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Generate cryptographically secure UUID v4 (Universally Unique Identifiers) for your applications. Perfect for database primary keys, API identifiers, and unique resource naming. Supports bulk generation of up to 100 UUIDs at once.

UUID Generator

Generate 1-100 UUIDs at once
Privacy: All UUIDs are generated locally in your browser using the Web Crypto API. No data is sent to any server or stored.

How to Use

  1. Click "Generate UUID" to create a single unique identifier
  2. Click the copy button to copy the UUID to your clipboard
  3. For multiple UUIDs, enter the count (1-100) and click "Generate Multiple"
  4. Choose your preferred format: lowercase, uppercase, or without hyphens
  5. Use "Copy All UUIDs" to copy all generated UUIDs at once

Common Uses:

  • Database Keys: Use as primary keys for database records
  • API Identifiers: Create unique IDs for API resources and sessions
  • File Naming: Generate unique filenames to avoid conflicts
  • Transaction IDs: Track transactions and events with unique identifiers
  • Testing: Generate test data with unique identifiers
  • Distributed Systems: Create IDs without coordination across systems

Frequently Asked Questions

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. UUID v4 uses random numbers to ensure uniqueness with extremely low collision probability.

How unique are UUIDs?

UUID v4 provides 122 bits of randomness, making the probability of collision astronomically low. You can generate trillions of UUIDs before having a reasonable chance of duplication.

What is UUID v4?

UUID v4 is a version that generates identifiers using random or pseudo-random numbers. It's the most commonly used UUID version and requires no network card MAC address or timestamp.

Can I use UUIDs as database primary keys?

Yes, UUIDs are commonly used as primary keys in databases. They provide globally unique identifiers without requiring coordination between systems, making them ideal for distributed databases and microservices.

What's the difference between UUID formats?

Standard UUID format uses lowercase with hyphens (e.g., 550e8400-e29b-41d4-a716-446655440000). Uppercase uses capital letters, and no-hyphens format removes the dashes for a continuous 32-character string. All formats represent the same unique identifier.

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