I found this latex template that has no font-size attribute, but the writing is just too small to be read. Hope you can help me figuring out how to change the font size, the template has a file called arxiv.sty that contains:
\NeedsTeXFormat{LaTeX2e}
\ProcessOptions\relax
% fonts
\renewcommand{\rmdefault}{ptm}
\renewcommand{\sfdefault}{phv}
% set page geometry
\usepackage[verbose=true,letterpaper]{geometry}
\AtBeginDocument{
\newgeometry{
textheight=9in,
textwidth=6.5in,
top=1in,
headheight=14pt,
headsep=25pt,
footskip=30pt
}
}
\widowpenalty=10000
\clubpenalty=10000
\flushbottom
\sloppy
\usepackage{fancyhdr}
\fancyhf{}
\pagestyle{fancy}
\renewcommand{\headrulewidth}{0pt}
\fancyheadoffset{0pt}
\rhead{\scshape \today}
\cfoot{\thepage}
%Handling Keywords
\def\keywordname{{\bfseries \emph Keywords}}%
\def\keywords#1{\par\addvspace\medskipamount{\rightskip=0pt plus1cm
\def\and{\ifhmode\unskip\nobreak\fi\ $\cdot$
}\noindent\keywordname\enspace\ignorespaces#1\par}}
% font sizes with reduced leading
\renewcommand{\normalsize}{%
\@setfontsize\normalsize\@xpt\@xipt
\abovedisplayskip 7\p@ \@plus 2\p@ \@minus 5\p@
\abovedisplayshortskip \z@ \@plus 3\p@
\belowdisplayskip \abovedisplayskip
\belowdisplayshortskip 4\p@ \@plus 3\p@ \@minus 3\p@
}
\normalsize
\renewcommand{\small}{%
\@setfontsize\small\@ixpt\@xpt
\abovedisplayskip 6\p@ \@plus 1.5\p@ \@minus 4\p@
\abovedisplayshortskip \z@ \@plus 2\p@
\belowdisplayskip \abovedisplayskip
\belowdisplayshortskip 3\p@ \@plus 2\p@ \@minus 2\p@
}
\renewcommand{\footnotesize}{\@setfontsize\footnotesize\@ixpt\@xpt}
\renewcommand{\scriptsize}{\@setfontsize\scriptsize\@viipt\@viiipt}
\renewcommand{\tiny}{\@setfontsize\tiny\@vipt\@viipt}
\renewcommand{\large}{\@setfontsize\large\@xiipt{14}}
\renewcommand{\Large}{\@setfontsize\Large\@xivpt{16}}
\renewcommand{\LARGE}{\@setfontsize\LARGE\@xviipt{20}}
\renewcommand{\huge}{\@setfontsize\huge\@xxpt{23}}
\renewcommand{\Huge}{\@setfontsize\Huge\@xxvpt{28}}
% sections with less space
\providecommand{\section}{}
\renewcommand{\section}{%
\@startsection{section}{1}{\z@}%
{-2.0ex \@plus -0.5ex \@minus -0.2ex}%
{ 1.5ex \@plus 0.3ex \@minus 0.2ex}%
{\large\bf\raggedright}%
}
\providecommand{\subsection}{}
\renewcommand{\subsection}{%
\@startsection{subsection}{2}{\z@}%
{-1.8ex \@plus -0.5ex \@minus -0.2ex}%
{ 0.8ex \@plus 0.2ex}%
{\normalsize\bf\raggedright}%
}
\providecommand{\subsubsection}{}
\renewcommand{\subsubsection}{%
\@startsection{subsubsection}{3}{\z@}%
{-1.5ex \@plus -0.5ex \@minus -0.2ex}%
{ 0.5ex \@plus 0.2ex}%
{\normalsize\bf\raggedright}%
}
\providecommand{\paragraph}{}
\renewcommand{\paragraph}{%
\@startsection{paragraph}{4}{\z@}%
{1.5ex \@plus 0.5ex \@minus 0.2ex}%
{-1em}%
{\normalsize\bf}%
}
\providecommand{\subparagraph}{}
\renewcommand{\subparagraph}{%
