UUID Validator
Check whether a string is a validly-formatted UUID, and identify its version.
Confirming a UUID is well-formed
A UUID has a strict format — thirty-two hexadecimal digits in a specific hyphenated pattern — and it is easy for one to arrive malformed: a wrong length, an invalid character, a missing hyphen. This checks whether a string is a valid UUID and identifies which version it is, so you can validate an identifier before relying on it.
Paste a string and it reports whether it is a valid UUID.
Format, version and what it means
Beyond a yes-or-no on the format, knowing the version tells you something about the UUID: a version 4 is random, a version 1 is time-based, and the newer time-ordered versions have their own markers. Validating format is a useful guard for input — rejecting a malformed identifier early beats letting it cause a confusing failure later. As with any format check, though, valid format means well-formed, not that the UUID actually exists in your system; it confirms the shape, not the reference.
Common questions
What makes a UUID valid?
The correct length and hyphenated pattern of hexadecimal digits, with valid version and variant markers.
Does it tell me the UUID version?
Yes — it identifies the version, such as random version 4 or time-based version 1.
Is anything uploaded?
No. The check happens in your browser.