This document describes the JPEG universal metadata box format (JUMBF), which provides a universal format to embed any type of metadata in any box-based JPEG file format. This document defines the syntax of the JUMBF box and the mechanism to assign specific content types. In particular, this document specifies XML, JSON, CBOR, Embedded File, codestream and UUID types. In addition, this document defines the syntax to reference or request the embedded metadata content within or outside the image.