Why is a paragraph set with wide word spaces?
Justified text — text that reaches both margins, the way books are set — gets there by stretching the spaces between words. On almost every line that stretch is a fraction of a space and nobody sees it. The median paragraph in a book set here sits about 3% over natural.
Sometimes a paragraph gets much more than that. Every one of its lines carries wide spaces, and the block reads gray and airy next to the paragraphs around it. That is what the Wide word spacing item in the findings panel is counting.
Why it happens to that paragraph and not its neighbor
A paragraph is set as a whole, not line by line. The formatter tries every way of breaking it and keeps the most even one — so when a paragraph comes out wide, it is because none of the ways were better.
That usually means the paragraph has one line more than its words naturally want. Spread the same words over one line fewer and they would not fit; over the line count it has, every line ends up slightly under-full, and the spaces take up the difference.
Long unbreakable words make it more likely — names, technical terms, numbers, anything hyphenation cannot split. So do very short measures, which is why a narrow trim shows this more than a wide one.
The two shapes
- Paragraphs set wide. Four lines or more, all of them stretched. The gray patch.
- A gap you can see. One line carrying a single word space twice its normal width or more. Less common and more obvious — a hole rather than a haze.
What we already do about it
Before you see any of this, the formatter has already spent its own tools on it. It scales the letterforms themselves by a fraction of a percent — up to 4%, the point where the shapes start to show — so the glyphs absorb slack that would otherwise land in the spaces. Measured over six novels, that alone cuts gaps over 150% of natural by three to five times.
What reaches the panel is what is left after that. There is no more room in the setting; the rest is in the words.
What you can do
Open the item and each paragraph carries a measured ask — Add 4, Add 10. That is not a guess: the formatter re-set that paragraph at each length and reports the smallest one that brings the spacing back to normal.
Press it and the editor opens on the paragraph with the page beside it. Add roughly what it asked, in your own words, and watch the figure at the bottom of the window: it tells you where the spacing is now and where it started. The figure is the answer, not the word count — your sentence is not our test sentence, so it will land somewhere near, not exactly.
Two things that make this safe to do:
- The paragraph keeps the same number of lines. Nothing after it moves, your page count does not change, and no page that ended level stops ending level.
- The channels go with it. Rivers of white are what wide spaces look like when they happen to line up down the page, so settling the spacing usually closes them. On one paragraph measured here, going from 112% wider to 17% closed every channel in it.
Some paragraphs cannot be settled by a small edit. Those are listed too, in gray, with Open instead of an ask — you can still change them, but nothing short was found that works.
Or change the setting instead
Wide spacing is partly the price of filling pages to the bottom. If a lot of paragraphs are flagged, the Page fill setting is the other lever — see What is Page fill, and what is a river of white?
Advanced Typeset also counts these now, so the style and margin it recommends for your book is partly chosen to leave you fewer of them — see What is Advanced Typeset?