Generate one or many random version 4 UUIDs, ready to copy.
UUID Generator creates random version 4 UUIDs, the long unique identifiers software uses to label things without any two clashing. The problem it solves is naming at scale. When a program needs an ID for a record, a file, a session, or an event, a plain counter is fragile across many machines, but a random UUID is so vast in its range that two systems can each mint their own and safely assume they will never collide.
You generate one UUID or a batch of them, then copy the result straight into your code, a database seed, a config file, or wherever the identifier belongs. If you need several at once, you set the count and get a list ready to paste, which saves generating them one at a time.
A version 4 UUID is built almost entirely from random bits, with a couple of positions fixed to mark its version and variant, which is why you will always see a 4 in one spot and a limited set of characters in another. That randomness is the whole point, since it makes the odds of a duplicate vanishingly small in practice. It is worth remembering that a UUID is an identifier, not a secret, so it should label data rather than guard it.
Compared with an auto-incrementing number from a database, a UUID can be created anywhere without asking a central authority for the next value, which suits distributed systems and offline clients. When you specifically want short, ordered, human-friendly IDs, a sequence is still easier to read, so the choice depends on whether uniqueness across systems or readability matters more.
Developers use these to key database rows, to name uploaded files so they never overwrite each other, to tag API requests and sessions for tracing, and to seed test data. They also appear in message queues and event logs where every item needs its own stable handle.
Each UUID is generated in your browser using its randomness, so nothing is uploaded and no list of what you made is kept. There is no account and no cost. Your device is the only constraint, and since these are tiny strings, you can generate a long batch in an instant.
Version 4 UUIDs are generated from random data, as opposed to versions built from timestamps or hardware addresses. That is why you will always see the digit 4 in a fixed position, marking the version.
In theory yes, but the range of random values is so enormous that a collision is astronomically unlikely and safe to ignore in normal use. This is exactly why UUIDs are trusted as unique identifiers across independent systems.
Yes, you can set a count and produce a whole batch in one go, then copy the list. That is handy for seeding a database or filling out test fixtures.
No. A UUID is meant to identify things, not to be a secret, and it is not designed with the guarantees a security token needs. Use a dedicated random secret or token for anything that must stay confidential.
The version and variant of a version 4 UUID are encoded in fixed positions, so those few characters are constrained rather than fully random. Everything else in the string is random.
Yes, they are created in your browser and never uploaded, and no record of the values is kept. What you generate stays with you.
UUIDs are usually written in lowercase but are treated as the same value regardless of case in most systems. Check how your specific database or code compares them if case ever matters in your setup.
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