# [Tex/LaTex] Applying options to already loaded package

package-optionspackages

Is there a way to apply some options to a package which is loaded in the cls file I am using? For instance, suppose that the cls file loads graphicx, and I want to apply the option demo to it from my tex file.

#### Best Answer

If a package is loaded, the option setting code in the package is already processed and gone. Thus in general you cannot change package options later.

## \PassOptionsToPackage

But you can specify options earlier, before loading the package. Apart from a global option (with side effects for other packages) \PassOptionsToPackage can be even used before \documentclass, e.g.:

\PassOptionsToPackage{demo}{graphicx}
\documentclass{article}
\usepackage{graphicx}

\begin{document}
\includegraphics{foobar}
\end{document}


## Package interface for loading options

Sometimes a package or class allows the setting of a subset of options later. For example, package hyperref provides \hypersetup. Also some options of package graphicx (or rather for \includegraphics) can be set via:

\setkeys{Gin}{<options>}


However, the option demo is not supported this way.