UUID Generator
Generate random version-4 UUIDs, one or many at a time, using your browser's cryptographic random source.
private This tool runs entirely in your
browser. Nothing you enter is sent to our server or anyone else.
When to use a UUID
A version-4 UUID is 122 random bits — enough that collisions are effectively impossible — so you can generate identifiers on any machine without coordinating with a central database. That makes them ideal for primary keys in distributed systems, idempotency keys and correlation IDs. These are generated with crypto.getRandomValues, so they are suitable for real use, not just examples.