Question 1

What is a UUID?

Accepted Answer

A UUID (Universally Unique Identifier), also called a GUID, is a 128-bit value used to uniquely identify records, objects, and entities without a central authority.

Question 2

Which UUID version should I use?

Accepted Answer

v4 (random) is the most common general-purpose choice. v7 is time-ordered and great for database keys. v1 is time-based with a node component.

Question 3

Are the UUIDs truly unique?

Accepted Answer

v4 UUIDs are random with 122 bits of entropy, making collisions astronomically unlikely. v7 combines a timestamp with randomness for ordering plus uniqueness.

Question 4

Are they generated securely?

Accepted Answer

Yes. Random values come from the browser's cryptographically secure Web Crypto API, all locally on your device.

Question 5

Can I generate many at once?

Accepted Answer

Yes. Set the count to generate UUIDs in bulk, then copy them all or download them as a text file.

UUIDGenerator

UUID
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