Set how many UUIDs you want, pick a version and a separator, and click Generate. Version 4 UUIDs are random, version 7 are time-ordered (great as sortable database keys), and version 1 encode a timestamp and node. Generation uses the browser's cryptographic random source and runs entirely on your device.
No. UUIDs are generated locally in your browser with the Web Crypto API — nothing is uploaded, so it works offline and the values are never seen by anyone else.
A UUID (Universally Unique Identifier), also called a GUID, is a 128-bit value written as 32 hexadecimal digits in the form xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. It's designed to be unique across space and time without a central authority.
Use version 4 for general-purpose random identifiers — it's the most common. Use version 7 when you want IDs that sort by creation time (ideal for database primary keys). Version 1 is a legacy timestamp-based format; this tool uses a random node instead of your real MAC address for privacy.
For practical purposes, yes. Version 4 draws 122 random bits, so collisions are astronomically unlikely. Versions 7 and 1 combine a timestamp with random bits, so values generated even in the same instant are still distinct.