UUID validator (version and variant)
Check that a UUID is valid and detect its version (v1/v3/v4/v5) and variant, in your browser.
🔒 100% client-side — no data sent
Check whether a UUID is valid and discover its version (v1, v3, v4 or v5) along with its variant. Validation runs 100% in your browser, with no data sent anywhere.
What is it for?
- ▸ Confirm that an identifier received from an API is a valid UUID
- ▸ Identify a UUID's version to understand how it was generated
- ▸ Debug a UUID format rejected by a database
- ▸ Validate identifiers before inserting them into a system
FAQ
How do I know a UUID's version?
The version is encoded in the first character of the third group. The tool detects it automatically (v1, v3, v4 or v5).
What is the difference between v4 and v1?
A v4 UUID is essentially random, whereas a v1 is based on a timestamp and the machine's MAC address.
What is a UUID's variant?
The variant indicates the bit layout and the standard followed. Most modern UUIDs use the RFC 4122 variant.