UUID Validator

How to use

1. 1Pick Single UUID to inspect one identifier in detail, or Batch to validate a list of UUIDs one per line.
2. 2Paste a UUID. Curly braces ({...}), the urn:uuid: prefix, contiguous 32-hex strings, and upper or lower case letters are all accepted.
3. 3Read the badges at the top for validity, version, and variant. The detail panel shows the canonical form, hex, URN form, byte breakdown, and (when applicable) decoded timestamp, clock sequence, and node.
4. 4For v1, v6, and v7 UUIDs, copy the ISO 8601 timestamp or the Unix millisecond value directly from the details list.
5. 5In Batch mode, the summary counts valid and invalid lines and Copy results as CSV exports input, status, version, canonical, and timestamp columns.

About this tool

UUID Validator parses any UUID or GUID and tells you whether it is well-formed, which version (1 through 8) it is, which variant it belongs to (NCS, RFC 4122 / RFC 9562, Microsoft, or reserved), and decodes the embedded data when the layout carries it. For v1 and v6 it extracts the 100-nanosecond Gregorian timestamp, converts it to an ISO 8601 UTC string and a Unix millisecond value, recovers the 14-bit clock sequence, and formats the 48-bit node as a colon-separated MAC address with a note about whether the multicast bit indicates a randomly generated node ID. For v7 it reads the leading 48-bit Unix millisecond timestamp and shows the human readable date. The parser accepts the canonical 8-4-4-4-12 hyphenated form, the Microsoft braced GUID form ({...}), the RFC 4122 URN form (urn:uuid:...), and a contiguous 32-character hex string with no hyphens, in upper or lower case. The Nil UUID (all zeros) and Max UUID (all ones, added in RFC 9562) are detected and labeled separately so you do not mistake a placeholder for a real identifier. A batch mode validates one UUID per line, summarizes how many are valid and invalid, and exports the results as CSV for spreadsheets or scripts. Useful when debugging an API response, verifying a database primary key, sanity checking a migration that mixes v1 and v7 IDs, identifying which library generated an unfamiliar UUID, or learning the RFC 4122 layout. All parsing runs locally on your device; the UUIDs you paste here never leave the browser.

Free to use. Works in your browser. No signup, no login.