Which version should I use?

Most ids are v4. Use v5 when the same name must keep the same value, and NIL for an empty slot.

Can I make more than 200?

One pass stops at 200. Press make again for another set.

No. A v5 name is hashed in this browser and is not uploaded.

Home UUID generator

Builds v4, v1, v5, and NIL in this browser. The values stay on the device.

Count

Test data should not require opening a console just to mint an id.

The same name always gives the same v5. DNS and www.example.com give 2ed6657d-e927-568b-95e1-2665a8aea6a2.

01How to use it

Pick a version and a count. The list appears at once. v5 also needs a namespace and a name.

Press a row to copy that id. Copy all joins them with line breaks.

Several v4 values come out as lowercase groups of 8-4-4-4-12.

NIL is the single value 00000000-0000-0000-0000-000000000000.

Enteredwww.example.com

v5 DNS	2ed6657d-e927-568b-95e1-2665a8aea6a2
NIL	00000000-0000-0000-0000-000000000000

03Worth knowing

A v4 uses 122 random bits. Ordinary test data does not collide.

A v1 mixes the time with a device-side random node, so the order of creation is roughly visible.

QWhich version should I use?: AMost ids are v4. Use v5 when the same name must keep the same value, and NIL for an empty slot.
QCan I make more than 200?: AOne pass stops at 200. Press make again for another set.
QDoes the name leave this device?: ANo. A v5 name is hashed in this browser and is not uploaded.

Version 4 is random, version 1 uses the time, and version 5 is built from a DNS, URL, OID, or X.500 name. Nil is all zeros.

Make up to 200 at once. Version 5 and nil have no count field. The same name and namespace always give the same version 5.

A file you choose, text you type, and a picture you make stay in this browser. They are not uploaded to Kitharu, and the result stays on this device.