Almost every KDP rejection is preventable, and almost none of them are mysterious. They cluster around a small number of checks that take minutes before uploading and days to resolve afterwards — because once a title is in review, you are waiting on a queue rather than fixing a file.
This article is a pre-flight process rather than a catalogue. If you have already been rejected and want to identify the cause from the message you received, KDP rejection reasons and how to fix them works through the causes individually. What follows is what to verify before you upload, so you do not need that article.
What this guide covers
- Why review exists and what it is looking at
- Interior checks
- Cover checks
- Metadata checks
- Content and rights checks
- The low-content misunderstanding
- If you are already rejected
- Pre-upload checklist
- Frequently Asked Questions
Why review exists and what it is looking at
Every title goes through a review before it goes on sale. The review is checking whether the files will print acceptably, whether the metadata describes the book honestly, and whether the content and rights are in order. It is not judging whether the book is good.
That framing is useful, because it tells you where to spend your attention. A beautifully written book with a spine calculated from the wrong page count will be held; a modest book with correct files will not.
Amazon publishes the guidelines the review works from in KDP Help, and they are worth reading once in full rather than consulting after a problem.
Interior checks
The interior causes more holds than anything else, and the same handful of issues recur.
Margins below the minimum. Amazon publishes minimum margins, and the inside margin increases with page count. A file laid out for 80 pages and then extended to 140 without revisiting the gutter will have content too close to the spine.
Content in the bleed zone. If you enabled bleed, anything important within the trimmed area may be cut. If you did not enable bleed but artwork reaches the page edge, you will get white slivers.
Low-resolution images. Print needs 300 DPI at the printed size. Images that look sharp on screen frequently are not, because screen display is far less demanding.
Page count mismatch. The page count in your interior file must match what the cover was built for, because the spine width depends on it.
Fonts not embedded. If fonts are not embedded in the PDF, they may substitute, changing the layout.
Open the exported PDF and look at it before uploading. Check the first page, the last page and a spread in the middle. The formatting mechanics behind these checks are covered in how to format a book for Amazon KDP, and if your file is too large to upload, compress the PDF rather than resampling images — the PDF Compressor does that without softening line art.
Cover checks
Cover problems are less common but more frustrating, because a wrong spine means regenerating the whole wrap.
Spine width calculated from the wrong page count. Spine width depends on both page count and paper type. Changing either after building the cover invalidates it. Recalculate with the Spine Width Calculator whenever the interior changes, and see the spine width calculator for why paper stock matters.
Text too close to the trim edge. Cover trimming has the same tolerance as interior trimming. Titles set close to the edge risk being clipped.
Spine text on a thin book. Below a certain thickness there is not enough spine to print on reliably. Amazon states the threshold in its cover guidelines.
Low-resolution cover artwork. Covers are the most-viewed image you produce and the most commonly supplied at screen resolution.
Building the cover on a correctly sized canvas from the start avoids most of this — the KDP Cover Generator sets the wrap dimensions for your trim and spine. For the design side, cover design tips covers what works at thumbnail size.
Metadata checks
Metadata problems are the easiest to avoid and the most self-inflicted.
Keyword stuffing in the title. The title field is for the title. Packing search terms into it is a guidelines violation, not a growth tactic.
Claims that cannot be substantiated. "Bestselling" when it is not, or "official" when it is not, will be flagged.
Other people's names as keywords. Using an author or brand name to catch their traffic is a rights issue.
A description that misrepresents the book. A description promising content the book does not contain causes both rejection and returns.
Wrong categories. Placing a book where it does not belong to find a smaller category is visible and counterproductive.
The seven backend keyword slots exist precisely so you do not have to distort the title. Fill them deliberately with the 7 Backend Keywords Tool, and use the KDP Metadata Optimizer to keep the title, subtitle and description each doing their own job. KDP keyword research covers how to choose the terms.
Content and rights checks
Confirm you hold the rights to everything in the book — text, images, fonts and any quoted material. Public domain status varies by territory and is worth verifying rather than assuming.
If any part of the content was produced by an AI tool, answer the disclosure question when you publish. That is a separate matter from rights, and declaring is not a rejection trigger — the AI content rules covers where the line falls.
Public domain works have their own requirements around differentiation, published in KDP Help.
Publishing in batches without repeating a mistake
Publishers producing a series hit a specific version of this problem: an error in the template propagates across every title before anyone notices.
If your first coloring book has a gutter set for the wrong page count, and books two through eight reuse that template, all eight carry the fault. The rejection of book one is annoying; discovering it after eight are live means eight interiors to rebuild and eight covers to recalculate.
The practical defence is to treat the first book in a series as a proof. Get it through review, order an author copy, hold it, and only then build the rest on that template. The delay feels expensive and is far cheaper than the alternative.
