UUID Generator

Generate batches of RFC 4122 version 4 UUIDs using the browser crypto API.

How to use

Choose how many identifiers you need, optionally switch to uppercase or drop the hyphens, then press Generate. Every value comes from crypto.getRandomValues with the version and variant bits set correctly.

FAQ

These are version 4 random identifiers, so they carry no timestamp and leak nothing about when or where they were made. Duplicates are re-rolled inside a batch, though at 122 random bits the chance is negligible.

Privacy: every calculation runs inside your browser. Your files and text never leave your device.