KDP publishing
Trim sizes, bleed, spine width, ISBNs and printing costs — the technical side of publishing paperbacks on Amazon KDP.
KDP Cover Size: How to Work Out a Full-Wrap Paperback Cover
A KDP paperback cover is one image: back, spine and front, plus bleed. Here is the formula, the spine width per page for each paper, worked examples for common trim sizes and the pixel size to export at.
Nov 2, 2026 · 4 min read
How Much Does KDP Charge to Print a Paperback? (2026 Costs)
KDP's printing cost is a fixed charge plus a charge per page, set by ink and trim size. Here are the 2026 Amazon.com figures, worked examples by page count, and how printing cost sets your lowest list price.
Nov 2, 2026 · 4 min read
ISBN Barcodes for KDP Paperbacks: When You Need Your Own
KDP adds a barcode to your paperback for free. Here is when you still want your own, how to make one from your ISBN, and exactly where it goes on the back cover.
Nov 2, 2026 · 5 min read
Trim Size for Puzzle Books: 6×9 vs 8×10 vs 8.5×11
Which KDP trim size suits word search, sudoku, crossword, maze, bingo and coloring books — with letter sizes, printing costs and margins for each.
Oct 31, 2026 · 4 min read
KDP Paperback Royalties 2026: The 50% Rule Under $9.99
On Amazon.com, KDP pays 60% of a paperback's price from $9.99 and 50% below it, minus printing. See what that does to your royalty, with worked examples.
Oct 31, 2026 · 6 min read