Author Guides · Publishing · KDP + IngramSpark

KDP vs IngramSpark file requirements: what actually differs

By Tracy Atkins, founder of BookDesigner.ai and BookDesignTemplates.com · 15+ years of print files, 70,000+ authors · Updated July 1, 2026

The short answer: your interior usually moves between them with small adjustments; your covers never do. IngramSpark preflights strictly (PDF/X-1a, CMYK, a 240% ink cap, template-exact dimensions, barcode in the file) while KDP is forgiving and adds its own barcode. Hardcover geometry is flatly incompatible: KDP's case board is wider than your trim, IngramSpark's is narrower, and their spines come from different tables. Publishing on both means two cover files and your own ISBN.

Why authors use both

KDP is the direct door to Amazon, where most self-published sales happen. IngramSpark feeds the Ingram catalog, which is how bookstores, libraries, and international retailers order. The standard wide-distribution setup is both platforms carrying the same edition under your own ISBN (KDP's free ISBN is Amazon-only and cannot travel to Ingram). That means preparing files that satisfy two different preflight systems.

The side-by-side

	Amazon KDP	IngramSpark
PDF standard	Any well-formed PDF; fonts embedded	PDF/X-1a:2001 (or X-3), flattened, fonts embedded
Cover color	RGB or CMYK accepted	CMYK only; total ink 240% max; no spot colors
Barcode	Adds its own if you leave the area clear	Mandatory in your file; 100% black on white
Cover template	Online calculator + downloadable template	Template Generator; the file should be built on it at its full document size
Interior bleed	Trim + 0.125" W / + 0.25" H when used	0.125" all four sides when used
Paperback range	24–828 pages	18–1,200 pages (paper-dependent)
Hardcover range	75–550 pages	18 to roughly 1,050 pages
Hardcover board	Wider than trim	Narrower than trim (width − 0.185")
Review style	Largely automated; previewer shows issues instantly	Automated preflight plus human technicians; spec mismatches stop the title

The three traps that catch wide publishers

Reusing the KDP cover at IngramSpark. Even when the trim and page count match, the spine math, bleed handling, barcode, ink limit, and PDF standard differ. This is the most common source of the "not built to the correct specifications" rejection. (Full decode of that email here.)
Hardcover math from the wrong platform. A 300-page book on white paper: KDP computes its case wrap around a board wider than your trim; IngramSpark's board is 0.185" narrower with a 0.6875" spine from their stepped table. There is no overlap; each needs its own file. (The spine tables.)
The free-ISBN lock. Using KDP's free ISBN means that edition cannot exist at Ingram. Buy your own (Bowker in the US) before the first upload if wide distribution is the plan; changing an ISBN later means a new title setup.

What transfers cleanly

The interior, mostly. A properly typeset interior PDF (correct trim, adequate margins and gutter, embedded fonts, 300 DPI images) satisfies both platforms with one caveat: IngramSpark expects black-and-white interiors to be genuinely grayscale and color interiors to meet CMYK expectations, where KDP quietly accepts RGB. The safest wide-distribution interior is built to the stricter Ingram spec, which KDP then accepts automatically.

One book, every printer, one upload.

BookDesignerAI delivers per-printer file sets as a matter of course: Cantos, our book-design AI, builds the interior to the strictest common spec plus separate cover files for KDP, IngramSpark, and Lulu, each computed to that printer's own current requirements. Choose what your book needs, check out, and Cantos builds it in the design you pick. Every purchase carries a 100% money-back guarantee for 30 days, and nothing is ever trained on your work.

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Frequently asked questions

Can I use the same book files for KDP and IngramSpark?

The interior usually transfers with minor adjustments, but the covers cannot be shared. IngramSpark requires PDF/X-1a CMYK files built on its generated template with a barcode in the file and total ink under 240%; KDP accepts more file flexibility and adds its own barcode if you leave space. Hardcover geometry differs completely: KDP's case wrap board is wider than the trim while IngramSpark's is narrower, and their spine widths are computed from different tables.

Why do authors publish on both KDP and IngramSpark?

KDP is the direct door to Amazon; IngramSpark distributes to the wider book world including bookstores, libraries, and international retailers through the Ingram catalog. A common setup is KDP for Amazon sales plus IngramSpark for everything else, using your own ISBN so both editions are the same book.

Do I need my own ISBN to publish on both platforms?

Yes. KDP's free ISBN is only valid on Amazon and cannot be used at IngramSpark. To publish the same edition on both, buy your own ISBN (in the US, through Bowker) and use it at both platforms.

Is IngramSpark stricter than KDP about files?

Yes, meaningfully. IngramSpark preflights against PDF/X-1a with CMYK color, a 240% total ink cap, template-exact cover dimensions, and a barcode in the file, and a human technician can stop a title for spec mismatches. KDP tolerates a wider range of PDFs and fixes some issues silently. Files that sail through KDP routinely bounce at IngramSpark.

Sources: Amazon KDP's published print specifications; IngramSpark File Creation Guide (5.11.26) and Trim Size Matrix, current as of July 2026. Related: IngramSpark cover rejections, decoded · The spine width tables · KDP previewer errors