UUID Generator
Local processing · never uploadedGenerate random UUID v4 and time-ordered v7 — in bulk, instantly.
What is UUID Generator?
UUID Generator creates universally unique identifiers — single or in bulk — right in your browser, with support for both v4 (random) and v7 (time-ordered).
A UUID (Universally Unique Identifier, also called GUID) is a 128-bit value used to label data without a central authority handing out IDs. They are everywhere: database primary keys, request and trace IDs, file names, API resources and distributed systems where two machines must never generate the same ID. A UUID looks like 550e8400-e29b-41d4-a716-446655440000.
Version 4 is fully random and the most widely used. Version 7 embeds a millisecond timestamp at the front, so the IDs sort in roughly the order they were created — which makes them far friendlier as database keys because inserts stay sequential and indexes stay compact. This tool generates either version, lets you produce up to a thousand at once, and offers uppercase and hyphen-free output for systems that need it.
All values are generated with your browser’s cryptographic random source. Nothing is requested from or sent to a server, so the IDs are yours alone.
FAQ
What is the difference between UUID v4 and v7?
v4 is completely random. v7 starts with a millisecond timestamp, so IDs are time-sortable — better as database keys because inserts stay ordered and indexes stay efficient. Both are unique in practice.
Are these UUIDs safe to use as IDs?
Yes. They use your browser’s cryptographically secure random source. The chance of a collision is negligible for any realistic number of IDs.
Can I generate many at once?
Yes, up to 1000 per click. You can copy them all with one button.
What are the uppercase and hyphen options for?
Some systems expect UUIDs in uppercase or without hyphens (a plain 32-character hex string). Toggle those options to match your target format.
Is a UUID guaranteed to be unique?
Not mathematically guaranteed, but the probability of a collision is so astronomically small that UUIDs are treated as unique in practice.