Generate a unique identifier
Generate a universally unique identifier (UUID/GUID) online — instantly and for free. Pick the version, count and format, then copy the result with one click.
What is a UUID
A UUID is a 128-bit identifier that is practically guaranteed to be unique without a central registry. It is used for database keys, request and file IDs, session tokens and distributed systems. The generator supports versions v1, v3, v4, v5, v6, v7, v8 and Nil/Max, and runs entirely in your browser — values are never sent to a server.
Frequently asked questions
Which UUID version should I choose?
For most cases v4 (fully random) is the best choice — it is the default. v7 is great for database keys because it is time-ordered; v1/v6 are time-based, while v3/v5 are name-based (hashed). Nil and Max are special all-zero or all-one values.
What is the difference between UUID and GUID?
They are the same thing. GUID (Globally Unique Identifier) is the name used in the Microsoft ecosystem, while UUID is the RFC standard term. The format and purpose are identical.
Can two UUIDs ever collide?
The probability of a collision is so small it is considered negligible: a v4 UUID has 122 random bits. In practice UUIDs are treated as unique without any central registry.
Is it safe to generate UUIDs here?
Yes. All values are generated locally in your browser and are never sent to a server — we do not see or store them.
Is it free, and how many values can I generate at once?
The tool is completely free. You can generate up to 50 UUIDs at once and copy them in the format you need.
