UUID Generator

Generate random v4 UUIDs

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About UUID Generator

UUID (Universally Unique Identifier) v4 is a 128-bit identifier that is randomly generated and virtually guaranteed to be unique. This free UUID generator creates RFC 4122 compliant UUIDs instantly, making it perfect for database primary keys, distributed systems, API identifiers, session tokens, and any scenario where you need a guaranteed unique identifier.

UUID Format:

UUIDs are displayed as 32 hexadecimal digits, grouped into five sections separated by hyphens:xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx

  • The "4" indicates version 4 (random UUID)
  • The "y" is one of 8, 9, A, or B (variant bits)
  • Total of 122 random bits (the rest are version/variant bits)

Why Use UUIDs?

  • Uniqueness: Extremely low probability of collision (virtually zero)
  • Distributed Systems: Generate IDs without coordination between systems
  • Database Keys: Avoid conflicts when merging databases or replicating data
  • Security: Harder to guess than sequential IDs
  • Privacy: Don't reveal information about record count or creation order
  • Standard Format: Widely supported across programming languages and databases

Common Use Cases:

  • Database Primary Keys: Unique identifiers for database records
  • API Resource IDs: Unique identifiers for REST API resources
  • Session Tokens: Unique session identifiers
  • File Names: Generate unique file names to avoid conflicts
  • Transaction IDs: Unique identifiers for financial transactions
  • Distributed Systems: Generate IDs across multiple servers without coordination

UUID Versions:

While this generator creates UUID v4 (random), there are other UUID versions:

  • UUID v1: Based on MAC address and timestamp
  • UUID v3: Name-based using MD5 hashing
  • UUID v4: Random (most common, what this tool generates)
  • UUID v5: Name-based using SHA-1 hashing

This UUID generator is completely free and generates cryptographically secure random UUIDs. Generate as many as you need - there's no limit!