v1, v4, v5, and v7 UUIDs with format options, a built-in decoder, and local history — all instant, right in your browser.
Paste any UUID to check if it's valid and see its version, variant, and embedded timestamp (for v1/v7).
Saved only on this device (browser local storage) — never uploaded anywhere.
Built to replace the four or five separate UUID tools developers usually bounce between.
No. Every UUID is generated entirely client-side using the Web Crypto API. Nothing is sent to or stored on our servers.
v1 is timestamp and node based, v4 is fully random, v5 is deterministic and built from a namespace plus a name using SHA-1, and v7 is time-ordered — increasingly used for database keys since it sorts chronologically.
Practically yes. A v4 UUID has 122 random bits, making collisions astronomically unlikely even across trillions of generated IDs.
No. History is stored only in your browser's local storage on this device. Delete individual entries or clear everything at any time.
Yes — set the quantity field to generate up to 1000 UUIDs in one click, then copy or download them all together.
v5 produces the same UUID every time for the same namespace and name, which is useful when you need a reproducible, deterministic identifier rather than a random one.
All tools are free. If they've saved you time, consider supporting us.