\documentclass[a4paper]{article}
\usepackage{lmodern}
\usepackage{amssymb,amsmath}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{hyperref}
\begin{document}
\thispagestyle{empty}

{\tiny         Wenn}
{\footnotesize du}
{\small        das}
{\normalsize   lesen}
{\large        kannst,}
{\Large        brauchst}
{\LARGE        du}
{\huge         keine}
{\Huge         Brille.}

\end{document}