UUID v4 Generator Tool - Generate Single or Bulk Universally Unique Identifiers (UUIDs) Online for Free

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UUID Version 4 Generator - Random UUIDs

Generate RFC 4122 compliant UUID version 4 identifiers using cryptographically strong random number generation. Our free UUID v4 generator creates universally unique identifiers perfect for database keys, API tokens, session management, and distributed system identification.

UUID v4 uses pure randomness to ensure uniqueness across different systems, applications, and time periods. Each generated UUID has extremely low collision probability, making them ideal for microservices, cloud applications, and any system requiring guaranteed unique identifiers.

UUID Version 4 Specifications

RFC 4122 compliant random UUID generation

128-bit identifier with 122 random bits

Standard format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx

Cryptographically secure random number generation

Version 4 indicator in the 13th hexadecimal digit

Variant bits set according to RFC standards

Bulk generation up to 1000 UUIDs at once

When to Use UUID Version 4

• Database Design: Primary keys for distributed databases and sharding

• API Development: Request tracking, resource identification, and session tokens

• Microservices: Service-to-service communication and event correlation

• File Systems: Unique file naming and temporary resource identification

• Security: Non-sequential identifiers that don't reveal creation patterns

UUID v4 vs Other Versions

No dependency on MAC address or timestamp (unlike v1)

Maximum privacy - no machine-identifying information

Completely random - unpredictable sequence generation

Suitable for public-facing systems and APIs

Better for security-sensitive applications

Ideal when you need pure randomness over time-based ordering