UUID Generator
Generate cryptographically random UUID v4 identifiers, individually or in bulk.
How to use the UUID Generator
- Choose how many UUIDs you want (1-100).
- Click Generate.
- Copy a single UUID or all of them at once.
How it works
A UUID v4 is a 128-bit identifier written as 32 hex digits in the form 8-4-4-4-12, e.g. f47ac10b-58cc-4372-a567-0e02b2c3d479. The "4" in the third group marks the version, and 122 of the 128 bits are random — so the odds of two generated UUIDs colliding are astronomically small, which is why they're commonly used as database primary keys or unique request IDs without checking a central registry.
Frequently asked questions
Are these UUIDs guaranteed to be unique?
Not mathematically guaranteed, but the collision probability is negligible — generating a billion UUID v4s per second for 100 years gives roughly a 50% chance of a single collision.
Is this generated securely?
Yes — it uses crypto.randomUUID() (or the Web Crypto API's getRandomValues() as a fallback), a cryptographically secure random source, entirely in your browser.