What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. UUIDs are designed to be unique across space and time, making them ideal for distributed systems.

UUID Versions

• UUID v1: Time-based UUID that includes timestamp and MAC address
• UUID v4: Random UUID generated using random or pseudo-random numbers
• UUID v5: Name-based UUID generated from a namespace and name using SHA-1

When to Use Different UUID Versions

• v1: When you need sortable UUIDs or want to avoid collisions based on time
• v4: Most common choice for general-purpose unique identifiers
• v5: When you need deterministic UUIDs based on names or URLs

UUID Generator Features

• Generate UUIDs in versions 1, 4, and 5
• Custom namespace support for v5
• Copy to clipboard functionality
• Cryptographically secure generation