What is a UUID?
A UUID, or universally unique identifier, is a 128-bit value that looks like five groups of hex characters. Its whole point is uniqueness: two systems can create identifiers independently without ever matching.
This generator creates version 4 UUIDs, the kind built from secure random numbers. Each one is practically unique, which makes them perfect for database keys and record IDs.
How to use this tool
- Set how many UUIDs you need, up to 100.
- Click Generate.
- Copy them one at a time or all at once.
- Use Uppercase if your system needs capital letters.
Where UUIDs shine
- Database primary keys that never need to be guessed.
- File names that must not clash across uploads.
- Public order or session identifiers.
Why version 4
Version 4 is the simplest to generate safely because it relies on randomness instead of time and machine information. That makes it the default choice for most modern applications.
Frequently Asked Questions
A universally unique identifier is a 128-bit value usually written as 32 hex characters in five groups. Its job is to be unique enough that two systems can create them without colliding.
Version 4 UUIDs are built from random numbers. The version digit is set to 4 and the variant bits are set to a fixed pattern, and the rest is pure randomness.
Version 4 uses 122 random bits, so collisions are practically impossible. For everyday use like database keys, they are more than safe.
Database primary keys, file names, order numbers, session ids and anywhere you need an identifier without coordinating with a central server.
A few systems or databases expect uppercase hex. The Uppercase button converts the whole set instantly so it matches those requirements.
No. UUIDs are generated on your device using your browseru2019s random number generator. Nothing is sent to a server.