UUID / ULID decoder

Paste a UUID or ULID to inspect it. For UUIDs you get the version and variant; for v1/v7 UUIDs and ULIDs the embedded timestamp is extracted.

Paste a UUID or ULID to inspect it. For UUIDs you get the version and variant; for v1/v7 UUIDs and ULIDs the embedded timestamp is extracted.

How to use

  1. Paste a UUID or a ULID
  2. See whether it's a UUID or ULID
  3. For UUIDs, read the version and variant
  4. For v1/v7 and ULID, read the embedded timestamp

Frequently asked questions

Which UUID versions carry a timestamp?

Version 1 (60-bit gregorian time) and version 7 (48-bit Unix milliseconds). Versions 3, 4 and 5 have no embedded time.

What is a ULID?

A 26-character, lexicographically sortable identifier whose first 48 bits are a Unix-millisecond timestamp, encoded in Crockford base32.

Is anything sent to a server?

No — decoding is pure arithmetic in your browser.