UUID v4 Generator
Generate cryptographically random UUID v4 identifiers in your browser.
What this tool does
The generator creates UUID version 4 identifiers for test data, records and objects that need a practically unique label. They are useful for general identification, but should not be treated as passwords, access tokens or a substitute for a security design.
How to use it
Enter the values requested by the calculator and check the result together with the notes shown below it.
Practical example
Use a realistic example from your own setup to compare scenarios. The result is a reference, not a replacement for manufacturer specifications.
How to interpret the result
Treat the result as an estimate whenever real-world factors are not available to the browser. For hardware, network or safety decisions, verify the relevant technical specifications.
Frequently asked questions
What is a UUID?
It is a 128-bit unique identifier, written as 32 hexadecimal characters separated by hyphens and widely used in databases and APIs.
Can a UUID repeat?
In theory yes, but with random UUIDs the chance of a collision is so low that in practice it is treated as unique.