UUID v4 Generator

Generate cryptographically secure UUID v4 identifiers for use in databases, APIs, and applications. Generate single UUIDs or multiple UUIDs at once. All generation happens locally in your browser.

How it works

What is a UUID?

UUID (Universally Unique Identifier) is a 128-bit identifier that is guaranteed to be unique across space and time. UUID v4 uses random numbers to generate identifiers, making them ideal for distributed systems where coordination is difficult.

How to Use the UUID Generator

Click "Generate UUID" to create a single UUID v4 identifier. To generate multiple UUIDs, enter a count between 1 and 20 in the count field and click generate. All UUIDs will be displayed, one per line, ready to copy.

Example 1: Single UUID

Generated UUID: 550e8400-e29b-41d4-a716-446655440000

This is a standard UUID v4 format: 8-4-4-4-12 hexadecimal characters separated by hyphens.

Example 2: Multiple UUIDs

Generate 5 UUIDs:

550e8400-e29b-41d4-a716-446655440000\n6ba7b810-9dad-11d1-80b4-00c04fd430c8\n6ba7b811-9dad-11d1-80b4-00c04fd430c8\n6ba7b812-9dad-11d1-80b4-00c04fd430c8\n6ba7b813-9dad-11d1-80b4-00c04fd430c8

UUID v4 Format

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

Where:

  • x is any hexadecimal digit (0-9, a-f)
  • 4 indicates version 4 (random UUID)
  • y is one of: 8, 9, a, or b

Common Use Cases

UUIDs are widely used in software development:

  • Database Primary Keys: Unique identifiers for database records
  • API Tokens: Secure tokens for API authentication
  • Session IDs: Unique session identifiers
  • File Names: Unique file identifiers
  • Distributed Systems: Unique IDs across multiple servers
  • Event IDs: Unique identifiers for events and logs

Privacy & Security

UUID generation happens entirely in your browser using cryptographically secure random number generation. No data is sent to any server, ensuring complete privacy.

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