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UUID Generator

Generate random UUID/GUID version 4 identifiers with our powerful online tool. Features include batch generation, format options, and clipboard integration.

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UUID Generator Options

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What is a UUID Generator?

A UUID (Universally Unique Identifier) Generator is a tool that creates unique 128-bit IDs based on the RFC 4122 standard. These identifiers are designed to be globally unique across space and time, making them perfect for distributed systems where unique identification is critical.

UUIDs are represented as 32 hexadecimal digits, displayed in 5 groups separated by hyphens. They're widely used in software development for primary keys in databases, tracking objects across systems, and generating random session tokens.

Our free online UUID Generator supports multiple UUID versions, including the commonly used Version 4 (random), as well as Version 1 (time-based), Version 3 (MD5 hash-based), Version 5 (SHA-1 hash-based), and NIL UUID. The tool offers customization options including batch generation, case formatting, and hyphen removal.

How to Use Our UUID Generator

  1. Select the UUID version you want to generate
  2. Set the number of UUIDs to generate (except for NIL UUID)
  3. For hash-based UUIDs (v3 and v5), specify the namespace and name
  4. Choose formatting options (uppercase or lowercase, with or without hyphens)
  5. Click "Regenerate" to create new UUIDs any time
  6. Copy individual UUIDs or all at once to your clipboard
  7. Download all generated UUIDs as a text file

Supported UUID Versions

Version 1 - Time-based

Generated using the current timestamp and MAC address. Useful when you need to track when an ID was created. Format: xxxxxxxx-xxxx-1xxx-yxxx-xxxxxxxxxxxx

Version 3 - MD5 Hash-based

Generated by applying MD5 hash to a namespace and name. Produces the same UUID for the same inputs. Format: xxxxxxxx-xxxx-3xxx-yxxx-xxxxxxxxxxxx

Version 4 - Random

Generated using random or pseudo-random numbers. The most commonly used version for general purposes. Format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx

Version 5 - SHA-1 Hash-based

Similar to v3, but uses SHA-1 hash instead of MD5. More secure and recommended over v3. Format: xxxxxxxx-xxxx-5xxx-yxxx-xxxxxxxxxxxx

NIL UUID

Special UUID with all bits set to zero: 00000000-0000-0000-0000-000000000000. Used for special cases or as a default value.

Key Features

Generation Options

  • Support for all RFC 4122 UUID versions
  • Generate up to 100 UUIDs at once
  • Choose uppercase or lowercase format
  • Option to remove hyphens
  • Namespace and name settings for v3/v5

Output Options

  • Copy to clipboard (single or all)
  • Download as text file
  • List and grid view options
  • Visual display with monospace font
  • Immediate regeneration

Use Cases

  • Database primary keys (v4 recommended)
  • Distributed system identifiers
  • Time-ordered sequences (v1)
  • Content-derived IDs (v3/v5)
  • Session tokens and security

User Experience

  • Clean, modern interface
  • Responsive design for all devices
  • Context-aware options based on UUID version
  • No login required
  • Works in all modern browsers

Why Use Our UUID Generator?

Our UUID Generator tool offers several advantages for developers and system administrators:

  • Complete version support: Generate any type of UUID for your specific requirements
  • Privacy-focused: All UUIDs are generated directly in your browser - we don't store any data
  • Versatile options: Multiple format options, batch generation, and advanced settings
  • Educational: Learn about different UUID versions and their applications
  • Instant access: No need to install any software or register
  • Export flexibility: Copy to clipboard or download as a text file

UUID Version Format

All UUIDs follow the format: xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx where:

  • x is any hexadecimal digit (0-9, a-f)
  • M is the version number (1, 3, 4, 5 or 0 for NIL)
  • N is a variant digit (8, 9, a, or b for RFC 4122 UUIDs)

The probability of generating two identical UUIDs is extremely low, especially for version 4, making them suitable for most distributed computing applications where uniqueness is essential.

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