\@startsection{subparagraph}{5}{\z@}%
{1.5ex \@plus 0.5ex \@minus 0.2ex}%
{-1em}%
{\normalsize\bf}%
}
\providecommand{\subsubsubsection}{}
\renewcommand{\subsubsubsection}{%
\vskip5pt{\noindent\normalsize\rm\raggedright}%
}
% float placement
\renewcommand{\topfraction }{0.85}
\renewcommand{\bottomfraction }{0.4}
\renewcommand{\textfraction }{0.1}
\renewcommand{\floatpagefraction}{0.7}
\newlength{\@abovecaptionskip}\setlength{\@abovecaptionskip}{7\p@}
\newlength{\@belowcaptionskip}\setlength{\@belowcaptionskip}{\z@}
\setlength{\abovecaptionskip}{\@abovecaptionskip}
\setlength{\belowcaptionskip}{\@belowcaptionskip}
% swap above/belowcaptionskip lengths for tables
\renewenvironment{table}
{\setlength{\abovecaptionskip}{\@belowcaptionskip}%
\setlength{\belowcaptionskip}{\@abovecaptionskip}%
\@float{table}}
{\end@float}
% footnote formatting
\setlength{\footnotesep }{6.65\p@}
\setlength{\skip\footins}{9\p@ \@plus 4\p@ \@minus 2\p@}
\renewcommand{\footnoterule}{\kern-3\p@ \hrule width 12pc \kern 2.6\p@}
\setcounter{footnote}{0}
% paragraph formatting
\setlength{\parindent}{\z@}
\setlength{\parskip }{5.5\p@}
% list formatting
\setlength{\topsep }{4\p@ \@plus 1\p@ \@minus 2\p@}
\setlength{\partopsep }{1\p@ \@plus 0.5\p@ \@minus 0.5\p@}
\setlength{\itemsep }{2\p@ \@plus 1\p@ \@minus 0.5\p@}
\setlength{\parsep }{2\p@ \@plus 1\p@ \@minus 0.5\p@}
\setlength{\leftmargin }{3pc}
\setlength{\leftmargini }{\leftmargin}
\setlength{\leftmarginii }{2em}
\setlength{\leftmarginiii}{1.5em}
\setlength{\leftmarginiv }{1.0em}
\setlength{\leftmarginv }{0.5em}
\def\@listi {\leftmargin\leftmargini}
\def\@listii {\leftmargin\leftmarginii
\labelwidth\leftmarginii
\advance\labelwidth-\labelsep
\topsep 2\p@ \@plus 1\p@ \@minus 0.5\p@
\parsep 1\p@ \@plus 0.5\p@ \@minus 0.5\p@
\itemsep \parsep}
\def\@listiii{\leftmargin\leftmarginiii
\labelwidth\leftmarginiii
\advance\labelwidth-\labelsep
\topsep 1\p@ \@plus 0.5\p@ \@minus 0.5\p@
\parsep \z@
\partopsep 0.5\p@ \@plus 0\p@ \@minus 0.5\p@
\itemsep \topsep}
\def\@listiv {\leftmargin\leftmarginiv
\labelwidth\leftmarginiv
\advance\labelwidth-\labelsep}
\def\@listv {\leftmargin\leftmarginv
\labelwidth\leftmarginv
\advance\labelwidth-\labelsep}
\def\@listvi {\leftmargin\leftmarginvi
\labelwidth\leftmarginvi
\advance\labelwidth-\labelsep}
% create title
\providecommand{\maketitle}{}
\renewcommand{\maketitle}{%
\par
\begingroup
\renewcommand{\thefootnote}{\fnsymbol{footnote}}
% for perfect author name centering
\renewcommand{\@makefnmark}{\hbox to \z@{$^{\@thefnmark}$\hss}}
% The footnote-mark was overlapping the footnote-text,
% added the following to fix this problem (MK)
\long\def\@makefntext##1{%
\parindent 1em\noindent
\hbox to 1.8em{\hss $\m@th ^{\@thefnmark}$}##1
}
\thispagestyle{empty}
\@maketitle
