How to Generate a UUID

Quick guide · 2 min read

Quick Answer

A UUID (Universally Unique Identifier) is a 36-character string used to uniquely identify information. Use a UUID generator to instantly create unique IDs for your applications.

UUID Generator

Generate unique UUIDs instantly

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Common Use Cases

  • Database primary keys - UUIDs make good distributed primary keys
  • Session IDs - Unique identifiers for user sessions
  • File naming - Avoiding filename collisions
  • API request IDs - Tracking requests across services

Step-by-Step Guide

  1. Go to the UUID Generator - Open the UUID Generator tool
  2. Choose your options - Select UUID version (v4 is most common) and how many to generate
  3. Copy your UUIDs - The tool generates unique UUIDs instantly. Copy and use them in your application

Example

Input:

Need a unique ID

Output:

550e8400-e29b-41d4-a716-446655440000

Frequently Asked Questions

What is a UUID? ▼
UUID (Universally Unique Identifier) is a 128-bit number used to identify information in computer systems. The standard format is 32 hexadecimal digits separated by hyphens.
What's the difference between UUID v1 and v4? ▼
UUID v1 is generated from the computer's MAC address and timestamp. UUID v4 is generated from random numbers. V4 is more commonly used because it doesn't reveal any system information.
Are UUIDs truly unique? ▼
UUIDs are designed to be practically unique. With UUID v4, the probability of generating a duplicate is extremely low (about 1 in 2.7 quintillion). For most applications, collisions are not a concern.
Can I use UUIDs as database primary keys? ▼
Yes. UUIDs are commonly used as primary keys, especially in distributed systems. They allow records to be created independently without coordination between servers.