UUID Generator

Generate various versions of UUIDs, support batch generation, format conversion and validation

Generate Options

UUID Version

Generate Count

Output Format

Case Type

Generate Results (0)

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About UUID

What is UUID?

UUID (Universally Unique Identifier) is a 128-bit identifier used to uniquely identify information in distributed systems. It consists of 32 hexadecimal digits, typically separated by hyphens in 8-4-4-4-12 format.

Use Cases

Database primary keys and unique identifiers
API request IDs and session identifiers
File system identifiers
Node identifiers in distributed systems
Test data generation
Frontend component key properties

UUID Version Differences

Version 1 (Time-based)：Generated based on timestamp and MAC address, contains time information, suitable for scenarios requiring time sorting. But may expose MAC address information.

Version 4 (Random)：Completely randomly generated, the most commonly used version. Simple and fast generation, extremely low collision probability, suitable for most application scenarios.

Version 5 (Namespace-based)：Generated based on namespace and name, the same namespace and name always generate the same UUID. Suitable for scenarios requiring deterministic UUID generation based on URL or domain name.

Version 7 (New Time-based)：2022 new standard, generated based on timestamp, provides better time precision and backward compatibility. Suitable for scenarios requiring time information but not wanting to expose MAC address.