The “gutter” is a typographical term referring to an additional margin added to interior pages to compensate for the part of the page made unusable by the binding process. In a facing pages layout, the gutter margin is on the inside of both pages. Interiors of less than 60 pages don’t normally need to include a gutter, but files with higher page count should consider using a gutter.
For more information, use this table:
| Page Count | Add to Interior Margin | Recommended Interior Margin | Recommended Interior Margin (Full-Bleed) |
|---|---|---|---|
| Less than 60 | 0" or 0 mm | 0.5 or 13 mm | 0.625 or 26 mm |
| 61 to 150 | 0.125" or 3 mm | 0.625" or 16mm | 0.75" or 19mm |
| 151 to 400 | 0.5" or 13 mm | 1" or 25 mm | 1.125" or 29 mm |
| 400 to 600 | 0.625" or 16mm | 1.125" or 29 mm | 1.25" or 32 mm |
| over 600 | 0.75" or 19 mm | 1.25" or 32 mm | 1.375" or 35 mm |
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