UUID Generator
Generate UUIDs v4 and v7 in bulk
About the UUID Generator
This UUID generator creates version 4 (random) and version 7 (time-ordered) universally unique identifiers. UUID v4 uses 122 random bits, making collisions practically impossible. UUID v7 embeds a millisecond-precision timestamp in the first 48 bits, which makes UUIDs naturally sortable by creation time — useful for database primary keys.
Generate up to 100 UUIDs at a time in uppercase or lowercase. UUIDs are commonly used as primary keys in databases, unique filenames, session identifiers, API keys, and anywhere a unique identifier is needed without a central authority to assign it.
Frequently asked questions
Should I use v4 or v7?
v7 if the UUID will become a database primary key — its time-ordered prefix makes inserts sequential and indexes much smaller. v4 if you need maximum unpredictability or don't care about ordering.
Are collisions possible?
Mathematically yes, but the probability for v4 is so small (122 random bits = 5×10^36 possible values) that you'd need to generate billions per second for years before a collision became likely.