How to Format a Puzzle Book for Amazon KDP

The trim size is the finished page size, after the printer cuts the paper. Choose it first: margins, type size, how much of a map fits on a page and, in the end, the page count all follow from it. KDP offers a range of paperback trims, from small pocket sizes up to 8.5 × 11 in; not every trim is available with every ink and paper choice, so check KDP Help: Set Trim Size, Bleed, and Margins for the current list.

For a puzzle book, the trade-offs are practical:

• Larger trims (7 × 10 in, 8 × 10 in, 8.5 × 11 in) give maps, grids and clue lists room, and leave space to write. They suit puzzles that are solved on the page.
• 6 × 9 in is a familiar paperback size and easy to carry, with less room per page — fine for compact puzzles, tight for large maps.
• Small trims force small text and cramped grids. Test a real page printed at actual size before you commit: if the clues are hard to read or the grid is hard to write in, the trim is too small for that puzzle.

Bleed means something is printed right to the edge of the page — a background colour, a full-page photo. Because the cut is never perfectly exact, a page with bleed is set up larger than the trim and the artwork is extended past the cut line, so no thin white edge appears. No bleed means nothing reaches the edge: every page is set up at exactly the trim size and everything printed stays inside the margins.

KDP Help gives the numbers: with bleed, each page is 0.125 in larger on the outside, top and bottom edges — so the page is 0.125 in wider and 0.25 in taller than the trim (a 6 × 9 in trim becomes 6.125 in × 9.25 in). If even one page in the interior bleeds, the whole file has to be set up with bleed, and a bleed interior must be uploaded as a PDF. Bleed also raises the outside, top and bottom minimum margin from 0.25 in to 0.375 in (KDP Help: Set Trim Size, Bleed, and Margins).

Most puzzle interiors do not need bleed: white pages with text, grids and maps inside the margins print cleanly without it. Choose bleed only if a design genuinely runs to the edge.

Margins keep content away from the cut edges and out of the binding. A paperback has two kinds:

• The inside margin (gutter) is on the spine side. It must grow with the page count, because a thicker book curves more into the spine.
• The outside, top and bottom margins are at least 0.25 in without bleed (0.375 in with bleed), whatever the page count.

KDP’s minimum inside margin, by page count (KDP Help: Set Trim Size, Bleed, and Margins):

On facing pages the inside margin swaps sides: on a right-hand (odd) page it is on the left; on a left-hand (even) page it is on the right. In a word processor this is “mirror margins”. These are minimums: leaving a little more is safe; leaving less is a problem the Print Previewer will flag.

Inside the margins, a puzzle page has to work as a tool. A few rules hold for most puzzle books:

• Keep each puzzle on one page, or on one spread. A clue list that continues overleaf makes the reader flip back and forth.
• Size text for print, not the screen. Clues, labels and grid letters should be comfortable at arm’s length; print a test page at actual size.
• Leave room to write. Grids and maps need cells large enough for a pencil mark, and a worksheet page earns its place for longer puzzles.
• Keep thin lines printable. Hairline grid rules and pale greys can disappear in print; check them in a proof copy.
• Keep the answer off the puzzle page. Nothing on the page should give the solution away — not a highlighted name, not the order of a list.

Where the answers go changes how the book is used. There are two common layouts:

• A solutions section at the back, after all the puzzles. Turning the page never spoils the next puzzle; a divider page marks where the answers start.
• Each solution straight after its puzzle. Convenient for books solved one sitting at a time, but a glance at the next page gives the answer away.

Either way, make answers easy to find: number every puzzle, label each solution with the same number, and print page numbers. For a long book, a table of contents helps readers jump between sections.

Page count matters three times over:

• It has limits. KDP’s paperback minimum is 24 pages. The maximum depends on ink, paper and trim — up to 828 pages for the most common combinations, fewer for others (KDP Help: Paperback Submission Guidelines).
• It sets the inside margin. Crossing a bracket in the table above — from 150 to 151 pages, say — means a wider inside margin, which narrows every page’s live area.
• It sets the spine width, and so the size of the cover file (step 8).

