Free · No sign-up · Runs in your browser
UUID / GUID Generator
Generate random version 4 UUIDs in bulk for databases, APIs and tests — copy one or the whole list.
How it works
How to use the UUID Generator
- 1
Choose how many UUIDs you need (up to 100).
- 2
Pick the format — lowercase, UPPERCASE, with or without hyphens.
- 3
Click Generate and copy one UUID or the whole list.
FAQ
Frequently asked questions
What is a UUID?
A UUID (Universally Unique Identifier), also called a GUID, is a 128-bit ID such as 3f2b8c1e-9d4a-4f6b-a1c2-7e5d9f0b3a61. They are used as database keys, request IDs and file names.
Which UUID version does this create?
Version 4 — fully random UUIDs generated with your browser’s crypto.randomUUID(), the standard choice for most applications.
Can two UUIDs ever be the same?
In theory yes, but the chance is so small it is ignored in practice: you would need to generate billions of UUIDs per second for many years to expect one collision.