\@thanks
%\@notice
\endgroup
\let\maketitle\relax
\let\thanks\relax
}
% rules for title box at top of first page
\newcommand{\@toptitlebar}{
\hrule height 2\p@
\vskip 0.25in
\vskip -\parskip%
}
\newcommand{\@bottomtitlebar}{
\vskip 0.29in
\vskip -\parskip
\hrule height 2\p@
\vskip 0.09in%
}
% create title (includes both anonymized and non-anonymized versions)
\providecommand{\@maketitle}{}
\renewcommand{\@maketitle}{%
\vbox{%
\hsize\textwidth
\linewidth\hsize
\vskip 0.1in
\@toptitlebar
\centering
{\LARGE\sc \@title\par}
\@bottomtitlebar
\textsc{}\\
\vskip 0.1in
\def\And{%
\end{tabular}\hfil\linebreak[0]\hfil%
\begin{tabular}[t]{c}\bf\rule{\z@}{24\p@}\ignorespaces%
}
\def\AND{%
\end{tabular}\hfil\linebreak[4]\hfil%
\begin{tabular}[t]{c}\bf\rule{\z@}{24\p@}\ignorespaces%
}
\begin{tabular}[t]{c}\bf\rule{\z@}{24\p@}\@author\end{tabular}%
\vskip 0.4in \@minus 0.1in \center{\today} \vskip 0.2in
}
}
% add conference notice to bottom of first page
\newcommand{\ftype@noticebox}{8}
\newcommand{\@notice}{%
% give a bit of extra room back to authors on first page
\enlargethispage{2\baselineskip}%
\@float{noticebox}[b]%
\footnotesize\@noticestring%
\end@float%
}
% abstract styling
\renewenvironment{abstract}
{
\centerline
{\large \bfseries \scshape Abstract}
\begin{quote}
}
{
\end{quote}
}
\endinput
and the template.tex file that contains the code below but no attributes telling about the font-size:
\documentclass{article}
\usepackage{float}
\usepackage{arxiv}
\usepackage{graphicx}
\usepackage[utf8]{inputenc} % allow utf-8 input
\usepackage[T1]{fontenc} % use 8-bit T1 fonts
\usepackage{hyperref} % hyperlinks
\usepackage{url} % simple URL typesetting
\usepackage{booktabs} % professional-quality tables
\usepackage{amsfonts} % blackboard math symbols
\usepackage{nicefrac} % compact symbols for 1/2, etc.
\usepackage{microtype} % microtypography
\usepackage{lipsum}
\title{
You can overwrite the font settings of the .sty file by loading size11.clo or size12.clo afterwards.
These files will create nice matching sets of font sizes, so that it not only changes the size of the formal text but also adjust other sizes like \large etc. to get an harmonic result.
\documentclass{article}
\usepackage{float}
\usepackage{arxiv}
\usepackage{graphicx}
\usepackage[utf8]{inputenc} % allow utf-8 input
\usepackage[T1]{fontenc} % use 8-bit T1 fonts
\usepackage{hyperref} % hyperlinks
\usepackage{url} % simple URL typesetting
\usepackage{booktabs} % professional-quality tables
\usepackage{amsfonts} % blackboard math symbols
\usepackage{nicefrac} % compact symbols for 1/2, etc.
\usepackage{microtype} % microtypography
\usepackage{lipsum}
\title{test}
\makeatletter
%\input{size11.clo}
\input{size12.clo}
\makeatother
\begin{document}
\lipsum
\end{document}