New UUID
About this UUID generator
UUID stands for Universally Unique Identifier. It is a 128-bit id written with 32 hexadecimal characters: the digits 0–9 and the letters a–f. The usual form splits them into five groups of 8-4-4-4-12 characters, for example 3f6c2a91-8b4e-4c2d-9a1f-0e7b5d4c3a21.
This generator makes UUID version 4. Most of its characters come from the browser's secure random generator; a few fixed bits mark the UUID version and format. Version 4 is useful when a database, API, uploaded file or request needs an id that can be created without asking one central counter for the next number.
Lowercase, uppercase and a version without hyphens are only different ways to write the same id. A UUID is not a password, secret or proof of identity. If a duplicate would be critical, the system storing the records should still enforce a unique field.
Generation happens in this tab through the Web Crypto API. The UUIDs are not uploaded or saved by QwHub.
How it can look
A standard UUID v4 has 32 hexadecimal characters. Hyphens and letter case change only how it is written, not the underlying value.
| Choice | Notes |
|---|---|
| With hyphens | The usual look: 8-4-4-4-12 groups |
| No hyphens | 32 letters and digits in a row |
| A–F in capitals | Same id, uppercase |
| Not a password | Just an id — anyone can make another |
How to make a UUID
- Choose how many: One is enough most of the time. You can ask for up to 20.
- Click New UUID: A fresh random id appears. Tick the boxes if you need no hyphens or capitals.
- Copy it: It stays in this tab. Nothing is sent to a server.
Frequently asked questions
Is anything uploaded or stored?
No. Your browser makes the UUID on this page. Close the tab and it is gone. There is no account and no copy on a server.
Is a UUID the same as a GUID?
Yes. GUID is the name Windows uses for the same kind of unique id. If a form asks for a GUID, a UUID from this page is what it wants.
Can two UUIDs be the same?
A collision is possible in theory but extraordinarily unlikely with correctly generated UUID v4 values. For important database records, keep a UNIQUE constraint as the final safeguard.
Is a UUID a password?
No. It is only an id, so two records do not clash. Do not use it as a password. Anyone can make another UUID on this page.