Headers and Footers in LaTeX

\documentclass{article}
\begin{document}

% Set page style for entire document
\pagestyle{headings}

% Or change style for current page only
\thispagestyle{empty}

\section{Introduction}
This page will have the style set above.

\newpage
\section{Methods}
This page continues with the document page style.

\end{document}

\documentclass{article}
\usepackage{fancyhdr}

% Activate fancy page style
\pagestyle{fancy}

% Clear default headers and footers
\fancyhf{}

% Set headers and footers
\fancyhead[L]{Left Header}
\fancyhead[C]{Center Header}  
\fancyhead[R]{Right Header}
\fancyfoot[L]{Left Footer}
\fancyfoot[C]{Page \thepage}
\fancyfoot[R]{Right Footer}

% Customize the line under header
\renewcommand{\headrulewidth}{0.4pt}
\renewcommand{\footrulewidth}{0.4pt}

\begin{document}

\section{Sample Content}
This page demonstrates basic header and footer customization.

\newpage
\section{More Content}
Headers and footers appear consistently across pages.

\end{document}

\documentclass[twoside]{article}
\usepackage{fancyhdr}
\pagestyle{fancy}
\fancyhf{}

% For two-sided documents
\fancyhead[LE,RO]{\thepage}  % Left on Even pages, Right on Odd pages
\fancyhead[LO,RE]{\leftmark} % Left on Odd pages, Right on Even pages

% Alternative: use combinations
\fancyhead[L]{\ifnum\value{page}=1 Title Page \else \leftmark \fi}
\fancyfoot[C]{Footer text}

% For one-sided documents, use simple positions:
% L (Left), C (Center), R (Right)

\begin{document}

\section{Introduction}
Content for testing headers...

\newpage
\section{Methods}
More content to show header changes...

\end{document}

\documentclass{article}
\usepackage{fancyhdr}
\usepackage{lastpage}

\pagestyle{fancy}
\fancyhf{}

% Dynamic page information
\fancyhead[L]{\leftmark}
\fancyhead[R]{\today}
\fancyfoot[L]{Document Title}
\fancyfoot[C]{Page \thepage\ of \pageref{LastPage}}
\fancyfoot[R]{Author Name}

% Custom header rule
\renewcommand{\headrulewidth}{0.5pt}
\renewcommand{\headrule}{\hbox to\headwidth{\color{blue}\leaders\hrule height \headrulewidth\hfill}}

% Different style for first page
\fancypagestyle{firststyle}{%
  \fancyhf{}
  \fancyfoot[C]{\thepage}
  \renewcommand{\headrulewidth}{0pt}
}

\begin{document}

\thispagestyle{firststyle}
\title{Document Title}
\author{Author Name}
\maketitle

\section{Introduction}
Regular pages use the main fancy style.

\newpage
\section{Methods}
Headers automatically update with section names.

\end{document}

\documentclass{book}
\usepackage{fancyhdr}
\usepackage{ifthen}

\pagestyle{fancy}
\fancyhf{}

% Different headers for different page types
\fancyhead[LE,RO]{\thepage}
\fancyhead[LO]{\ifthenelse{\isodd{\value{page}}}{\rightmark}{\leftmark}}
\fancyhead[RE]{\ifthenelse{\isodd{\value{page}}}{\leftmark}{\rightmark}}

% Chapter-specific footers
\fancyfoot[C]{%
  \ifthenelse{\value{chapter}>3}
    {Advanced Topics}
    {Foundation Material}
}

% Special handling for chapter pages
\fancypagestyle{plain}{%
  \fancyhf{}
  \fancyfoot[C]{\thepage}
  \renewcommand{\headrulewidth}{0pt}
}

\begin{document}

\chapter{Introduction}
Chapter content here...

\chapter{Background} 
More content...

\chapter{Methods}
Even more content...

\chapter{Advanced Topics}
Notice the footer changes here...

\end{document}

\documentclass{article}
\usepackage{fancyhdr}

\pagestyle{fancy}
\fancyhf{}

% Multi-line header
\fancyhead[L]{%
  \begin{tabular}{l}
  \textbf{Document Title} \\
  \textit{Subtitle}
  \end{tabular}
}

\fancyhead[R]{%
  \begin{tabular}{r}
  Author Name \\
  \today
  \end{tabular}
}

% Adjust header height for multi-line content
\setlength{\headheight}{28pt}

\fancyfoot[C]{\thepage}

\renewcommand{\headrulewidth}{0.4pt}

\begin{document}

\section{Sample Section}
This demonstrates multi-line headers with proper spacing.

\end{document}

\documentclass{article}
\usepackage{fancyhdr}
\usepackage{graphicx}

\pagestyle{fancy}
\fancyhf{}

% Logo in header
\fancyhead[L]{\includegraphics[height=20pt]{company-logo}}
\fancyhead[C]{\textbf{CONFIDENTIAL}}
\fancyhead[R]{\thepage}

% Watermark-style footer
\fancyfoot[C]{%
  \begin{picture}(0,0)
    \put(-50,-10){\includegraphics[width=2cm,opacity=0.3]{watermark}}
  \end{picture}
}

% Adjust header height for graphics
\setlength{\headheight}{25pt}

\begin{document}

\section{Document with Graphics}
Headers can include logos and other graphics elements.

\end{document}

\documentclass{report}
\usepackage{fancyhdr}

\pagestyle{fancy}
\fancyhf{}

% Use LaTeX's automatic sectioning marks
\fancyhead[LE,RO]{\thepage}
\fancyhead[LO]{\nouppercase{\rightmark}} % Section name
\fancyhead[RE]{\nouppercase{\leftmark}}  % Chapter name

% Customize how marks are created
\renewcommand{\chaptermark}[1]{%
  \markboth{\thechapter.\ #1}{}
}
\renewcommand{\sectionmark}[1]{%
  \markright{\thesection.\ #1}
}

% Remove uppercase from marks
\renewcommand{\MakeUppercase}[1]{#1}

\begin{document}

\chapter{Introduction}
\section{Overview}
Content here shows chapter and section in headers.

