UUID v4 generator
Generate unique identifiers with cryptographic randomness, one or many at a time. In the browser, no data sent.
Genuinely free. No sign-up, no email, no limits, no cookies. We don't store the URL you analyse.
v4: random, the most common standard.
Press «Generate» to create one or more UUID.
What this tool cannot see
UUIDs are created in your browser with crypto.randomUUID and aren't logged. A UUID is an identifier, not a secret: don't use it as a security token.
What it's for
UUIDs (Universally Unique Identifiers) uniquely identify records, entities and resources with no central coordination: database keys, message ids, correlations across systems. Version 4, the random one, is the most used precisely because it needs no registry.
Alongside the other developer tools: the hash generator, the JWT decoder and the Base64 converter.
Frequently asked questions
›What kind of UUID does it generate?
UUID version 4, based on random numbers. We use crypto.randomUUID, the browser's native function that draws from a cryptographic random number generator: the chance of collision is, in practice, nil.
›Are the UUIDs generated on your server?
No. They're created in your browser: they don't pass through any server and aren't logged. Every time you press «Generate» you get fresh, unique ones.
›Can I generate many at once?
Yes, up to 50 at a time, with a button to copy them all together (one per line) as well as copying a single one.