UUID Generator 🔒 Your data never leaves your browser.

Generate UUID v4 — single or in bulk, with formatting options.

Count UPPERCASE No hyphens

About this tool

A UUID v4 (Universally Unique Identifier) is a random 128-bit identifier in the form xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx, with a practically zero chance of collision — used for database keys, session IDs, file names and more. In .NET it is commonly called a GUID.

This tool uses crypto.randomUUID() — the browser's built-in secure crypto API — so generated UUIDs are cryptographically random, and of course they never leave your machine.