UUID Generator
Create one or many version 4 UUIDs locally with Web Crypto.
Choose a quantity and generate.
UUID v4 notes
Version 4 UUIDs are 128-bit identifiers with random bits and fixed version/variant bits. Collision risk is extremely low, but UUIDs are identifiers—not passwords, access tokens, or proof of authenticity.
Generation is processed in your browser. Analytics and advertising may receive ordinary usage and device data.
FAQ
Are UUIDs guaranteed unique?
No random identifier can offer an absolute guarantee, though correct UUID v4 collisions are extraordinarily unlikely.
Are UUIDs secret?
No. Treat them as public identifiers unless another security system protects the associated resource.
Reviewed: 2026-08-09