Free KDP tool · no account
KDP Rejection Decoder
Paste the message KDP sent when your book failed review. We match it against the issues KDP reports most often and tell you what each one means and how to fix it.
Want the whole book, not just the numbers?
Describe a book in one sentence and kdpbook.us writes, illustrates and lays it out, then exports the KDP-ready interior and cover. Start with 2,000 free credits, no card.
Frequently asked questions
Is my text stored?
No. The matching runs in your browser and nothing you paste is sent anywhere.
Why does KDP reject books?
The most common reasons are missing bleed, text inside the margins, a spine that doesn't match the page count, a cover size mismatch, low image resolution and an undisclosed AI-generated content declaration.
What if nothing matches?
KDP also uses generic wording. Check your file against the margins and bleed calculator, or contact KDP support with the exact message.
More free KDP tools
KDP Spine Width Calculator
Spine width from page count and paper type, with the spine-text rule.
KDP Cover Size Calculator
Full-wrap cover size in inches, mm and pixels, plus a downloadable template.
KDP Printing Cost Calculator
Print cost per copy and the minimum list price KDP will accept.
KDP Royalty Calculator
Royalty per sale for print and Kindle at any list price.
KDP Trim Sizes
Every standard KDP trim drawn to scale, with page limits.
KDP Margins & Bleed Calculator
Gutter by page count, outside margins and page size with bleed.