Generate random UUIDs (GUIDs) instantly
This UUID generator creates random version-4 UUIDs, also called GUIDs, in one click. Generate a single ID or a batch of up to 50, choose whether to include hyphens, and switch to uppercase if your system expects it. Every ID is generated locally in your browser, so nothing is stored or sent anywhere.
What is a UUID?
A UUID (Universally Unique Identifier), known as a GUID in Microsoft systems, is a 128-bit value written as 32 hexadecimal characters in five groups, like 550e8400-e29b-41d4-a716-446655440000. Version-4 UUIDs are random, which makes collisions astronomically unlikely, so you can use them as database keys, request IDs, or file names without a central authority handing them out.
Frequently asked questions
What is the difference between a UUID and a GUID?
None in practice. GUID is Microsoft's name for the same 128-bit identifier that the rest of the world calls a UUID. This tool generates both.
Are these UUIDs unique?
Version-4 UUIDs are random 128-bit values, so the chance of two ever colliding is vanishingly small. For everyday use they are effectively unique.
How do I generate multiple UUIDs at once?
Drag the "How many" slider up to 50 and the tool generates that many at once, one per line, ready to copy together.
Are the UUIDs generated privately?
Yes. They are created in your browser using the built-in crypto generator and never leave your device.