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Is it possible to make LaTeX mark overfull boxes in the output, for example by drawing red rectangles in the PDF where the boxes overflow? The purpose -- to more easily "see" where the problems are in the output.

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\documentclass[draft]{article} – David Carlisle Oct 3 '12 at 10:29
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This is the duty of the draft option to \documentclass – egreg Oct 3 '12 at 10:30
So simple... thanks! – Vegard Oct 3 '12 at 10:32
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Out of curiosity: are there other visual warnings available? – Christian Lindig Oct 3 '12 at 11:05
@ChristianLindig unfortunately, not really. You cannot visualize underfull \hbox, nor over/underfull \vbox nor over/underfull \vbox while \output is active. You have to read the .log to find these. – tohecz Oct 3 '12 at 11:27
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up vote 19 down vote accepted

As David Carlisle and egreg said, you can use the draft option in most classes.

If you wish to do it by hand (for example, you need a final option to check for another package's rendering) or tune it, you can use

\overfullrule=1mm

in the document preamble.

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