# EPUBCheck OPF-018: The remote-resources property was…

Source: https://epublab.com/epubcheck/opf-018/ (updated 2026-11-03)

EPUBCheck OPF-018 is a warning message: “The "remote-resources" property was declared in the Package Document, but no reference to remote resources has been found.” A manifest item declares remote-resources, but EPUBCheck found no reference to a remote resource in it.

- Official message (EPUBCheck 5.4.0): The "remote-resources" property was declared in the Package Document, but no reference to remote resources has been found.
- Default severity: Warning

## Typical causes

- The remote image, font or media was removed or brought into the EPUB, but the property stayed.

## How to fix it

- Remove remote-resources from that manifest item.

Message text and severity: EPUBCheck (W3C, BSD-3-Clause). Explanation: EPUBLab.