UUID Generator
Random v4 UUIDs, one or a thousand at a time. Generated entirely on this device.
What this tool does
UUID Generator produces random version-4 UUIDs — the 36-character identifiers (`xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx`) used everywhere from database primary keys to API request IDs to file names that need to be unique without coordinating with anything else. Generate one at a time or a few hundred at once.
Pick how many you need and they're ready immediately — there's no input to provide, just a count.
How to use it
Set how many UUIDs you want with the slider, up to 1000 at a time. They appear below immediately, one per line. Change the count and they regenerate automatically, or press Generate again for a fresh batch at the same count.
Copy the list with one click, or download it as a text file.
Why nothing leaves your device
There's nothing here to protect in the way there is with, say, a JWT decoder — a UUID has no meaning until you assign one to something. But some teams generate UUIDs for records that are themselves sensitive (a batch of IDs for an unreleased feature, an internal system's naming scheme), and there's still no reason a random-number generator needs a server round trip.
Generation uses `crypto.randomUUID()`, part of the Web Crypto API built into the browser — a cryptographically secure random source, not `Math.random()`. Nothing is sent anywhere, and nothing about what you generated is kept once you leave the page.
What this does well — and what it doesn't
This generates standard, correctly-formatted version-4 (random) UUIDs using a cryptographically secure random source, which is what you want for practically any use case that needs a UUID at all.
It only generates version 4 (random) UUIDs — not version 1 (timestamp-based), version 5 (name-based/deterministic), or other variants, since those need extra inputs (a namespace, a MAC address) that a general-purpose generator like this one doesn't collect. If your system specifically requires one of those other versions, this isn't the right tool for that ID.