A gutter margin adds extra space to the side margin, top margin, or inside margins of a document that you plan to bind. A gutter margin helps ensure that text isn't obscured by the binding.
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Go to Layout > Margins.
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Select Custom Margins.
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In the Gutter box, enter a width for the gutter margin.
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In the Gutter position box, click Left or Top.
Note: The Gutter position box is not available and determined automatically when you use the Mirror margins, 2 pages per sheet, or Book fold option.
Add a gutter margin for bound documents
A gutter margin adds extra space to the side, top margin, or inside margins of a document you plan to bind. That helps ensure that text isn't obscured by the binding.
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Click Layout > Margins > Custom Margins.
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In the Gutter box, enter a width for the gutter margin.
While Word for the web will honor a gutter margin set in Word for the Desktop, it only supports changing the Top, Bottom, Left, and Right margins.
