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I'm writing a paper that requires the section titles to be in 12pt font, I can get the title to be in 12pt using:

\section{\fontsize{12}{15}\selectfont Introduction}

but the section number does not change size, is there a way to do this?

I've also tried looking at titlesec but have not been able to find any suitable examples.

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Here's one possibility using the sectsty package:

\documentclass{article}
\usepackage{sectsty}

\sectionfont{\fontsize{12}{15}\selectfont}

\begin{document}

\section{Test Section}
test

\end{document}

The titlesec package could also be used:

\documentclass{article}
\usepackage{titlesec}

\titleformat{\section}
  {\normalfont\fontsize{12}{15}\bfseries}{\thesection}{1em}{}

\begin{document}

\section{Test Section}
test

\end{document}

enter image description here

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  • 2
    This is helpful to see how to set the font size to a specified pt size.
    – Steven C. Howell
    Commented Jun 2, 2015 at 13:38
  • 4
    Note, if you do the same thing (with the titlesec package) for a subsection, then replace \thesection with \thesubsection.
    – stack-delay
    Commented Nov 19, 2018 at 17:36
  • 1
    The titlesec solution seems to work for sections and subsections, but not for parts and chapters in the book class. And my editor wants 13pt for the part title. Is there a solution for this with titlesec?
    – Simon
    Commented Aug 11, 2019 at 20:22
  • 4
    Would it be possilbe to edit this answer to clarify what the arguments {12}{15} mean for the \fontsize command? Why are there two sizes? What do each mean? Under what scenarios would changing the first/second number be expected to change the actual font size?
    – MRule
    Commented Sep 9, 2021 at 15:10
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    Smauel Saari, that is not right. @MRule, the sintax is \fontsize{<size>}{<line space>}. See LatexFonts at wikibooks.
    – Fabricio
    Commented Oct 13, 2021 at 22:07

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