UUID Generator
Generate version-4 UUIDs with your browser's cryptographic random number generator — up to 100 at a time.
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit label like 3f8a2c1e-9b4d-4e7a-a1b2-c3d4e5f60718. Version 4 UUIDs are generated from random numbers: with 122 random bits, the chance of two colliding is so small that you can treat every generated UUID as globally unique without checking any central registry. That is why they are the standard for database primary keys, distributed systems, file names and API request IDs.
Frequently asked questions
How random are these UUIDs?
They are built with crypto.randomUUID(), your browser's cryptographically secure generator — the same quality of randomness used to generate encryption keys.
Can someone guess a UUID I generated?
Practically no. A v4 UUID has 5.3 × 10³⁶ possibilities; guessing a specific one is harder than winning every lottery on Earth, repeatedly.