UUID Generator
Generate random UUID v4s securely with Web Crypto — all in your browser.
Generated in your browser — nothing is sent.
About this tool
The UUID Generator lets you quickly produce random version 4 UUIDs — one at a time or many in a single batch — with handy copy buttons. It is built for developers who need unique identifiers for database records, API keys, or file names that must never clash.
A UUID v4 is a 128-bit identifier built mainly from random data, which makes the chance of two values colliding so tiny that they are considered unique for all practical purposes. The big advantage is that you can mint an id yourself without asking a central database to hand out numbers, which is especially convenient in distributed systems.
Here is what this uuid generator can do:
- Set how many to create in one go, saving time when you need several values
- Copy individually or all at once to paste into code or data files
- Produce a brand-new set instantly with a single click
If you have heard the term guid, that is simply Microsoft's name for a UUID, with exactly the same format. This generate uuid tool runs entirely in your browser, the values it creates are never sent anywhere, it is free, requires no account, and lets you generate an unlimited number.
How to use
- 1Choose how many UUIDs you want to generate at once
- 2Click generate and random UUID v4s are produced for the count you set
- 3Copy a single UUID, or copy the whole batch together
- 4Generate again any time you need a fresh set
Frequently asked questions
- What is a UUID v4?
- A UUID v4 is a 128-bit, randomly generated identifier whose chance of collision is so small it is treated as unique in practice. It is widely used as a record id in databases and APIs.
- Is a UUID the same as a GUID?
- In practice, yes. GUID is the name Microsoft uses for a UUID — the format and usage are identical.
- Can two generated UUIDs ever collide?
- In theory it is possible, but it is so unlikely it never happens in real use, because the value carries about 122 bits of randomness.
- Are the UUIDs truly random, and is this private?
- They are created using the browser's randomness and everything runs on your device, so no value is ever sent to a server.
- Is it free, and do I need to sign up?
- It is completely free with no signup, and you can generate as many as you like.