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UUID Generator - Unique Identifier Tool

Generate universally unique identifiers (UUID v4) for your applications. Create random 128-bit identifiers that are unique across space and time.

Generate UUID v4

About UUIDs

UUID (Universally Unique Identifier) is a 128-bit identifier that is unique across both space and time. This tool generates version 4 UUIDs, which are randomly generated.

UUID v4 format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx

Where x is any hexadecimal digit, 4 indicates version 4, and y is either 8, 9, a, or b.

UUIDs are commonly used in databases, APIs, and distributed systems where unique identifiers are needed without requiring a central authority to issue them.

What is a UUID?

UUID (Universally Unique Identifier) is a 128-bit identifier standard used to uniquely identify information in computer systems. Version 4 UUIDs are randomly generated, ensuring practically zero probability of duplication across space and time.

UUIDs follow the format xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx, where 4 indicates version 4 and y is limited to specific values (8, 9, a, or b) to ensure proper formatting and uniqueness.

Key Features

  • Multiple generation: Create multiple UUIDs simultaneously with add/remove controls
  • Instant generation: Real-time UUID creation using cryptographically secure randomness
  • Copy functionality: Individual copy buttons for each UUID or copy all at once
  • Regeneration: Refresh all UUIDs while maintaining your quantity preference
  • RFC 4122 compliant: Standards-compliant version 4 UUID format
  • No server dependency: All generation happens locally in your browser

Common Use Cases

Database Primary Keys

Generate unique identifiers for database records without requiring central coordination or auto-increment sequences.

API Development

Create unique request IDs, session tokens, and resource identifiers for REST APIs and microservices.

Distributed Systems

Generate conflict-free identifiers across multiple servers and services without coordination overhead.

File Naming

Create unique file names for uploads, temporary files, and document management systems.

How to Use the UUID Generator

Step-by-Step Instructions

  1. The tool starts with one generated UUID ready to use
  2. Click the + button to add more UUIDs (or - to remove them)
  3. Copy individual UUIDs using the Copy button next to each one
  4. Use "Copy All" to copy all generated UUIDs to your clipboard
  5. Click "Regenerate All" to create new UUIDs while keeping the same quantity
  6. Each UUID is guaranteed to be unique and properly formatted

Pro Tips

  • Version 4 UUIDs are purely random with no embedded information
  • The probability of generating duplicate UUIDs is negligible
  • UUIDs work across different systems without coordination
  • Generate multiple UUIDs when you need bulk unique identifiers
  • UUIDs are case-insensitive but typically stored in lowercase
  • Each UUID contains 122 bits of randomness (6 bits are fixed)

Why Use Our UUID Generator?

Our UUID generator provides RFC 4122 compliant version 4 UUIDs with the ability to generate multiple identifiers simultaneously. Unlike simple generators, it offers convenient bulk generation and individual copy functionality for efficient workflow.

Perfect for developers, database administrators, and system architects who need reliable unique identifiers. The tool generates cryptographically secure UUIDs locally in your browser, ensuring privacy and eliminating network dependencies.