How to use the UUID Generator (v4)
A UUID (Universally Unique Identifier) is a 128-bit label used for information in computer systems. 'Universally unique' means that practically no other computer in the world will generate the same identifier.
Version 4 (Random)
We use Version 4, which relies on random numbers. This ensures that the ID is not predictable and does not leak sensitive information like MAC addresses.
Database Keys
UUIDs are excellent for database primary keys in distributed systems because they can be generated independently on different servers without coordination/centralization.
The Formula
Frequently Asked Questions
Is there a chance of UUID collision?
The probability of a collision in UUID v4 is incredibly small (1 in 2^122). You could generate 1 billion UUIDs per second for 85 years and still have a lower probability of a single collision than being hit by a meteorite.
What is the difference between v1 and v4?
UUID v1 is generated using the host computer's MAC address and the current time. UUID v4 is generated using random numbers. v4 is generally preferred for privacy as it doesn't reveal the creator's identity/time.
Can I use UUIDs for filenames?
Absolutely. UUIDs are safe for filenames and URLs. However, they are not ordered chronologically, so sorting files by name won't sort them by creation date.