Beamer \institute text size change to small

I am using beamer with the \institute command.

I have several institutes and just want to change the font size of the institutes and not the whole document. I would like the institutes to be much smaller than the rest of the document.

Here is my code, but maybe I'm lost. Thanks for any input as I am new to beamer and LaTeX.

\institute[University of] {size=\fontsize{9pt}{10pt}\selectfont University of Utah}%
{
\inst{1}%
Department of Electrical and Computer Engineering\\
University of
\and
\inst{2}%
Department of Chemistry\\
University of
\and
\inst{3}%
Department of\\
University of
\and
\inst{4}%
Department of \\
University of
~ \\
\pgfuseimage{medallion}
}

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You can change the font size of beamer elements using \setbeamerfont{<element>}{<font attributes>}:

\documentclass{beamer}

\setbeamerfont{institute}{size=\tiny}

\institute[University of]{
\inst{1}%
Department of Electrical and Computer Engineering\\
University of
\and
\inst{2}%
Department of Chemistry\\
University of
\and
\inst{3}%
Department of\\
University of
\and
\inst{4}%
Department of \\
University of
~ \\
\pgfuseimage{example-image}
}

\begin{document}
\maketitle
\end{document}


If you want to use absolute font sizes instead of the LaTeX commands \tiny ... \Huge, try something like

\setbeamerfont{institute}{size=\fontsize{7pt}{8pt}}


(\selectfont is not necessary in this context). Also see the beamer manual for more information about \setbeamerfont.

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