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Generator

UUID Generator

· Last updated：2025-09-23

Generate UUIDs (v1, v4, v5)

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Written by the Elysia Tools team

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Generator
Input types
select, number, text
Output type
text
Sample coverage
4
API ready
Yes

Overview

Generate unique identifiers instantly with our versatile UUID generator, supporting v1, v4, and v5 standards for your development and database needs.

When to use

  • When you need to generate unique primary keys for database records.
  • When creating session tokens or transaction IDs for web applications.
  • When you require deterministic identifiers based on specific namespaces for system integration.

How it works

  1. 1Select your preferred UUID version (v1, v4, or v5) from the version dropdown.
  2. 2Specify the number of UUIDs you need to generate, up to 100 at once.
  3. 3For v5, provide a namespace and a unique name string to ensure deterministic output.
  4. 4Click the generate button to instantly produce your unique identifiers.

Use cases

  • Database schema design requiring unique non-sequential primary keys.
  • Distributed systems needing to generate unique IDs without a central authority.
  • Software testing environments requiring bulk generation of unique mock data.

Examples

1. Bulk Database Key Generation

Backend Developer

Background

Setting up a new user table and needing 50 unique IDs for initial testing.

Problem

Manually creating unique strings is error-prone and slow.

How to use

Select UUID v4, set the count to 50, and click generate.

version: v4, count: 50

Outcome

A list of 50 unique, random UUIDs ready to be copied into the database script.

2. Deterministic ID Creation

System Architect

Background

Need to generate consistent IDs for internal resources based on domain names.

Problem

Standard random UUIDs don't allow for re-generating the same ID for the same resource.

How to use

Select UUID v5, choose the DNS namespace, and enter the resource name.

version: v5, namespace: dns, name: example.com

Outcome

FAQ

What is the difference between UUID v1 and v4?

UUID v1 is time-based and includes the node's MAC address, while UUID v4 is generated using random numbers.

Can I generate multiple UUIDs at once?

Yes, you can specify the count field to generate up to 100 UUIDs in a single batch.

What is a namespace in UUID v5?

A namespace is a predefined UUID used as a seed for v5 generation, ensuring that the same name always produces the same UUID.

Are these UUIDs globally unique?

UUID v4 provides a high degree of randomness, making collisions statistically improbable for most applications.

Do I need to install any software to use this?

No, this is a web-based utility that runs directly in your browser.

Hub

Authorized JWT, OTP, TOTP, and Session Test Workflow

Build sanitized auth fixtures, separate token generation from decoding and verification, test OTP/TOTP timing, and audit JWT and session evidence without exposing real secrets.

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A consistent, deterministic UUID that will always be generated for the input 'example.com' within the DNS namespace.