UUID Generator
Create one UUID or thousands for databases, tests and code — or check what an existing one is.
- Your data never leaves your device
- 100% free
- No sign-up
- Works offline after first load
How to generate UUIDs
- Choose a version and how many you need.
- Pick the format: case, hyphens, braces, quotes and separator.
- Copy one, copy all or download them.
About UUID Generator
Generate UUIDs / GUIDs.
Everything works in your browser, so it is instant and private, and your settings are remembered on this device.
Good for
- Database primary keys and test data
- Request and correlation IDs
- File names and unique identifiers
Tip: Prefer v7 over v4 for database keys — inserts stay fast because new IDs sort last.
Frequently asked questions
Which UUID version should I use?
v4 (random) for general IDs. v7 for database primary keys — it starts with a timestamp, so new rows are stored in order, which keeps indexes fast. v5 when the same input must always give the same UUID.
Are these UUIDs unique and secure?
v4 and v7 use your browser’s cryptographically secure random generator. The chance of two v4 UUIDs colliding is effectively zero.
What is the difference between a UUID and a GUID?
They are the same thing — GUID is Microsoft’s name. Turn on {Braces} and UPPERCASE for the classic GUID style.
Can it tell when a UUID was created?
Yes, for v1, v6 and v7 — paste it into Validate & decode to see the date and time, plus version and variant for any UUID.
Is my data uploaded?
No. Everything is processed by JavaScript in your browser — nothing you paste or open is sent to a server, so it is safe for API responses, tokens, configs and customer data. It also works offline once the page has loaded.