Introduction

The page dimensions in a LaTeX document are highly configurable and the geometry package offers a simple way to change the length and layout of different elements such as the paper size, margins, footnote, header, orientation, etc.

Example

Suppose you need to create a document using A4-sized paper with a text area which shouldn't exceed 6 inches wide and 8 inches high. You can easily create such a document by including this line in your LaTeX preamble:

\usepackage[a4paper, total={6in, 8in}]{geometry}

The parameter values passed to the geometry package produce our required layout. In this case, a4paper establishes the desired A4 paper size and values supplied to the total parameter determine the size of the text area. Note that Overleaf uses a European LaTeX distribution, which produces documents in A4 size by default.

\documentclass{article}
\usepackage{blindtext}
\usepackage[a4paper, total={6in, 8in}]{geometry}

\begin{document}
\section{Introduction}
This is a test document which uses A4-sized paper and the user-defined text area. 
\subsection{Some dummy text}
\blindtext[8]

\end{document}

 Open this example in Overleaf

Paper size, orientation and margins

Modifying a document's paper size, orientation and margins is a common requirement which can easily be achieved using the geometry package. There are two ways to set the desired values:

• provide them them as parameters to the \usepackage statement as in the example above, or
• use the \geometry command in the preamble.

For example, let's create a document with legal paper size, landscape orientation and a 2 in margin:

\usepackage[legalpaper, landscape, margin=2in]{geometry}

You can achieve the same thing in a slightly different way:

\usepackage{geometry}
\geometry{legalpaper, landscape, margin=2in}

As you see, the parameters are comma separated. For a complete list of predefined paper sizes, see the reference guide. The second parameter is the orientation, its default value is portrait. Finally, each margin is set to 2in.

Fine tuning your LaTeX page dimensions

Visualizing the layout

The layout package provides a very convenient solution to visualizing the document's current layout—and the values of various LaTeX parameters which determine that layout. It provides two commands: layout and layout* which draw a graphic representing the current layout. The starred version (layout*) recalculates the internal values used to draw the graphic, which can be useful if you make changes to LaTeX's page-layout parameters. Here is an example:

\documentclass{article}
\usepackage{layout}
\begin{document}
\section{Default \LaTeX{} layout}
Here's the default layout:

\vspace{10pt}
\layout
\section{Make some changes}
Make changes to the margin paragraph settings and use the command \verb|layout*| to redraw the page layout diagram:
\vspace{10pt}
\setlength{\marginparwidth}{0pt}
\setlength{\marginparsep}{0pt}

\layout*
\end{document}

 Open this example in Overleaf to view the results!

The following image shows an example of the graphic produced by the layout package.

Using the geometry package layout parameters

The geometry package provides an interface to change page dimensions using intuitively-named parameters which need to be written in the form parameter=value, using standard LaTeX units (mm, cm, pt, in). The following list makes reference to the page-layout graphic provided in the previous section.

textwidth

Corresponds to element 8 in the graphic.

textheight

Element 7 in the graphic.

total

Depends on other parameters, by default defines the dimensions of the Body, but can be combined with the includehead, includefoot, includeheadfoot and includemp commands to change the dimensions of Header, the Body, the Footer and the Margin Notes altogether.

left, lmargin, inner

These three parameters change the length of the left margin. Elements 1 and 3 in the graphic, combined.

right, rmargin, outer

These three parameters change the length of the right margin. Elements 9 and 10 in the graphic, combined.

top, tmargin

These two parameters represent elements 2 and 6 in the graphic, combined.

bottom, bmargin

These two parameters set the distance from the bottom edge of the document to its baseline.

headheight

Height of the header

headsep

Separation between header (baseline) and text body. Element 6 in the graphic.

footnotesep

Separation between the bottom of text body (baseline) and the top of footnote text.

footskip

Distance separation between baseline of last line of text and baseline of footer.

marginparwidth, marginpar

Width of the margin notes. Element 10 in the graphic.

The paper size can be set to any size you need by means of the command papersize={⟨width⟩,⟨height⟩}.

Let's see an example with some of the aforementioned options:

\documentclass{article}
\usepackage{blindtext}
\usepackage{geometry}
 \geometry{
 a4paper,
 total={170mm,257mm},
 left=20mm,
 top=20mm,
 }
\begin{document}
\section{Some dummy text}
\blindtext[10]
\end{document}

 Open this example in Overleaf

This example produces the following output:

Here the text area, the left margin and the top margin are set. The right and bottom margins are automatically computed to fit the page.

Reference guide

Further reading

For more information see:

• Lengths in LaTeX
• Headers and footers
• Multiple columns
• Footnotes
• Page numbering
• Text alignment
• Hyperlinks
• Understanding packages and class files
• Writing your own package
• Writing your own class
• The geometry package documentation.