What is UUID Generator — v1, v4, v5?
The UUID Generator creates Universally Unique Identifiers (UUID) complying with RFC 4122. It generates UUID version 1 (timestamp-based), version 4 (fully random), and version 5 (name-based using SHA-1 hashing). UUIDs are 128-bit numbers represented as 32 hexadecimal digits separated by hyphens, guaranteed to be globally unique across databases and networks.
How to Use UUID Generator — v1, v4, v5
- Select the UUID version you wish to generate (Version 4 is the most common for random IDs).
- Input the number of UUIDs you want to create (e.g., generate up to 100 UUIDs in a single batch).
- Toggle options such as uppercase letters or braces if needed.
- Click 'Generate'. Copy the generated UUIDs to your clipboard.
Common Use Cases
- Database designers creating unique primary key values for distributed database systems where autoincrement IDs are not feasible.
- API developers creating transaction reference numbers, tracking IDs, or file names.
- QA engineers seeding mock datasets for system performance and integration testing.
Pro Tips & Best Practices
- UUID Version 4 is 100% random and is the best choice for unique entity IDs. Version 1 is useful if you need to extract the creation timestamp from the ID itself.
- The probability of a UUID version 4 collision is so small that it is virtually zero — you would need to generate billions of UUIDs per second for years to find a duplicate.