1f8-4207-801b-a54b70f7d365}

UUID Inspector

Paste any UUID to identify its version - v7 UUIDs reveal their embedded creation timestamp.

UUID Format Breakdown

xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
  • 4 is the version digit (4 = random, 7 = time-sortable)
  • y is the variant (8, 9, a, or b)
  • In v7, the first 48 bits are a Unix millisecond timestamp, so IDs sort by creation time
  • Total: 128 bits = 32 hex digits + 4 dashes = 36 characters

Code Examples

var guid = Guid.NewGuid();
guid.ToString();     // "21ec2020-3aea-4069-a2dd-08002b30309d"
guid.ToString("B");  // "{21ec2020-3aea-4069-a2dd-08002b30309d}"
guid.ToString("N");  // "21ec20203aea4069a2dd08002b30309d"

Frequently Asked Questions

What is the difference between a GUID and a UUID?

Nothing structural - GUID is Microsoft's name for a UUID. Windows APIs, .NET, and COM use 'GUID' and often write them in braces like {21EC2020-3AEA-4069-A2DD-08002B30309D}; everyone else says UUID.

How do I generate a GUID in C#?

Guid.NewGuid() creates a random (v4) GUID. Format with .ToString("B") for braces, "N" for no dashes, or "D" (default) for the standard dashed form.

Are GUIDs guaranteed to be unique?

Not mathematically guaranteed, but with 122 random bits the collision probability is so small it is treated as zero in practice - you could generate a billion GUIDs per second for decades without an expected collision.

Related Tools

UUID Generator

Generate random UUIDs (v4) and time-sortable UUIDs (v7) in bulk.

UUID v7 Generator

Generate time-sortable UUID v7 identifiers, in bulk, with a built-in v7 timestamp inspector.

Hash Generator

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text or files, with optional HMAC keys.

This tool runs entirely in your browser - nothing you enter is uploaded or stored.