AppsFactory

UUID Generator

Generate random UUID v4 identifiers instantly

Options

Single UUID

5ebacf93-d779-41e1-97bf-973d51f29c3a

Bulk Generation

Total UUIDs generated this session: 1

UUID Generator - Create Unique Identifiers Online

Generate universally unique identifiers (UUIDs) instantly with our free UUID Generator. Create single or bulk UUIDs in standard v4 format, ready to use as database keys, session tokens, or resource identifiers. All generation happens in your browser with cryptographically secure randomness.

Features

  • UUID v4 generation using cryptographically secure random values
  • Bulk generation to create up to 1,000 UUIDs at once
  • Multiple format options including standard hyphenated, uppercase, lowercase, and without hyphens
  • One-click copy to quickly grab a single UUID or the entire batch
  • Download as text file for large batches you need to import elsewhere
  • Automatic validation that confirms every generated UUID conforms to the RFC 4122 specification
  • Nil UUID reference showing the all-zero UUID for edge-case testing

How to Use

  1. Open the UUID Generator and a fresh UUID v4 will be ready for you immediately.
  2. Click "Generate" to create a new UUID, or adjust the quantity slider for bulk generation.
  3. Choose your preferred format (hyphenated, no hyphens, uppercase) from the format dropdown.
  4. Click the copy button next to any UUID to place it on your clipboard.
  5. For large batches, use the download button to save all generated UUIDs as a plain text file.

Use Cases

  • Database primary keys: Use UUIDs instead of auto-incrementing integers for distributed databases where collision avoidance matters.
  • API resource identifiers: Assign unique IDs to resources in REST or GraphQL APIs without coordinating with a central authority.
  • Testing and development: Generate placeholder IDs quickly when building mock data or writing unit tests.
  • Session management: Create unique session tokens for user authentication workflows.

FAQ

What is a UUID v4?

A UUID v4 is a 128-bit identifier generated from random or pseudo-random numbers. It follows the format xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx, where 4 indicates the version and y is one of 8, 9, a, or b. The probability of generating a duplicate is astronomically low.

Are these UUIDs safe to use in production?

Yes. The tool uses the Web Crypto API, which provides cryptographically strong random values. The output is identical in quality to what you would get from most server-side UUID libraries.

Can I generate UUID v1 or v5?

This tool focuses on UUID v4, which is the most widely used version for general-purpose unique identifiers. Version 1 (timestamp-based) and version 5 (name-based with SHA-1) are not currently supported.