latex change font size code example

Example 1: latex text size

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

Example 2: latex font sizes

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

Example 3: latex font sizes

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

Example 4: latex change size of text

%Article
\documentclass[9pt]{extarticle}
%Report
\documentclass[14pt]{extreport}