- Trim size. Your printed book's width and height. You'll pick your trim size in the paperback setup process in KDP, but you also have to set your page size in Microsoft Word before you upload your book. The most common trim size for paperbacks in the U.S. is 6" x 9" (15.24 x 22.86 cm), but you have several other options. If you're unsure which size to pick, find books with content similar to yours to get an idea of what readers expect.
- Margins. The space between your text and the edges of the page. Every page has three outside margins (top, bottom, and side) and one inside margin (also called the gutter). This space helps to ensure your text is not cut off during manufacturing. Set your page size before you set your margins. Why? Margin size depends on page count. Your page size and margins also depend on whether you have elements that bleed.
- Bleed. Your book has elements (e.g., images) that extend to the edge of the page. Accounting for bleed matters because it will prevent a white border from appearing at the edge when your book is trimmed. Follow the instructions below for "bleed."
- No bleed. Your book's elements are within the margins. Follow the instructions below for "no bleed."
Find your margin sizes
|Page count||Inside (gutter) margins||Outside margins (no bleed)||Outside margins (with bleed)|
|24 to 150 pages||0.375" (9.6 mm)||at least 0.25" (6.4 mm)||at least 0.375" (9.4 mm)|
|151 to 300 pages||0.5" (12.7 mm)||at least 0.25" (6.4 mm)||at least 0.375" (9.4 mm)|
|301 to 500 pages||0.625" (15.9 mm)||at least 0.25" (6.4 mm)||at least 0.375" (9.4 mm)|
|501 to 700 pages||0.75" (19.1 mm)||at least 0.25" (6.4 mm)||at least 0.375" (9.4 mm)|
|701 to 828 pages||0.875" (22.3 mm)||at least 0.25" (6.4 mm)||at least 0.375" (9.4 mm)|