The UUID Generator creates random universally unique identifiers (UUIDs, also called GUIDs) instantly. Choose how many you need, whether you want them uppercase, and whether to keep the hyphens, then copy them all in one click. These are version 4 UUIDs — the random type used most often in software.
Every UUID is generated locally using your browser’s cryptographically secure random generator, so they’re genuinely unpredictable and nothing is sent to a server.
How to generate a UUID
- Set how many UUIDs you want (up to 100).
- Optionally tick Uppercase or turn off Hyphens to match your format.
- Click Generate to create a fresh batch.
- Use “Copy all” to put every UUID on your clipboard.
What is a UUID?
A UUID is a 128-bit identifier written as 32 hexadecimal digits in five groups, like 550e8400-e29b-41d4-a716-446655440000. It’s designed to be unique across space and time without a central authority, which makes it ideal for database keys, request IDs, and file names.
Version 4 UUIDs are made from random numbers. With 122 random bits, the chance of two colliding is astronomically small, so you can generate them freely without coordination.
Common uses
- Primary keys and identifiers in databases and APIs.
- Correlation or request IDs for tracing and logging.
- Unique file names and idempotency keys.
- Any place you need an ID that won’t clash with others.
Frequently Asked Questions
What UUID version does this generate?
Version 4 (random) UUIDs, the most common type. They’re created from cryptographically secure random values in your browser.
Are these UUIDs really unique?
Effectively yes. A version 4 UUID has 122 random bits, so the probability of a collision is negligible even across billions of values.
What’s the difference between UUID and GUID?
They’re the same thing. GUID (Globally Unique Identifier) is Microsoft’s name for a UUID; the format is identical.
Are my UUIDs sent anywhere?
No. They’re generated entirely in your browser and never uploaded or logged.