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