# How can I change the font size of the authors and the affiliation in Latex?

I have something like this:

\documentclass[11pt,a4paper, twocolumn]{article} % 11pt for all the article
\begin{document}
\font\myfont=cmr12 at 16pt
\title{{\myfont MY TITLE}}%Title in 16pt
\author{MY NAME}% **I need it in 12pt**
\affil{University of...}% **I need it in 9pt**


How can the font sizes be changed?

• Welcome to TeX.SX! You can have a look at our starter guide to familiarize yourself further with our format – texenthusiast Aug 13 '13 at 15:08
• \font\myfont=cmr12 at 16pt is a plain TeX command, use \documentclass[16pt,...]{article} instead (This will automatically load the correct Computer Modern family). To change the font size in title and author use the corresponding factor inside the argument, like \title{\Huge The Title}. Don't set any absolute fontsizes by yourself (e.g. \font ... at 16pt), always use the relative sizes (e.g. \large). BTW: \affil isn't defined by article. – Henri Menke Aug 13 '13 at 15:19
• @HenriMenke \documentclass[16pt]{article} wont do anything, the valid options are 10pt, 11pt and 12pt. With extarticle you have more options, including 14pt and 17pt. – Torbjørn T. Aug 13 '13 at 15:25
• Thanks Henri, but I need 11pt for all the document, I just need to change the size of the title (16pt), the authors (12pt) and the affiliation (9pt). They are instructions from a journal, I thing I can't use \large or \Huge. – damb Aug 13 '13 at 15:28
• @TorbjørnT. You are right, of course. Please accept my apologies for not thinking before typing. – Henri Menke Aug 13 '13 at 15:38

You can get the exact font sizes you need in a proper way; the idea is to use \fontsize{}{}\selectfont and a scalable font allowing the desired sizes (lmodern, for example). authblk offers \Authfont and \Afillfont to customize font attributes for authors and affiliations; a simple patch to \@maketitle allows you to choose the exact desired font for the title:

\documentclass[11pt, a4paper, twocolumn]{article}
\usepackage[affil-it]{authblk}
\usepackage{etoolbox}
\usepackage{lmodern}

\makeatletter
\patchcmd{\@maketitle}{\LARGE \@title}{\fontsize{16}{19.2}\selectfont\@title}{}{}
\makeatother

\renewcommand\Authfont{\fontsize{12}{14.4}\selectfont}
\renewcommand\Affilfont{\fontsize{9}{10.8}\itshape}

\title{MY TITLE}
\author{MY NAME}
\affil{University of..}

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


Using the @Henrimenke recommendation, you can find it here

\documentclass[11pt, a4paper, twocolumn]{article} % 11pt for all the article
\usepackage[affil-it]{authblk}
\begin{document}
\title{\LARGE MY TITLE}          %Title in 16pt=15.84985
\author{\large MY NAME}            % I need it in 12pt=11.74988
\affil{\footnotesize University of..}   % I need it in 9pt=9.24994
\maketitle
\end{document}