latex font sizes
snippet in c

latex text size

user6196

\Huge
\huge
\LARGE
\Large
\large
\normalsize
\small
\footnotesize
\scriptsize
\tiny

latex font sizes

user5832

\Huge
\huge
\LARGE
\Large
\large
\normalsize (default)
\small
\footnotesize
\scriptsize
\tiny

latex font sizes

user6931

Change global font size:
\documentclass[12pt]{report}