UUID Generator
Random version-4 UUIDs generated with your browser's secure random source.
What is a version-4 UUID?
A UUID (universally unique identifier) is a 128-bit value written as 36 characters. Version 4 fills 122 of those bits with random data — enough that you can generate billions of them with no realistic chance of a collision, which is why they're the default choice for database keys, request IDs and file names in distributed systems.
Frequently asked questions
Are these UUIDs really unique?
The probability of two random v4 UUIDs colliding is about 1 in 5.3 undecillion. For practical purposes — database keys, filenames, tokens — they can be treated as unique.
Are the UUIDs generated on a server?
No, they come from your browser's cryptographically secure random generator, so they never travel over the network.