LaTeX Document Classes Guide: article, report, book, beamer

The \documentclass command tells LaTeX what kind of document you are writing. It controls the available structure, the default layout, and options such as font size, paper size, and one-sided or two-sided output.

Quick answer: use article for papers and assignments, report for reports and shorter theses, book for books and long dissertations, beamer for slides, and letter for formal letters.Basic syntax:

\documentclass[12pt,a4paper]{article}

Best next read: Page numbering for long documents and Multiple columns for journal-style layouts.

Which LaTeX Document Class Should You Use?

If you only need the short version:

If you are writing…	Use this class
Essay, assignment, journal paper	`article`
Lab report, project report, shorter thesis	`report`
Book, dissertation, long manual	`book`
Slides or a presentation deck	`beamer`
Formal letter	`letter`

The `\documentclass` Command

This is the basic syntax:

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\documentclass[options]{class}

class is the document class such as article, report, or book
options are optional settings such as font size, paper size, or one-sided vs two-sided layout

\documentclass[12pt,a4paper,twoside]{report}

Which Document Class Should You Use?

Class	Best for	Key difference
`article`	Essays, homework, journal papers	No `\chapter` command
`report`	Technical reports, shorter theses, project docs	Supports chapters
`book`	Books, dissertations, long manuals	Adds front matter and two-sided book layout
`beamer`	Slides and presentations	Uses frames instead of pages
`letter`	Formal letters	Purpose-built letter structure

Standard Document Classes

article

For short documents without chapters.

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\documentclass[options]{article}

% Best for:
% - Research papers
% - Journal articles
% - Reports (short)
% - Homework assignments
% - Essays

% Structure hierarchy:
% \section{}
% \subsection{}
% \subsubsection{}
% \paragraph{}
% \subparagraph{}

\begin{document}
\title{Article Title}
\author{Author Name}
\date{\today}
\maketitle

\begin{abstract}
Abstract content for articles.
\end{abstract}

\section{Introduction}
Article content starts here.

\section{Main Content}
More sections as needed.

\section{Conclusion}
Final thoughts.

\end{document}

Article Features:

No \chapter command
Abstract environment available
Compact formatting
Good for papers under 20-30 pages

report

For longer documents with chapters.

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\documentclass[options]{report}

% Best for:
% - Technical reports
% - Theses (shorter)
% - Project documentation
% - Lab reports
% - User manuals

% Structure hierarchy:
% \chapter{}
% \section{}
% \subsection{}
% \subsubsection{}
% \paragraph{}
% \subparagraph{}

\begin{document}
\title{Report Title}
\author{Author Name}
\date{\today}
\maketitle

\begin{abstract}
Abstract for reports.
\end{abstract}

\tableofcontents

\chapter{Introduction}
First chapter content.

\chapter{Methodology}
Second chapter content.

\chapter{Results}
Third chapter content.

\chapter{Conclusion}
Final chapter content.

\end{document}

Report Features:

\chapter command available
Abstract environment included
Separate title page by default
Good for documents 20-100 pages

book

For books and very long documents.

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\documentclass[options]{book}

% Best for:
% - Books
% - Long theses/dissertations
% - Textbooks
% - Multi-volume works
% - Complex documents

% Structure hierarchy:
% \part{}
% \chapter{}
% \section{}
% \subsection{}
% \subsubsection{}
% \paragraph{}
% \subparagraph{}

\begin{document}

\frontmatter  % Roman page numbers, no chapter numbers
\title{Book Title}
\author{Author Name}
\date{\today}
\maketitle

\tableofcontents
\listoffigures
\listoftables

\mainmatter   % Arabic page numbers, normal numbering
\part{First Part}

\chapter{Introduction}
Chapter content begins here.

\chapter{Background}
More content here.

\backmatter   % No chapter numbers
\appendix
\chapter{Additional Information}

\bibliographystyle{plain}
\bibliography{references}

\end{document}

Book Features:

Two-sided layout by default
Front matter, main matter, back matter
Parts and chapters available
Best for 100+ page documents

beamer

For presentations and slides.

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\documentclass[options]{beamer}

% Best for:
% - Conference presentations
% - Lecture slides
% - Academic talks
% - Business presentations

% Slide structure:
% \frame{} or \begin{frame}...\end{frame}
% \section{} for navigation
% \subsection{} for organization

\usetheme{Warsaw}  % Choose theme
\usecolortheme{dolphin}  % Choose colors

\title{Presentation Title}
\author{Author Name}
\institute{Institution}
\date{\today}

\begin{document}

\frame{\titlepage}

\begin{frame}
\frametitle{Outline}
\tableofcontents
\end{frame}

\section{Introduction}
\begin{frame}
\frametitle{Introduction}
\begin{itemize}
  \item First point
  \item Second point
  \item<2-> This appears on second click
\end{itemize}
\end{frame}

\section{Main Content}
\begin{frame}
\frametitle{Main Points}
Content of the slide here.
\end{frame}

\end{document}

Beamer Features:

Built-in themes and color schemes
Overlay specifications for animations
Navigation aids
PDF presentation format

letter

For correspondence.

