UUID Generator

A UUID (universally unique identifier) is a 128-bit value, usually written as 32 hexadecimal digits in five dash-separated groups. It is unique enough that you can mint one anywhere without checking a central registry, which is why UUIDs are used for database keys, request IDs, and file names.

Version 4, the random kind. It uses your browser's built-in secure random source (crypto.randomUUID), so 122 of the 128 bits are random and the rest are fixed version and variant markers. Generate one at a time or up to fifty at once.

In theory yes, because they are random rather than coordinated, but in practice the odds are astronomically small. You would need to generate billions of UUIDs before a collision became remotely likely, so for real applications they are treated as unique.

Version 4 is fully random, so values land all over the place. Version 7 embeds a timestamp, so IDs sort roughly in creation order, which is friendlier to database indexes. This tool generates v4, which is the right default unless you specifically want time-ordered keys.

Yes. They are created by your browser's random source, not on a server, so the values are yours alone and nothing is transmitted.