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(At least) The article, report and book classes support the option draft, which displays hyphenation and justification problems with a black square, but also does not load figures. I could have the latter without the former, but can I also only have (at least something like) the black squares, but still load figures?

A bonus would be to display the possible hypenation points as possible in LuaTeX for pdflatex.

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    \usepackage[final]{graphicx} will override the global draft option. – egreg Oct 30 '14 at 23:36
  • Regarding your second query: I don't think it's possible to get the equivalent of the showhyphens package under pdflatex. For one, pdftex cannot hyphenate the first word of a paragraph, any paragraph. Second, showhyphens also makes direct use of the specialized hyphenation algorithm of luatex, which operates quite differently from that of pdftex. – Mico Oct 30 '14 at 23:39
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    @Mico it's probably worth saying that "pdftex cannot hyphenate the first word of a paragraph" doesn't mean that pdftex can't hyphenate the thing a human reader would think of as the first word of the paragraph, just that it won't hyphenate a word that is at the start of a horizontal list, but a zero width space before the word is enough to allow hyphenation again) (true showhyphens is lua though:-) – David Carlisle Oct 30 '14 at 23:51
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    There is also testhyphens. – cfr Oct 30 '14 at 23:54
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    @Mico My mental model of German is that English Paragraph = German Word and it's needed all the time:-) (authors don't need to do it but packages can set up \everypar to add it (with care) – David Carlisle Oct 31 '14 at 0:14
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to display the black box that indicates overfull lines without any of the other side effects of the [draft] option, put this in your preamble:

\setlength\overfullrule{5pt}

you can reset this at any time within your document. setting it to a value of 0pt makes it disappear.

the package testhyphens suggested by @cfr is also a very useful tool for checking blocks of text in situ; it seems not so attractive to apply to an entire document in a single go.

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