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\documentclass[options]{letter}

% Best for:
% - Business letters
% - Formal correspondence
% - Cover letters
% - Official documents

\usepackage[utf8]{inputenc}

\signature{Your Name}
\address{Your Address\\City, State ZIP}

\begin{document}

\begin{letter}{Recipient Name\\Recipient Address\\City, State ZIP}

\opening{Dear Sir or Madam,}

Body of the letter goes here. Multiple paragraphs
are separated by blank lines.

This is the second paragraph of the letter.

\closing{Sincerely,}

\ps{P.S. Additional note here.}

\encl{Enclosure list}

\end{letter}
\end{document}

Letter Features:

Automatic formatting for addresses
Date insertion
Signature placement
Standard letter conventions

Document Class Options

Font Size Options

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% Available font sizes
\documentclass[10pt]{article}  % 10pt (default)
\documentclass[11pt]{article}  % 11pt
\documentclass[12pt]{article}  % 12pt

% Font size affects:
% - Body text size
% - Section heading sizes
% - Math formula sizes
% - Footnote sizes

Paper Size Options

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% US paper sizes
\documentclass[letterpaper]{article}  % 8.5 × 11 inches (default)
\documentclass[legalpaper]{article}   % 8.5 × 14 inches
\documentclass[executivepaper]{article} % 7.25 × 10.5 inches

% International paper sizes
\documentclass[a4paper]{article}      % 210 × 297 mm
\documentclass[a5paper]{article}      % 148 × 210 mm
\documentclass[b5paper]{article}      % 176 × 250 mm

% Custom paper size (with geometry package)
\usepackage[paperwidth=8in,paperheight=10in]{geometry}

Layout Options

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% Page orientation
\documentclass[landscape]{article}    % Landscape orientation
\documentclass[portrait]{article}     % Portrait (default)

% Columns
\documentclass[onecolumn]{article}    % Single column (default)
\documentclass[twocolumn]{article}    % Two columns

% Sides
\documentclass[oneside]{article}      % Single-sided (default for article)
\documentclass[twoside]{book}         % Double-sided (default for book)

% Draft mode
\documentclass[draft]{article}        % Shows overfull boxes, faster compilation
\documentclass[final]{article}        % Final mode (default)

Title Page Options

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% Title page behavior
\documentclass[titlepage]{article}    % Separate title page
\documentclass[notitlepage]{report}   % Title on first page

% Abstract behavior (for article)
\documentclass[onecolumn]{article}    % Abstract spans full width
\documentclass[twocolumn]{article}    % Abstract spans both columns

Equation Options

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% Equation numbering
\documentclass[leqno]{article}        % Equation numbers on left
\documentclass[reqno]{article}        % Equation numbers on right (default)

% Equation formatting
\documentclass[fleqn]{article}        % Left-aligned equations
% Default: centered equations

Bibliography Options

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% Bibliography formatting
\documentclass[openbib]{article}      % Open bibliography format
% Default: closed bibliography format

Custom Document Classes

Creating Custom Classes

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% File: myclass.cls
\NeedsTeXFormat{LaTeX2e}
\ProvidesClass{myclass}[2024/01/01 My Custom Class]

% Based on article class
\LoadClass[11pt,a4paper]{article}

% Required packages
\RequirePackage{geometry}
\RequirePackage{fancyhdr}
\RequirePackage{graphicx}

% Page layout
\geometry{margin=1in}

% Custom commands
\newcommand{\institution}[1]{\def\@institution{#1}}
\newcommand{\course}[1]{\def\@course{#1}}

% Custom title format
\renewcommand{\maketitle}{
  \begin{center}
    {\LARGE\bfseries\@title}\\[1em]
    {\large\@author}\\
    {\large\@institution}\\
    {\large\@course}\\
    {\large\@date}
  \end{center}
}

Academic Document Classes

Thesis Classes

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% University-specific thesis classes
\documentclass{phdthesis}     % PhD thesis
\documentclass{msthesis}      % Master's thesis
\documentclass{ucthesis}      % UC system thesis

% Generic thesis classes
\documentclass[thesis]{memoir}
\documentclass{scrbook}       % KOMA-Script book class

% Configuration example
\documentclass[12pt,oneside,openright]{report}
\usepackage[margin=1.5in,left=2in]{geometry}
\usepackage{setspace}
\doublespacing

Journal Classes

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% IEEE papers
\documentclass{IEEEtran}

% ACM papers
\documentclass{acmart}

% Springer papers
\documentclass{llncs}         % Lecture Notes in Computer Science
\documentclass{svjour3}       % Springer journals

