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UUID Generator

Generate unique identifiers instantly with our UUID tool. Perfect for software development, databases, and more.

What is UUID?

A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. Key features include:

  • 36-character string containing numbers, letters, and dashes
  • Format: 8-4-4-4-12 (e.g., 123e4567-e89b-12d3-a456-426655440000)
  • Designed to be globally unique
  • Can be generated without central coordination

FAQs

How are UUIDs formatted?

UUIDs are written as 32 hexadecimal digits grouped in 5 sections, separated by hyphens: 8-4-4-4-12.

Are UUIDs case-sensitive?

No, UUIDs are not case-sensitive. They use numbers (0–9) and letters (a–f), with no distinction between upper and lowercase.

Can a UUID be repeated?

UUID collisions are extremely unlikely. For version 4 UUIDs, there are approximately 5.3 × 10^36 possible combinations.

What are the different UUID versions?

  • Version 1: Based on timestamp and MAC address
  • Version 2: DCE Security version
  • Version 3: Name-based (using MD5 hash)
  • Version 4: Randomly generated
  • Version 5: Name-based (using SHA-1 hash)

How can I validate a UUID format?

Use the following regex pattern to validate a UUID format:

[0-9a-fA-F]8-[0-9a-fA-F]4-[0-9a-fA-F]4-[0-9a-fA-F]4-[0-9a-fA-F]12

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