About This Tool
What is UUID 生成器?
A tool for generating UUIDs (Universally Unique Identifiers). UUIDs are used to create unique identifiers without collision in distributed systems. They are commonly used for database primary keys, API request IDs, and session tokens.
How to Use
- Select the UUID version (default is v4).
- Enter the number of UUIDs to generate.
- Click 'Generate' to instantly create UUIDs.
- Click on a generated UUID to copy it.
Key Features
- UUID v4 (random-based) generation
- Batch generation of multiple UUIDs at once
- One-click copy functionality
- Cryptographically secure random number generation in browser
Tips
- UUID v4 uses 122 bits of random data, making collision probability extremely low.
- Using UUIDs as database primary keys prevents ID collisions in distributed environments.
- The UUID format consists of hexadecimal digits in 8-4-4-4-12 pattern.
UUID 生成器
生成随机 UUID (v4)
Frequently Asked Questions
UUID v4的碰撞概率是多少？▼
使用122个随机位，你需要生成约2.71×10^18个UUID才有50%的概率产生一次碰撞。实际上，UUID v4碰撞在现实应用中基本不可能发生。
UUID版本（v1、v4、v7）有什么区别？▼
UUID v1使用时间戳+MAC地址（可排序但暴露设备信息）。UUID v4是纯随机的（最流行，隐私性最强）。UUID v7（较新）使用时间戳+随机数据，兼具可排序性和随机性——非常适合数据库主键。
数据库主键应该用UUID还是自增ID？▼
UUID更适合分布式系统，因为可以独立生成无需协调。自增ID在单数据库环境中更简单且存储效率更高。UUID v7提供了良好的折中方案，具有时间排序的UUID同时保持索引性能。