% Elsevier papers
\documentclass{elsarticle}

% AMS papers
\documentclass{amsart}

KOMA-Script Classes

Alternative to standard classes with enhanced features:

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% KOMA-Script equivalents
\documentclass{scrartcl}      % Instead of article
\documentclass{scrreprt}      % Instead of report
\documentclass{scrbook}       % Instead of book
\documentclass{scrlttr2}      % Instead of letter

% Enhanced features
\documentclass[
  fontsize=11pt,
  paper=a4,
  twoside=false,
  titlepage=false,
  headings=small
]{scrartcl}

% KOMA options
\KOMAoptions{
  DIV=12,                     % Text area calculation
  BCOR=8mm,                   % Binding correction
  headinclude=true,           % Include header in text area
  footinclude=false           % Exclude footer from text area
}

Memoir Class

Highly customizable class for books and articles:

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\documentclass[11pt,a4paper,oneside]{memoir}

% Page layout
\settrimmedsize{297mm}{210mm}{*}  % A4 paper
\setlength{\trimtop}{0pt}
\setlength{\trimedge}{\stockwidth}
\addtolength{\trimedge}{-\paperwidth}
\settypeblocksize{634pt}{448.13pt}{*}
\setulmargins{4cm}{*}{*}
\setlrmargins{2.5cm}{*}{*}
\checkandfixthelayout

% Chapter styles
\chapterstyle{veelo}          % Pre-defined style
% or create custom style
\makechapterstyle{custom}{
  \renewcommand{\chapternamenum}{}
  \renewcommand{\printchaptername}{}
  \renewcommand{\printchapternum}{\chapnumfont\thechapter\space}
  \renewcommand{\afterchapternum}{}
}

Document Class Comparison

When to Use Each Class

article
report
book
beamer

Best for:

Research papers (5-30 pages)
Journal submissions
Conference papers
Technical reports
Essays and assignments

Features:

No chapters
Compact layout
Abstract support
Bibliography integration

Best Practices

Document class selection tips:

Start with standard classes - They’re well-tested and widely supported
Consider document length - Article for short, report for medium, book for long
Check submission requirements - Journals often require specific classes
Use options wisely - Don’t override default typography without good reason
Test compilation early - Ensure your chosen class works with your packages
Read class documentation - Each class has specific features and commands

Quick Reference

Standard Classes Summary

Class	Purpose	Length	Chapters	Default Layout
`article`	Papers, reports	Short	No	One-sided
`report`	Technical reports	Medium	Yes	One-sided
`book`	Books, theses	Long	Yes	Two-sided
`beamer`	Presentations	N/A	No	Slides
`letter`	Correspondence	Short	No	Letter format

Common Options Summary

Option	Effect	Classes
`10pt`, `11pt`, `12pt`	Font size	All
`a4paper`, `letterpaper`	Paper size	All (except beamer)
`oneside`, `twoside`	Page layout	All (except beamer)
`onecolumn`, `twocolumn`	Column layout	article, report
`titlepage`, `notitlepage`	Title page	article, report
`draft`, `final`	Draft mode	All

Practice in LaTeX Cloud Studio

Open a project and choose a class

Start with article, report, or beamer in the browser editor and compile early to confirm the structure.

Templates that match the class

Use a working template when you want the document class and layout decisions already in place.

Next: Learn about LaTeX Packages to extend document functionality, or explore Document Structure for hands-on examples.

letterpaper	8.5 × 11 in
legalpaper	8.5 × 14 in
a4paper	210 × 297 mm
a5paper	148 × 210 mm

Documentation Index

​Which LaTeX Document Class Should You Use?

​The \documentclass Command

​Which Document Class Should You Use?

​Standard Document Classes

​article

​report

​book

​beamer

​letter

​Document Class Options

​Font Size Options

​Paper Size Options

​Layout Options

​Title Page Options

​Equation Options

​Bibliography Options

​Custom Document Classes

​Creating Custom Classes

​Academic Document Classes

​Thesis Classes

​Journal Classes

​KOMA-Script Classes

​Memoir Class

​Document Class Comparison

​When to Use Each Class

​Best Practices

​Quick Reference

​Standard Classes Summary

​Common Options Summary

​Practice in LaTeX Cloud Studio

Open a project and choose a class

Templates that match the class

Which LaTeX Document Class Should You Use?

The `\documentclass` Command

Which Document Class Should You Use?

Standard Document Classes

article

report

book

beamer

letter

Document Class Options

Font Size Options

Paper Size Options

Layout Options

Title Page Options

Equation Options

Bibliography Options

Custom Document Classes

Creating Custom Classes

Academic Document Classes

Thesis Classes

Journal Classes

KOMA-Script Classes

Memoir Class

Document Class Comparison

When to Use Each Class

Best Practices

Quick Reference

Standard Classes Summary

Common Options Summary

Practice in LaTeX Cloud Studio