UUID Generator
Generate random UUID v4 identifiers instantly in your browser. Create one or thousands at once, then copy them with a single click.
How to use the UUID Generator
- Choose how many. Set the number of UUIDs you need, from 1 up to 1,000.
- Pick a format. Switch to uppercase or strip the hyphens if your system expects a different shape.
- Copy. Copy the whole list to your clipboard with one click.
Frequently asked questions
- What is a UUID?
- A UUID is a 128-bit identifier designed to be unique without any central authority handing out numbers. Version 4 UUIDs get that uniqueness from randomness rather than from a timestamp or a machine address.
- Are these UUIDs generated on your server?
- No. They are generated locally by your browser using the Web Crypto API. Nothing is sent over the network, so no identifier you see here ever leaves your device.
- How likely is a UUID v4 collision?
- A version 4 UUID has 122 random bits. You would need to generate billions of UUIDs per second for a century before a collision became likely, which is why they are safe to create independently on many machines at once.
- Can I use a UUID as a database primary key?
- Yes, and it is common practice when identifiers must be created by clients or across several services. Be aware that random UUIDs scatter writes across a B-tree index, so high-write tables sometimes prefer a time-sortable identifier instead.
Learn more
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