This is what I want:

Chapter 1 : Introduction

but I always get:

Chapter 1


How do I do this?


If you use a KOMA-class you will not need the package titlesec:

\chapter{A chapter}
\section{A section}
  • with other classes, it is still possible to redefine the chapter look without using titlesec. – pluton Aug 6 '11 at 15:23
  • @pluton: Of course but the standard classes don't allow it in such an easy way :-). – Marco Daniel Aug 6 '11 at 15:46
  • I know tex.stackexchange.com is really nice place, Thanks Marco – Verly Aug 8 '11 at 4:30

You don't say which document class you are using, but for the standard classes, you can adjust these parameters easily with the titlesec package.

{\normalfont\huge\bfseries}{\chaptertitlename\ \thechapter:}{1em}{} 

\chapter{A chapter}
\section{A section}

output of code

You can change the font size as needed, and if you need to change the spacing, there is also a command for that.

  • If I am using scrbook, and I need the prefix to be CHAPTER \thechapter: Title on the same line without line break, how can I do it without loading titlesec? – Diaa Nov 29 '16 at 9:32
  • @DiaaAbidou see the other answer. scrbook is part of the KOMA classes. – Alan Munn Nov 29 '16 at 13:29
  • @AlanMunn Thanks for your response, but I had a problem when using this approach as shown in my question. – Diaa Nov 29 '16 at 13:31
  • How can one reduce the gap between chapter and section? – Adam Jun 9 '19 at 7:40
  • 1
    @Adam You can use \titlespacing*{\chapter}{<leftsep>}{<beforesep>}{<aftersep>}. So e.g. \titlespacing*{\chapter}{0pt}{0pt}{0pt} would reduce the space after the title to zero. For chapters, this only works if you have also used the \titleformat command to define the chapter format. – Alan Munn Jun 9 '19 at 14:48

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