UUID Generator

A UUID (universally unique identifier) is a 128-bit value written as 36 characters — 8-4-4-4-12 hex digits, like 550e8400-e29b-41d4-a716-446655440000 — designed so that anyone can generate identifiers anywhere, with no central registry, and never collide. They're the default primary key in distributed systems, the correlation ID in logs, the idempotency key in payment APIs, the device or session identifier in analytics — anywhere two systems must mint IDs independently and merge them later without conflict.

This generator produces version 4 UUIDs, the purely random variant, using the browser's cryptographically secure crypto.randomUUID(). The randomness is what delivers the guarantee: a v4 UUID carries 122 random bits, so the chance of two ever colliding is so small that you'd need to generate a billion UUIDs per second for decades to reach even a remote probability of one duplicate. In practice: generate freely, don't check.

Ask for one or up to a hundred at a time — one per line, ready to copy into code, a database seed script, a spreadsheet of test data, or to download as a text file. Generation is local to your browser; nothing is logged, so the IDs you take from here exist nowhere else. If you need deterministic, name-based identifiers (the same input always yielding the same UUID), that's version 5 territory — different tool, different trade-offs; for the everyday "give me an ID nobody else has", v4 is the answer.