\section{Scope}
More content to demonstrate header updates.

\chapter{Methods}
\section{Data Collection}
New chapter shows different header content.

\end{document}

\documentclass{article}
\usepackage{fancyhdr}

% Custom command to set header content
\newcommand{\sectionheader}[1]{%
  \markright{#1}
}

\pagestyle{fancy}
\fancyhf{}

\fancyhead[L]{\rightmark}
\fancyhead[R]{\thepage}
\fancyfoot[C]{Custom Document Footer}

\begin{document}

\section{Introduction}
\sectionheader{Introduction to LaTeX Headers}

This section has a custom header description.

\section{Methods}  
\sectionheader{Research Methodology and Approach}

Different custom header for this section.

\end{document}

\documentclass{article}
\usepackage{fancyhdr}

% Define special style for title page
\fancypagestyle{titlepage}{%
  \fancyhf{}
  \fancyfoot[C]{\textit{Draft Version - \today}}
  \renewcommand{\headrulewidth}{0pt}
  \renewcommand{\footrulewidth}{0.4pt}
}

% Define style for table of contents
\fancypagestyle{toc}{%
  \fancyhf{}
  \fancyhead[C]{\textsc{Contents}}
  \fancyfoot[C]{\thepage}
  \renewcommand{\headrulewidth}{0.4pt}
}

% Main document style
\pagestyle{fancy}
\fancyhf{}
\fancyhead[L]{\leftmark}
\fancyhead[R]{\thepage}
\fancyfoot[C]{Main Document}

\begin{document}

% Use title page style
\thispagestyle{titlepage}
\title{Document Title}
\author{Author Name}
\maketitle

\newpage

% Use TOC style
\pagestyle{toc}
\tableofcontents

\newpage

% Switch to main style
\pagestyle{fancy}
\section{Introduction}
Main content with standard headers...

\end{document}

\documentclass{article}
\usepackage{fancyhdr}

% Style for bibliography pages
\fancypagestyle{bibliography}{%
  \fancyhf{}
  \fancyhead[L]{\textsc{References}}
  \fancyhead[R]{\thepage}
  \fancyfoot[C]{\textit{Bibliography}}
  \renewcommand{\headrulewidth}{0.4pt}
  \renewcommand{\footrulewidth}{0pt}
}

% Main document style
\pagestyle{fancy}
\fancyhf{}
\fancyhead[L]{\leftmark}
\fancyhead[R]{\thepage}

\begin{document}

\section{Introduction}
Main content here...

% Switch to bibliography style
\newpage
\pagestyle{bibliography}

\begin{thebibliography}{9}
\bibitem{ref1}
Author, A. (2023). Paper title. \textit{Journal Name}, 10(2), 123-145.
\end{thebibliography}

\end{document}

\documentclass{article}
\usepackage{fancyhdr}
\usepackage{xcolor}
\usepackage{tikz}

\pagestyle{fancy}
\fancyhf{}

% Boxed header with color
\fancyhead[L]{%
  \colorbox{lightgray}{%
    \parbox{3cm}{\centering\textbf{Section}\\\leftmark}
  }
}

\fancyhead[R]{%
  \fcolorbox{black}{yellow}{%
    \parbox{2cm}{\centering Page \thepage}
  }
}

% Fancy footer with TikZ
\fancyfoot[C]{%
  \begin{tikzpicture}[remember picture,overlay]
    \draw[thick,blue] (0,0) -- (2,0);
    \node at (1,0.2) {\textbf{Document Footer}};
  \end{tikzpicture}
}

\setlength{\headheight}{25pt}

\begin{document}

\section{Sample Section}
This page demonstrates boxed headers and graphic footers.

\end{document}

\documentclass{article}
\usepackage{fancyhdr}

% Set appropriate header height BEFORE using fancy
\setlength{\headheight}{30pt}  % Adjust as needed

\pagestyle{fancy}
\fancyhf{}

% Multi-line header that needs more space
\fancyhead[L]{%
  Line 1\\Line 2\\Line 3
}

% If you get warnings about headheight, increase it:
% \addtolength{\headheight}{5pt}

\begin{document}
Content here...
\end{document}

\documentclass{article}
\usepackage{fancyhdr}

\pagestyle{fancy}
\fancyhf{}

% Prevent headers from affecting page breaks
\fancyhead[L]{\leftmark}
\fancyhead[R]{\thepage}

% Use phantom content to prevent widow/orphan issues
\fancyfoot[C]{%
  \phantom{Invisible content for spacing}
  Page \thepage
}

% Adjust penalties if needed
\clubpenalty=10000
\widowpenalty=10000

\begin{document}

Content that flows across pages...

\end{document}

\documentclass[11pt,letterpaper]{article}
\usepackage{fancyhdr}
\usepackage{lastpage}

% Professional document setup
\pagestyle{fancy}
\fancyhf{}

% Header: document info on left, page on right
\fancyhead[L]{\textbf{Project Report} | \leftmark}
\fancyhead[R]{Page \thepage\ of \pageref{LastPage}}

% Footer: company info and date
\fancyfoot[L]{Company Name}
\fancyfoot[C]{\textit{Confidential}}
\fancyfoot[R]{\today}

% Clean lines
\renewcommand{\headrulewidth}{0.5pt}
\renewcommand{\footrulewidth}{0.3pt}

% Adjust spacing
\setlength{\headheight}{14pt}

\begin{document}

\section{Executive Summary}
Professional document content...

\end{document}