UUID Generator
Create random version-4 UUIDs individually or in bulk.
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Generate random version 4 UUIDs for database keys, test data, API identifiers and more. Create a single UUID or a whole batch at once, then copy them with one click. UUIDs are produced with your browser's secure random generator, so they are unique and never leave your device.
Identifiers that do not need a central authority
The usual way to give records unique identifiers is a database counter, which works until you have more than one system creating records. Then two machines both produce record 41 and you have a collision. A version 4 UUID is 122 random bits, which any system can generate independently with no coordination and effectively no chance of clashing with another. That independence is the entire point.
How safe is effectively never
The usual question is whether two UUIDs could ever be identical. Mathematically yes, practically no. You would need to generate billions of them per second for many years before a collision became likely. For any normal application the risk is far smaller than the risk of the hardware failing, which is why nobody designs around it.
Things worth knowing
- Version 4 is random and is what you want unless you have a specific reason otherwise.
- UUIDs carry no meaning and no ordering, so they do not tell you which record came first.
- They are 36 characters with hyphens, which makes them poor choices for URLs people type.
- Random does not mean secret. Do not use a UUID as a password or an access token.
How to use UUID Generator
- 1
Choose how many UUIDs you need.
- 2
Click generate.
- 3
Copy a single UUID or the whole list.
Frequently asked questions
It generates random version 4 (v4) UUIDs, the most common type for unique identifiers.