What is a UUID v4?
A UUID version 4 is a randomly generated 128-bit identifier commonly used for database keys, request IDs, invite codes, and test fixtures. It is useful when you need identifiers that are very unlikely to collide.
How to use this UUID generator
- Choose how many UUIDs you want to generate.
- Turn uppercase or hyphen-free formatting on if your workflow needs it.
- Select Generate UUIDs, then copy the batch you need.
When this tool helps
- Create seed data, mock API payloads, or test records quickly.
- Generate one-off identifiers for debugging and support workflows.
- Produce hyphenless or uppercase variants for systems with strict formatting rules.