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How can I change the font size of the footer in Beamer without modifying the font of the title (on the title page)? Also, when I try to change the title's font with \title{\fontsize{20}{25} My Title} it doesn't seem to work. Thank you.

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Do you want to change the font for all the elements in the footline of just fot the title in the footline? – Gonzalo Medina Aug 29 '11 at 11:38
@Gonzalo Medina How do I change the font for all the elements in the footline? Because for the title I followed Marco's advice and used \title[\fontsize{10}{15}\fontselect My Title]{etc}, which changes the font size for the title. – chimil Aug 29 '11 at 15:28
@Gonzalo Medina I think I figured it out: I just have to use instead of \title \author with the same type of argument. – chimil Aug 29 '11 at 15:35
up vote 4 down vote accepted

You need the command \selectfont after fontsize

\title[My Title]{ \fontsize{20}{25}\selectfont My Title} 
\frame{a frame}

Detailed information are documented in the Docmentation of LaTeX font commands

EDIT: Use the theme AnnArbor and the optional argument of \title.

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Thanks, Marco. It makes sense. But I still have no idea if it's possible to change separately the footer's font size. I use AnnArbor theme, and when I modify the size of the font, the footer is altered too and I get several Warnings and an Overfull \hbox. – chimil Aug 29 '11 at 11:05
Awesome! I don't get any errors now. Cheers! – chimil Aug 29 '11 at 11:15

You can change the font for all the elements in the footline simply by setting the footline font using


A little example:


\title[Short title]{Long}
\author[Short author]{Long}
\institute[Short inst.]{Long}





enter image description here

Of course, if the chosen font is too big, the results obtained won't be very pleasing (try using \fontsize{10}{12}\selectfont in my example code above). In this case, you will have to change the footline template. In the following example I made some changes in the spacing between the date and the page number and after the page number, to have a footline with a font size of 10pt:


\title[Short title]{Long title}
\author[Short author]{Long author}
\institute[Short inst.]{Long institute}

  \begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,center]{author in head/foot}%
    \usebeamerfont{author in head/foot}\insertshortauthor~~\beamer@ifempty{\insertshortinstitute}{}{(\insertshortinstitute)}
  \begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,center]{title in head/foot}%
    \usebeamerfont{title in head/foot}\insertshorttitle
  \begin{beamercolorbox}[wd=.333333\paperwidth,ht=2.25ex,dp=1ex,right]{date in head/foot}%
    \usebeamerfont{date in head/foot}\insertshortdate{}\hspace*{1em}% original: 2ex
    \insertframenumber{} / \inserttotalframenumber\hspace*{1ex}% original: 2ex




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Great! Thank you for your time and this useful tip. – chimil Aug 29 '11 at 18:12
Regarding \setbeamerfont{footline}{size=\fontsize{9}{11}\selectfont}, the first number (i.e. 9) changes the font size; what does the second number (11) make? – Marco Feb 6 at 20:59

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