Generate random (version 4) UUIDs directly in your browser. No timestamp or identifying data is embedded. Nothing is uploaded.
v4 is 122 bits of randomness — unpredictable, but scattered across a database index. v7 embeds a 48-bit millisecond timestamp in the high bits, so values created together sort together, which is friendlier to B-tree indexes.
A v4 UUID has 122 random bits; collisions are astronomically unlikely even at billions of IDs. v7 spends fewer bits on randomness but adds ordering, and is still effectively collision-free at realistic volumes.
v1 embeds a timestamp and a node identifier — generated here with a random, multicast-flagged node rather than a real MAC address, matching modern privacy guidance.