What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit label used for information in computer systems to uniquely identify resources.
Are they truly unique?
While not strictly guaranteed, the probability of a duplicate (collision) is so astronomically low that it's effectively zero for all practical purposes.
Which version of UUID is this?
This tool generates UUID Version 4, which are randomly generated using your browser's cryptographic capabilities.
Can I use these for database keys?
Yes, UUIDs are excellent for use as primary keys, particularly in distributed systems where uniqueness across nodes is required.
Do I need internet access?
No, the generation happens entirely offline within your browser using the crypto API. No data is sent to any server.
What is the collision probability?
It's infinitesimally small. You would need to generate billions of UUIDs per second for years to have even a tiny chance of a duplicate.
What is the difference between UUID and GUID?
They are effectively the same thing. GUID (Globally Unique Identifier) is a term often used in Microsoft systems, while UUID is the standard term.
Can I generate version 1 UUIDs?
This tool focuses on Version 4 (random) UUIDs, which are the most commonly used for general purposes. We do not currently support time-based V1 generation.
Is it safe to expose UUIDs in URLs?
Yes, UUIDs are designed to be public identifiers. However, because they are random, they are not sequential and cannot be easily guessed.
How many UUIDs can I generate at once?
You can set the quantity to generate multiple UUIDs in a batch, limited only by browser performance (typically thousands are fine).