Generate v4 UUIDs in bulk, with formatting options. Free, runs entirely in your browser — your files are never uploaded.
How to use UUID Generator
Choose how many UUIDs you need.
Set the formatting — hyphens, case, and braces if you want them.
Copy the results.
Frequently asked questions
Are these random enough to rely on?
They come from the browser’s cryptographic random number generator, not from Math.random. A version 4 UUID has 122 random bits, so collisions are not a practical concern.
What is the difference between a UUID and a GUID?
Nothing meaningful. GUID is Microsoft’s name for the same 128-bit identifier, sometimes written in braces and uppercase, which is why those formatting options exist.
Can I generate a lot at once?
Yes — ask for a bulk batch and copy the whole list in one go.
Are the generated values sent anywhere?
No. They are produced in your browser and never leave it, so they are safe to use as real identifiers.