UUID v4 Generator - RFC 4122 Compliant Unique Identifier Tool
Generate RFC 4122 compliant UUID version 4 identifiers using cryptographically secure random numbers. Perfect for creating unique identifiers in databases, APIs, and distributed systems.
Features
- RFC 4122 Compliant: Follows the official UUID v4 specification
- Cryptographically Secure: Uses secure random number generation
- Multiple Formats: Uppercase, lowercase, with/without hyphens
- Bulk Generation: Create multiple UUIDs at once
- Copy Options: Copy individual UUIDs or all at once
- Format Validation: Verify UUID format and version
UUID v4 Format
UUID v4 follows the pattern: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
- The 13th character is always ‘4’ (version identifier)
- The 17th character is always ‘8’, ‘9’, ‘A’, or ‘B’ (variant identifier)
- All other characters are randomly generated hex digits
Common Use Cases
- Database primary keys and foreign keys
- API request and response identifiers
- Session tokens and tracking IDs
- File and document unique identifiers
- Distributed system correlation IDs
- Software licensing and activation keys
Technical Details
- Version: UUID v4 (random)
- Entropy: 122 bits of randomness
- Collision Probability: Negligible for practical purposes
- Format: 8-4-4-4-12 hexadecimal digits
- Case: Supports both uppercase and lowercase output