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UUID Generator

Generate universally unique identifiers (UUID v4) for your applications. Create multiple UUIDs instantly.

Generate between 1 and 100 UUIDs at once

What is a UUID?

UUID (Universally Unique Identifier) is a 128-bit identifier that is guaranteed to be unique across all devices and time. UUIDs are standardized by the Open Software Foundation (OSF) as part of the Distributed Computing Environment (DCE).

UUID Format

A UUID is typically represented as 32 hexadecimal digits, displayed in five groups separated by hyphens:

xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx

Example: 550e8400-e29b-41d4-a716-446655440000

UUID Version 4

Our generator creates UUID version 4, which are randomly generated. With 122 random bits, there are 2^122 (about 5.3 × 10^36) possible UUIDs. This makes the probability of generating a duplicate UUID incredibly small - essentially zero for practical purposes.

Common Uses for UUIDs

  • Database Keys: Primary keys for database records across distributed systems
  • Session IDs: Unique identifiers for user sessions in web applications
  • File Names: Unique names for uploaded files to prevent collisions
  • Transaction IDs: Tracking financial transactions and orders
  • API Requests: Request tracking and idempotency keys
  • Distributed Systems: Identifying resources across multiple servers
  • Message Queues: Unique message identifiers in messaging systems
  • Cloud Resources: Identifying cloud resources and instances

Advantages of Using UUIDs

  • Global Uniqueness: Can be generated independently without coordination
  • No Central Authority: Don't require a central server to generate IDs
  • Scalability: Perfect for distributed systems and microservices
  • Collision-Free: Virtually impossible to generate duplicate IDs
  • Privacy: Don't reveal information about creation time or location
  • Portability: Can be generated on any system and merged without conflicts

Best Practices

  • Use UUIDs when you need guaranteed uniqueness across distributed systems
  • Store UUIDs in binary format in databases to save space (16 bytes vs 36 characters)
  • Consider using UUID v7 for time-ordered UUIDs if insertion performance is critical
  • Don't use UUIDs as user-facing identifiers - they're not memorable
  • Always validate UUID format when receiving them from external sources
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