free tool / pdf checker
● Runs in your browser — nothing is uploaded
Print PDF checker
Drop in the interior PDF you are about to upload. It is checked against KDP's published print requirements, then for layout faults such as widows and orphans. Nothing is uploaded, and no account is needed.
the three most common, or all sixteen
the paper your pages print on
color to the paper's edge
Why interiors get rejected
Many interiors are rejected for something mechanical: a page size that does not match the chosen trim, a font that is not embedded, bleed declared but missing, a page count out of range. None of it shows in a PDF reader, so a failed upload is often the first sign.