I'm using PDFLaTeX to create forms and ran into a problem with the \TextField macro that defines input fields:
\TextField[width=4in,name=sample]{}
The resulting field is a little wider than 4 inches and I don't understand why. The following example illustrates the problem by resulting in an overfull hbox which gets highlighted because by an overfull rule.
\documentclass[a4paper,11pt]{article}
\usepackage[latin1]{inputenc}
\usepackage[pdftex]{hyperref}
\overfullrule3pt
\begin{document}
\noindent \TextField[name=one, width=\hsize]{type here:}
\end{document}
The resulting PDF will show an overfull input field despite having specified exactly the available space as the desired width.