GUID/UUID Generator

Generate unique identifiers (GUIDs/UUIDs) in various formats

Generated GUIDs (1):

432c9a32-70d9-4726-a3ee-ce890fc0b79a

About GUIDs/UUIDs:

  • GUID: Globally Unique Identifier (Microsoft term)
  • UUID: Universally Unique Identifier (RFC standard)
  • Version 4: Random or pseudo-random generated
  • Format: 8-4-4-4-12 hexadecimal digits
  • Probability of collision: Negligible (1 in 2^122)

About the GUID / UUID Generator

Generate random version 4 UUIDs (also called GUIDs) for database keys, API identifiers, test fixtures and configuration. A UUID is a 128-bit value written as 32 hexadecimal digits in the 8-4-4-4-12 pattern, and the chance of two random UUIDs colliding is effectively zero. This generator can create up to 100 IDs at once, with options for uppercase, hyphen removal and ready-to-paste formats for C#, JavaScript, braces, parentheses or quotes.

How to use the GUID / UUID Generator

  1. Choose how many UUIDs you need (1–100).
  2. Pick an output format and whether to use uppercase or drop hyphens.
  3. Click Generate New GUIDs.
  4. Copy a single ID or copy all of them at once.

Frequently asked questions

What does the 4 in a v4 UUID mean?

The third group always starts with 4, which marks the UUID as version 4, meaning it was generated from random numbers rather than a timestamp or name.

Are these UUIDs unique?

With 122 random bits, duplicates are astronomically unlikely, so they are safe to use as unique identifiers without a central registry.

Is a GUID the same as a UUID?

Yes. GUID is the term Microsoft uses; UUID is the RFC 4122 name. The format is identical.