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This question already has an answer here:

I seem to remember a command to show bad boxes in a PDF when using latex, but googling is not helping me to remember.

How can I show bad boxes in my PDF?

marked as duplicate by Werner, gernot, Mike Renfro, clemens, Mensch Apr 3 '17 at 19:22

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    add draft to the documentclass options. – Marco Daniel May 9 '11 at 16:50
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    Is there also an option for underfull hboxes? – white_gecko Apr 22 '13 at 9:30
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Pass the draft option to your document class or insert

\overfullrule=5pt

in your preamble. (Assuming that by bad boxes you mean overfull boxes.)

  • I vaguely recall some other command, but this certainly does the job. I may be thinking of the ConTeXt command.... who knows. Thanks for your help! – Mica May 9 '11 at 23:46
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    Doesn't this solution only work for bad hboxes? The question suggests that the OP is also interested in highlighting bad vboxes, but neither the draft option nor \overfullrule=5pt in the preamble accomplishes this. – Tyson Williams Mar 3 '13 at 15:01

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