UUID v1 · v4 · ULID

Unique IDs, generated in bulk

Generate UUID v1/v4 and ULID identifiers with custom case, hyphens and braces - all local, nothing leaks.

100% local · zero upload

Features

Multiple formats

UUID v1 (time-based), v4 (random), uppercase, no-hyphen, braces and ULID - all covered.

Bulk generation

Generate 1-1000 at once, one per line, and copy them all with a single click.

Runs locally

Uses the browser's cryptographic randomness (crypto) - nothing goes through a server.

Use cases

🖥 Database keys 📡 Request tracing 📄 File & resource IDs 🧪 Test data

UUID / ULID 生成器使用指南UUID / ULID Generator Guide

了解 UUID 与 ULID 的区别、支持的格式与常见问题。The difference between UUID and ULID, supported formats, and answers to common questions.

UUID 与 ULIDUUID vs ULID

UUID v4 是完全随机的 128 位标识符(36 字符,含连字符);UUID v1 结合时间戳与节点信息;ULID 是 128 位、26 字符的 Crockford Base32 编码,可排序且对人类更友好。

UUID v4 is a fully random 128-bit identifier (36 chars with hyphens); UUID v1 combines a timestamp with node info; ULID is a 128-bit, 26-character Crockford Base32 encoding that is sortable and more human-friendly.

本工具支持小写/大写、带/不带连字符以及大括号包裹等多种格式。

The tool supports lowercase/uppercase, with/without hyphens and brace-wrapped formats.

使用步骤How to Use

选择目标格式(UUID v1/v4 或 ULID 及变体)。Pick the format (UUID v1/v4, ULID or variants).
设置生成数量(1-1000)。Set the count (1-1000).
点击「生成」并「复制全部」。Click "Generate" then "Copy all".

常见问题FAQ

Q1. 生成的标识符唯一吗?Q1. Are the generated IDs unique?

UUID v4 的碰撞概率极低,ULID 在同一毫秒内也具备随机性,足以满足绝大多数场景。UUID v4 has a negligible collision probability; ULID stays random within the same millisecond. Plenty for most use cases.

Q2. 生成会泄露数据吗?Q2. Is anything uploaded?

不会,全部使用浏览器本地加密随机数生成,内容不经过服务器。No - everything uses the browser's local cryptographic randomness.

Q3. ULID 为什么可排序?Q3. Why are ULIDs sortable?

ULID 前 10 个字符是毫秒级时间戳,字典序即时间序。The first 10 characters encode a millisecond timestamp, so lexical order equals time order.