Which UUID version should I use for different use cases?

Our uuid generator supports versions 1, 4, 6, 7, and 8. Choose based on your needs: UUID v4 (random) is the most common — best for general use like database primary keys, session tokens, and API keys. The uuid4 generator provides 122 bits of randomness and is cryptographically secure. Use UUID v7 for time-sortable IDs in databases — it includes millisecond precision, making it perfect for sorting by creation time. The guid generator (Microsoft's equivalent) is also supported. Random uuid v1 is legacy and uses MAC addresses — avoid for privacy reasons. Use this online uuid generator for any scenario requiring unique identifiers. The unique id generator tool processes everything locally, ensuring privacy. For most modern applications, v4 or v7 are the best choices.