UUID / GUID Generator
Cryptographically random UUIDs (GUIDs), configured exactly how you need them. Click any value to copy it — copied ones stay marked so you never lose your place.
What is a UUID (GUID)?
A UUID (Universally Unique Identifier) — called a GUID on Microsoft platforms — is a 128-bit value used to label something uniquely without needing a central authority to hand out IDs. They're everywhere in software: database primary keys, API request IDs, file names, distributed-system identifiers and more.
The odds of two randomly generated v4 UUIDs colliding are so small they're treated as effectively zero, which is what makes them so useful across independent systems.
v4 vs v7 — which should I use?
Version 4 is fully random. It's the classic, most widely supported choice and great when you just need a unique value.
Version 7 embeds a Unix millisecond timestamp in the leading bits, so the identifiers sort in roughly chronological order. That makes them far friendlier as database keys — inserts stay sequential and indexes don't fragment the way random v4 keys can.
Are these UUIDs secure?
Yes. They're generated using crypto.getRandomValues, the browser's cryptographically secure random number generator — the same source used for cryptographic keys. Crucially, generation happens entirely on your device. No identifier is ever requested from, sent to, or logged by a server, so you can safely use them for anything.
Frequently asked questions
Is there a limit on how many I can generate?
You can generate up to 500 at once here. There's no daily limit — it all runs locally.
Can I get them without hyphens or in uppercase?
Yes — use the case toggle and the "Include hyphens" / "Wrap in braces" options. Your choices update the output instantly.
How does the "copied" tracking work?
Click any UUID (or its copy button) to copy it. That row gets a green check and stays marked, and the counter at the top shows how many you've copied — handy when pasting a batch into different places.
Do you store the UUIDs I generate?
No. Nothing is sent anywhere. Generation happens in your browser tab and the values exist only on your screen.