How to generate UUIDs
- Choose version 4 or 7.
- Set how many and the format.
- Copy the list or download it as a text file.
About this tool
Make unique identifiers for databases, files and tests. Version 4 is entirely random. Version 7 begins with the time it was made, so a database can keep new IDs in order, and the tool keeps them sorted even when many are made in the same millisecond. Make up to 10,000 at once.
Common questions
Which version should I use?
Use version 4 for plain random IDs. Use version 7 as database keys, because ordered keys are faster to store.
Can two UUIDs be the same?
In practice no. The chance of a repeat is so small that it can be ignored.
Is it free to use?
Yes. There's no sign-up, and you can use it as often as you like.
Is my text uploaded anywhere?
No. This tool runs inside your browser, so what you enter stays on your device.
Do I need to install anything?
No. It works in your browser on a computer or a phone.