What is UUID Generator?
Create version 4 UUIDs — random 128-bit identifiers used as database keys, request IDs and file names. Generate one or up to a hundred at a time, produced with your browser’s cryptographically secure randomness.
How to use UUID Generator
- Use the slider to choose how many UUIDs you need.
- Click Generate.
- Copy them all with a single click.
Why use this tool?
Cryptographically random
Generated with crypto.randomUUID, the browser’s secure source, rather than a weak pseudo-random algorithm.
Bulk generation
Producing up to 100 at once is useful for seeding test data or pre-allocating identifiers.
Frequently asked questions
Can two UUIDs ever collide?
In practice, no. A v4 UUID has 122 random bits — you would need to generate billions per second for many years before a collision became remotely likely.
What is the difference between UUID v1 and v4?
v1 is derived from timestamp and MAC address, which can leak information about when and where it was made. v4 is fully random, which is why it is the usual default.