InteriorBuilder

1. Trim size & page count

Trim size

Page count Paper type

Bleed — only needed when printing to the edge

2. Page template

Template

3. Front matter & numbering

"This book belongs to" page (page 1, page 2 left blank) Owner page title Right-hand pages only (left pages blank — for sketchbooks, coloring) Page numbers

4. Margins (inches)

Gutter (inside) Outside

Top Bottom

Auto gutter from page count (KDP minimum + 0.125")

5. Style

Line color Accent line color

Text color Heading fill

Line weight (pt) Font

Publishing a low-content book

Pick a trim size (6" x 9" and 8.5" x 11" are the most common) and a page count (even, at least 24).
Choose a page template, adjust its options and check the preview on the right.
Click Download interior PDF. Bleed is not needed unless content touches the page edge.
Open the Cover tab, enter your title, turn off the guides, then Download cover PDF.
On KDP: choose Paperback, tick Low-content book (no ISBN required), upload both PDFs and check them in Launch Previewer.

Key rules

Minimum gutter: 24–150 pages 0.375", 151–300: 0.5", 301–500: 0.625", 501–700: 0.75", over 700: 0.875".
Minimum outside margin: 0.25" without bleed, 0.375" with bleed.
Books with 79 pages or fewer cannot have spine text.
Barcode area: KDP prints a 2" x 1.2" barcode at the bottom right of the back cover — keep text out of it.
The built-in fonts only cover basic Latin characters. For accented or non-Latin text, upload a .ttf font (e.g. Roboto, Noto Sans).
Puzzle books (sudoku, word search) usually do not count as low-content on KDP: publish them as regular paperbacks and use KDP's free ISBN.
Each puzzle set comes from its seed. Use a different seed for every book so no two books share puzzles.
Popular niches: gratitude journals, password logs, mileage logs, recipe books, kids' handwriting practice, habit trackers, yearly planners.