KDP Book Formatting
KDP book formatting means producing files that meet Amazon's specific requirements: embedded fonts, gutter margins that scale with page count, reflowable EPUB for Kindle, and correct trim sizes for print.
$299 one-time purchase. Buy once. It is yours.
Why this is harder than it looks.
Most tools treat a book as a stream of text. A book is a structured object with a memory, a voice, and dependencies between its parts.
Formatting a book for KDP is not the same as formatting a document for printing. Amazon has specific requirements, and if your files do not meet them, your book gets rejected or prints incorrectly. For print, you need a PDF with embedded fonts, gutter margins that scale with your page count, and the correct trim size. For Kindle, you need a reflowable EPUB, not a fixed-layout file, so the reader can adjust font size and the text reflows correctly. Get any of these wrong and you are back in the formatting tool, rebuilding the file, hoping the next attempt passes.
The gutter margin problem alone trips up many authors. KDP requires gutter margins to scale with page count: a 300-page book needs more inner margin than a 100-page book, because more pages means more paper curvature at the spine. If you use a fixed margin, text disappears into the gutter on thick books or looks too sparse on thin ones. Most formatting tools expect you to calculate this yourself, look it up in a table, and enter it manually. It is error-prone and tedious.
What authors need is formatting software that knows KDP's requirements, calculates gutter margins from page count automatically, embeds fonts, produces reflowable EPUB for Kindle and single-page PDF for print, and runs a readiness check before export so you know the file will pass the first time.
How Inkloom solves this.
Inkloom is not a word processor with an AI chat box bolted on. It is a manuscript operating system that understands the book as a whole.
Inkloom produces KDP-ready files from one application. It supports all five KDP trim sizes: 5x8, 5.25x8, 5.5x8.5, 6x9, and 7x10 inches. Each has a default body size and proportional type scale. Gutter margins are computed automatically from your page count, so you do not need to look up a table or do math. Fonts are embedded in the print PDF, which is what KDP requires. The Kindle export is a reflowable EPUB, not a fixed-layout file.
Before you export, a readiness check runs and reports what needs attention: missing front matter, unsupported claims, unresolved conflicts, or formatting gaps. You see the list, you fix what matters, and then you export. The result is a file that meets KDP's requirements the first time, without rebuilding your book in a separate application.
- Five KDP trim sizes with presets, default body sizes, and proportional type scales
- Gutter margins computed automatically from page count, no manual lookup required
- Print PDF with embedded fonts and reflowable Kindle EPUB from one export
- Readiness check reports what needs attention before you publish, so files pass the first time
Your manuscript lives on your computer. Not ours.
Inkloom runs locally. Your manuscript lives in a local database. The only thing that leaves your machine is what you explicitly send to your own OpenRouter account for generation. A privacy lock can keep your manuscript entirely local even when a key is stored.
Read the privacy explainer ->What Inkloom actually does
No fabricated testimonials. No invented statistics. Just what the software does.
Related Inkloom tools
KDP Export
Print presets in all five KDP trim sizes produce single-page PDFs with embedded fonts and gutter margins computed from page count. Kindle export is a reflowable EPUB. Also DOCX, Markdown, and plain text. A readiness check reports what needs attention before you publish.
Typography
Choose from 110 book typefaces with job-based metadata. Preset templates match your book type. Open-license fonts are bundled and embedded in exports. Your typography follows a semantic scale where everything is a ratio of your body size.
Book Preview
Preview in three formats: print book (true to your trim's aspect ratio), e-reader (flowing, like Kindle), and editorial manuscript (double-spaced monospace). Print and manuscript previews are genuinely paginated. Click any paragraph to spot-edit.
Cover Studio
Cover Studio has two paths. Create Cover generates new cover concepts from your manuscript identity. Prepare Existing Cover takes artwork you already have and makes it print-ready. The Print Cover Calculator computes exact spine width, wraparound dimensions, and barcode clear zone for both paths.
Continue learning
How to Format a Book for KDP
KDP has specific formatting requirements for print and Kindle files. Getting them right the first time saves rejection emails and rework. Here is what KDP actually wants.
How KDP Gutter Margins Work
Gutter margins are the inner margins on a printed book page. They need to scale with your page count, or text disappears into the spine. Here is how KDP calculates them and how to get them right.
What Is Book Typesetting?
Typesetting is not formatting. It is the craft of arranging text on a page for readability, aesthetics, and print production. Here is what typesetting actually involves and why it matters for your book.
Best Fonts for Book Interiors
Choosing a book font is not about picking something that looks nice on screen. It is about long-form readability, print suitability, genre expectations, and licensing. Here is how to choose.
Frequently asked questions
What file formats does KDP accept?
KDP accepts print PDF for paperback and hardcover, and EPUB for Kindle. The PDF needs embedded fonts and correct gutter margins. The EPUB needs to be reflowable, not fixed-layout. Inkloom produces both in the correct format.
How do I format a book for KDP?
Choose your trim size, set gutter margins based on page count, embed your fonts, and export as a single-page PDF for print or a reflowable EPUB for Kindle. Inkloom handles all of this, including the margin calculation.
What are KDP trim sizes?
KDP offers five standard trim sizes for paperbacks: 5x8, 5.25x8, 5.5x8.5, 6x9, and 7x10 inches. Each has a default body size and proportional type scale. Inkloom has presets for all five.
Go from manuscript to KDP-ready files.
Print PDF, EPUB, DOCX, and Markdown from one application. A readiness check reports what needs attention.
Your book is bigger than a prompt.
Give it a memory.
Inkloom helps you plan, write, remember, check, polish, typeset, cover, and publish a coherent book from one integrated local-first environment.
$299 one-time purchase. Buy once. It is yours.