UUID Generator
v4 UUIDs, as many as you need.
Loading tool
Click for a new id, or emit a column of them for fixtures. Version 4 uses cryptographic randomness.
How to use this tool
- Paste the snippet. Drop JSON, code, or a token into the input. It is not sent to a server.
- Run the action. Format, decode, or generate. Parse errors stay on the page.
- Copy the output. Copy the result back into your editor or terminal.
Versions
v4 is random. A nil UUID is available as a constant. v1 time-based ids are not generated, to avoid leaking a MAC-like node.
Frequently asked
Are these unique worldwide?
Collision chance is negligible for normal use. They are not registered anywhere.
Can I get uppercase?
Yes. RFC text is lowercase; some databases prefer upper.
Is v7 supported?
Not on this page.
How many can I generate at once?
Up to 500 per click so the page stays responsive.
Are ids logged?
No.