Frequently Asked Questions
Answers to the most frequently asked questions about UUID and our generator.
For most applications, UUID v4 (random) is the best choice. If you need sortable IDs, use v7. For deterministic IDs based on input, use v5.
While not mathematically guaranteed, the probability of collision is astronomically low. With v4, you'd need to generate 1 billion UUIDs per second for 85 years to have a 50% chance of one collision.
Yes! UUIDs are excellent for distributed databases. However, random UUIDs (v4) can cause index fragmentation. Consider UUID v7 for better database performance.
They're essentially the same thing. GUID is Microsoft's term for UUID. Both follow the same RFC 4122 standard.
UUID v7 includes a timestamp, making it sortable and more efficient for database indexing. It's recommended for new projects where ordering matters.
UUID v4 uses cryptographically secure random numbers and is safe for security tokens. Never use v1 for security as it exposes MAC address and time.
Need More Information?
Check out our detailed blog articles or documentation for specific UUID versions.