IngramSpark Rejected Your PDF — Here's Why (and the Fix)
IngramSpark's preflight is stricter than Amazon KDP's, so a file that sailed through KDP can still be rejected by Ingram. The top reasons: the PDF isn't declared PDF/X-1a:2001, it contains RGB color instead of CMYK, fonts aren't fully embedded, or transparency isn't flattened. If your file passes IngramSpark it will also pass KDP — but not the other way around.
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Frequently asked questions
Why does IngramSpark reject a file KDP accepted?
KDP accepts RGB and simpler PDFs and converts internally. IngramSpark demands PDF/X-1a:2001 with CMYK color (max ~240% total ink), fully embedded fonts, and flattened transparency. Those extra requirements are what catch authors used to KDP's looser preflight.
What is PDF/X-1a and how do I export it?
PDF/X-1a:2001 is a print-ready PDF standard that forces CMYK, embedded fonts, an output intent, and flattened transparency. Export it with the 'PDF/X-1a:2001' preset in Acrobat/InDesign, or convert an existing PDF with a PDF/X converter.
What's the #1 IngramSpark rejection?
Missing PDF/X-1a compliance — specifically CMYK color and flattened transparency. RGB images and live transparency are the most common culprits.
Does PaperbackKit check for IngramSpark compliance?
Yes — PaperbackKit preflights your interior PDF against IngramSpark's requirements (PDF/X-1a declaration, output intent, RGB objects, transparency, embedded fonts) and lists exactly what fails, so you fix it before uploading.