UUID Generator
Generate random v4 or time-ordered v7 UUIDs in bulk.
About this tool
A UUID is a 128-bit identifier that is practically unique without needing a central authority. Generate up to a thousand at once as version 4 (fully random) or version 7 (starts with a timestamp, so database indexes stay efficient). Format them as uppercase, without hyphens or wrapped in braces.
How to use it
- Choose v4 or v7 and how many you need.
- Pick formatting options.
- Click Generate and copy the list.
Frequently asked questions
What is the difference between v4 and v7?
v4 is entirely random. v7 begins with a millisecond timestamp, so values sort by creation time, which suits database primary keys.
Can two UUIDs collide?
The chance is so small it is ignored in practice. A v4 UUID has 122 random bits.
Are they cryptographically random?
Yes, they use your browser's secure random generator.