It is also worth re-checking the template whenever page count changes, because the gutter requirement moves with it. A series where every book is a different length cannot share one margin setting, even though it shares everything else.
Why repeated rejections matter beyond the individual book
A single rejection is a file problem. A pattern of them is a different kind of problem, because it suggests a process that is not checking anything before upload.
This is the practical argument for a pre-flight routine even when it feels unnecessary. Each rejection consumes a review cycle, and resubmitting repeatedly with small speculative changes consumes several. A publisher who checks four things before uploading spends minutes; a publisher who uploads and waits spends days per iteration, and iterates more.
Keep your own record of what caused each hold. Across a catalogue, the same cause tends to recur, and knowing which one is yours is more useful than any general list — including this one.
The low-content misunderstanding
A persistent belief in the self-publishing world is that coloring books and puzzle books are automatically "low-content" and therefore subject to different rules. Amazon does not generally classify them that way, and building your process around that assumption leads to bad decisions — most often, skimping on the interior because it is "only" low-content.
The practical consequence is simple: produce these books to the same standard as anything else. The formatting requirements are identical, the review is the same review, and the quality bar readers apply is if anything higher, because the interior is the product. Low-content book ideas covers the category itself.
Order the proof before you promote
Passing review means your files met the requirements. It does not mean the book reads well in the hand, and those are genuinely different questions.
An author copy surfaces things no on-screen check will: type that is comfortable at 100% zoom and cramped on paper, line art that looked black and prints grey, a gutter that is technically compliant and practically unusable, and a cover whose contrast collapses under matte lamination.
The cost of ordering one is small against the cost of discovering any of these through a review. It is also the only way to check the physical experience of the specific book type you are producing — a coloring book you cannot flatten and a puzzle book you cannot write in are both compliant and both defective.
Hold the promotion until the proof is in your hands. A title that goes live and then needs its interior replaced loses the early reviews that the replacement was supposed to earn.
If you are already rejected
Read the message carefully and identify which of the four areas above it concerns. The messages are more specific than they first appear, and the instinct to resubmit immediately with small changes wastes the most time — each resubmission goes back into the queue.
Fix the actual cause, verify it, and resubmit once. If the message genuinely is unclear, contact KDP support and ask which requirement the title failed rather than guessing across several uploads.
Pre-upload checklist
- Exported PDF opened and inspected — first page, last page, and a middle spread.
- Inside margin checked against Amazon's table for the final page count.
- Bleed setting matches the artwork: on if anything reaches the edge, off if not.
- Every image confirmed at 300 DPI at its printed size.
- Fonts embedded in the exported file.
- Cover spine recalculated from the final page count and paper type.
- No cover text near the trim edge; spine text only if the book is thick enough.
- Title field contains the title, not keywords.
- No unsubstantiated claims anywhere in the metadata.
- No third-party author or brand names used as keywords.
- Description accurately describes what is inside.
- Categories chosen honestly.
- Rights confirmed for text, images, fonts and quotations.
- AI disclosure answered if any content was AI-generated.
Frequently Asked Questions
Why was my book blocked during review?
Most holds come from interior formatting, cover dimensions, metadata that breaches guidelines, or a rights question. The message names the area — read it before resubmitting, since each resubmission re-enters the queue.
How long does KDP review take?
Amazon states current review times in KDP Help. It varies, so check there rather than relying on a figure quoted in a guide.
Can I fix and resubmit a rejected book?
Yes. Correct the specific issue named, verify the fix in the exported file, and resubmit once. Repeated small resubmissions cost more time than one careful correction.
Does keyword stuffing really cause rejection?
Packing search terms into the title field breaches the metadata guidelines. The seven backend keyword slots exist so that the title does not have to carry them.
Are coloring books and puzzle books treated as low-content?
Amazon does not generally classify them that way. Produce them to the same standard as any other book; the formatting requirements and the review are the same.
Do I have to declare AI-generated content?
Yes, when content was created by an AI tool. Declaring is not a rejection trigger, and it does not appear on your product page.
My file is rejected for image resolution but it looks sharp. Why?
Screens display around 72 pixels per inch; print needs 300 DPI at the printed size. An image can look perfect on screen and be well below the print requirement.
Minutes before, days after
The asymmetry is the whole argument for a pre-flight routine. Opening your PDF and checking three spreads takes a few minutes. Discovering the same problem through a rejection costs the review cycle, the fix, and a second review.
For the metadata half of the list, the KDP Metadata Optimizer keeps titles, descriptions and keywords inside the guidelines while still being searchable. Once a book is live, the KDP Book Tracker follows how it performs over time.