So fix the page count before you finalise the cover, and recheck the inside margin after any edit that adds or removes pages. Remember that front matter, divider pages and blank pages all count.

This is a hypothetical book, for illustration. Picture a mystery puzzle book at 6 × 9 in, black ink, no bleed, with solutions at the back. Each case takes 3 pages (puzzle, worksheet, solution); there are 4 front-matter pages and 2 at the back (a solutions divider and an About the Author page). Two versions:

Margins

At 96 pages the book falls in the first bracket, so the inside margin is at least 0.375 in. Doubling the cases takes it to 186 pages, into the next bracket: the inside margin becomes 0.5 in and every page loses 0.125 in of width. A layout designed for the shorter book must be rechecked for the longer one.

No bleed

The PDF pages are exactly 6 × 9 in; nothing is printed within 0.25 in of the outside, top or bottom edge, or within the inside margin of the spine.

Readable elements

Each puzzle’s map and clues sit inside the 5.375 in × 8.5 in live area, on one page; page numbers and running heads also stay inside the margins.

Solutions

Puzzles 1–30 come first, then the divider, then the solutions in the same order, each labelled with its puzzle’s number.

Before upload

Check that the page count is final, the cover is sized for that page count and paper, and the PDF opens at 6 × 9 in on every page.

KDP prints from the interior file you upload. For a puzzle book, a PDF is the safest choice. What KDP Help asks of it:

• Every page at the trim size (or trim plus bleed, if you use bleed), in reading order, one page per page.
• Images at least 300 DPI at the size they print. To check one: its pixel width divided by its printed width in inches.
• Fonts embedded in the PDF, so the printer uses the ones you chose.
• No printer’s marks or extras — no crop marks, comments or annotations.

See KDP Help: Paperback Submission Guidelines for the full list. If you print in black ink, check that any colour on your pages still reads in greyscale.

The cover is a separate file from the interior, uploaded separately. For a paperback it is one PDF holding the back cover, the spine and the front cover side by side, with bleed on every edge (0.125 in). Its width is:

bleed + back cover + spine + front cover + bleed

The back and front are each the trim width; the spine width depends on the page count and the paper. Because the spine depends on the page count, make the cover after the interior is final. KDP’s cover calculator and KDP Help: Create a Paperback Cover give the exact dimensions for your book, and say when a book is thick enough for spine text.

You can design the cover yourself, have a designer make it, or use KDP’s Cover Creator. Whatever you use, start from the dimensions for this book: a cover made for a different page count will not fit.

When you upload the interior and cover, KDP checks them and shows the book in its Print Previewer. It flags problems it can detect — content outside the margins, pages at the wrong size, fonts that are not embedded — and KDP Help: Fix Paperback and Hardcover Formatting Issues explains each one. It cannot judge whether a puzzle works, so page through the whole book yourself:

For a print run you care about, order a proof copy: some problems — line weights, writing space — only show on paper.

Everything above applies whatever you make your book with. If you make mystery puzzle books, Cluevora handles the interior side of it for you:

1. Choose the trim size, then generate cases from structured settings — the case type, size, map style and difficulty.
2. Add your front matter and choose where the solutions go; the book’s pages appear along the bottom of the Studio.
3. Export: the Studio checks every page fits, applies the margins for the final page count, and writes the PDF.
4. Make the cover for that page count, upload both files to KDP, and review them in the Print Previewer.

For the craft behind the cases, read how to design a mystery puzzle with exactly one solution; for planning a whole mystery book, see creating mystery puzzle books for Amazon KDP; and to see complete exported cases, browse real mystery puzzle book examples.

The KDP figures in this guide come from these official KDP Help pages, last checked on 16 October 2026. KDP updates them; the live pages are the authority.