UUID (Universally Unique Identifier) is a 128-bit identifier that is unique across space and time. It's displayed as 32 hexadecimal digits in the format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. UUIDs are used in databases, distributed systems, and software development to uniquely identify records without central coordination.

What is the difference between UUID v1 and UUID v4?

UUID v1 uses timestamp and MAC address, making it time-ordered but potentially revealing hardware information. UUID v4 uses cryptographic random numbers, providing better privacy and unpredictability. For most applications, UUID v4 is recommended due to its randomness and security properties.

How do I generate multiple UUIDs at once?

Use the bulk generation feature: 1) Select UUID version (v1 or v4), 2) Enter the number of UUIDs you need (1-50), 3) Click Generate. All UUIDs will appear in a list. You can copy them individually or use "Copy All" to copy all UUIDs at once, one per line.

Are the generated UUIDs truly unique?

Yes, UUID v4 uses cryptographic random number generation (crypto.randomUUID()), making collisions astronomically unlikely. The probability of generating duplicate UUID v4 is approximately 1 in 2^122, which is effectively zero for practical purposes.

Is this UUID generator free?

Yes, this UUID generator is completely free with no limitations. Generate unlimited UUIDs, no registration required, and all generation happens in your browser for privacy and speed.

UUID生成器

支持批量生成UUID v1/v4

设置

选择UUID版本和数量

版本

数量

结果

尚未生成UUID

点击生成按钮创建UUID

什么是UUID？

UUID v4 (随机)

UUID v4使用加密随机性随机生成。适用于大多数情况。

UUID v1 (时间戳)

UUID v1基于时间戳，包含创建时间。可以按时间顺序排序。

提示

• UUID v4是随机生成的，最常用

• UUID v1基于时间戳，可以按创建时间排序

• 点击任意UUID即可复制到剪贴板

• 使用'复制全部'可一次复制所有UUID (每行一个)