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I'm using a documentclass which looks dramatically different in draft mode compared to final. I'm preparing my document for the final formatting, so I don't want to pass the draft option.

However I would like to see overfull hboxes marked with the visible black bar (slug) in the same way as \documentclass[draft]{article}. Is there a way to turn on this visualization separately to using the draft option?

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up vote 14 down vote accepted

You can set \overfullrule=1mm to display overfull lines regardless of the draft mode.

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(In article.cls, the option is defined by \DeclareOption{draft}{\setlength\overfullrule{5pt}}, hence 5pt is the default length.) – cyberSingularity Nov 24 '12 at 9:53

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