UUID7 Generator
Generate time-ordered UUIDs with random data
IDUUID4 Generator
Generate random UUIDs
UUID4
Click 'Generate' to create your first UUID4
About UUID4 Generator
UUID4 (Universally Unique Identifier version 4) is the most widely adopted UUID standard, generating completely random 128-bit identifiers using cryptographically secure random number generation. These identifiers are perfect for applications requiring unique keys without any predictable patterns or information leakage.
Our UUID4 generator creates identifiers with 122 bits of entropy, ensuring virtually zero collision probability even when generating billions of UUIDs. The tool supports bulk generation, formatted output, and instant copying for seamless integration into your development workflow.
UUID4 is ideal for database primary keys, session identifiers, API tokens, file names for uploads, transaction references, and any scenario where you need guaranteed unique identifiers. Its random nature makes it perfect for security-sensitive applications and distributed systems.
Unlike time-based UUIDs, UUID4 reveals no information about when or where it was created, providing maximum privacy and security. The format is standardized across all platforms and programming languages, ensuring compatibility and interoperability in any environment.
Key Features
- Cryptographically secure random generation
- 122 bits of entropy for collision resistance
- No information leakage about creation time or location
- Standard RFC 4122 compliant format
- Instant bulk generation capabilities
- One-click copy to clipboard functionality
UUID4 Frequently Asked Questions
What makes UUID4 different from other UUID versions?
UUID4 is completely random, unlike UUID1 which includes timestamp and MAC address, or UUID3/5 which are deterministic based on input data. This randomness makes UUID4 perfect for security-sensitive applications where information leakage must be avoided.
How likely is it to generate duplicate UUID4s?
The probability of generating duplicate UUID4s is astronomically low. With 122 bits of entropy, you would need to generate about 2.6 × 10^18 UUIDs to have a 50% chance of a single collision. For practical applications, duplicates are impossible.
Can UUID4 be used as database primary keys?
Yes, UUID4 makes excellent database primary keys, especially for distributed systems. They're globally unique, don't reveal business logic, and work perfectly across multiple databases. However, they're not naturally sorted by creation time like UUID7.
Is UUID4 secure enough for authentication tokens?
Absolutely. UUID4 uses cryptographically secure random number generation with no predictable patterns. This makes them suitable for session tokens, API keys, and other security-critical identifiers where unpredictability is essential.
Pro Tips
- Use UUID4 for most general-purpose unique identifier needs
- Store UUIDs as binary in databases for better performance
- Consider UUID7 if you need time-based sorting
- Always use the canonical 8-4-4-4-12 format for compatibility
Related Tools
Other tools that might be useful for your workflow