Introduction: The ebook formatting mistakes that cause the most trouble on Amazon KDP are a broken or missing table of contents, manual page breaks and spacing that fall apart when text reflows, page numbers or headers carried over from a print file, low resolution or linked images, and cover files with the wrong size or type. Some of these get a book rejected outright. Others let the book upload but leave it looking broken on a reader’s Kindle, which leads to quality warnings, refunds, and bad reviews. Each mistake has a simple fix, and most take less than an hour to correct.
This guide is for authors who format their own ebooks, or who have received a rejection or quality notice from KDP. Use it as a final check before you upload, or as a troubleshooting list after a rejection.
Quick Summary
Ebooks reflow, which means text adjusts to each reader’s screen size and font choice. Formatting that works in a Word document often breaks under that reflow. The eight most common ebook formatting mistakes are a table of contents that does not link, manual page breaks and extra spaces, print layout elements like page numbers, the wrong file type or the right file in the wrong upload slot, images that are linked or blurry, cover files that miss the size requirements, metadata that does not match the cover, and typos or external store links. Fix them by building your file from heading styles, exporting a clean EPUB, and checking it in Kindle Previewer on both phone and tablet views.
Why Ebook Formatting Mistakes Matter Even If KDP Accepts Your File
Short answer: A file can upload successfully and still look broken on a Kindle, so formatting errors hurt you through quality warnings, refund requests, and reviews, not only through rejections.
Guides on KDP troubleshooting make the same point again and again. Most formatting mistakes are invisible to the author but obvious to the reader. A missing table of contents or a stray page number shows up in reviews, and clean formatting signals professionalism. That is why a formatting check belongs in your process even when your upload goes through without an error message.
The Ebook Formatting Mistakes That Cause the Most Problems
Mistake 1: A Broken or Missing Table of Contents
Short answer: A table of contents that does not link is one of the most common causes of rejection and reader complaints, and the usual cause is formatting chapter titles by looks instead of by style.
Kindle readers expect to tap a chapter title and jump straight to it. A list of chapter names typed as plain text is decoration, not a table of contents. The cause is almost always large or bold text used instead of proper heading styles. The fix is to format every chapter title as Heading 1 in your word processor before you export, since the EPUB builds its navigation from heading styles and not from text that merely looks like a heading. KDP guides also flag ebooks that lack a navigable table of contents.
Mistake 2: Manual Page Breaks, Tabs, and Blank Lines
Short answer: Pressing Enter repeatedly, adding tabs, or stacking manual page breaks creates blank pages and odd spacing, because ebook text reflows and manual spacing does not.
Common causes include extra paragraph marks, manual page breaks stacked on top of automatic chapter breaks, and section breaks that conflict with the EPUB’s own chapter structure. Use your software’s chapter break or page break style instead. Replace tabs and multiple spaces with paragraph indents set in the style settings.
Mistake 3: Print Layout Elements in an Ebook
Short answer: Page numbers, headers, and footers belong in print books, and a print PDF converted into an ebook is a classic cause of Kindle quality problems.
KDP’s ebook formatting guidance says not to use headers, footers, or page numbers in an ebook. A print page number stranded in the middle of a sentence is a critical quality issue. If you only have a print PDF, rebuild the interior as a reflowable EPUB or DOCX file instead of converting the PDF.
Mistake 4: The Wrong File Type or the Right File in the Wrong Slot
Short answer: Each KDP upload slot takes one kind of file, so a paperback cover in the ebook slot or a PDF as your manuscript can trigger a rejection.
In 2026, EPUB is the preferred ebook format, and one KDP guide lists MOBI as deprecated. A paperback sized cover uploaded as the Kindle ebook cover is another common error. The paperback slot wants a full wrap PDF, while the Kindle cover slot wants the front cover as an image file.
Mistake 5: Images That Are Linked, Blurry, or Too Small
Short answer: Images must be embedded in the file, not linked, and they should be sharp enough to look clean on a high resolution screen.
Broken image links can cause upload failures. Blurry images and low resolution graphics can trigger quality warnings. One checklist recommends at least 300 DPI for photographs and a minimum of 72 DPI for simple graphics. If your EPUB contains WEBP images, convert them to JPEG or PNG before you embed them.
Mistake 6: Cover File Problems
Short answer: Your ebook cover must meet KDP’s current size and format requirements, and it should not carry pricing or promotional text.
Guides describe the ideal ebook cover as 2,560 pixels tall and 1,600 pixels wide, a 1.6 to 1 ratio, saved as a JPEG or TIFF. Sources state the exact minimums slightly differently, so confirm the current requirement shown in your KDP dashboard. Remove any price, the word free, or promotional claims from the cover, since KDP may reject them. Make sure you set the file as the ebook cover and do not only embed it as page one.
Mistake 7: Metadata That Does Not Match the Cover
Short answer: The title, subtitle, and author name on your cover should match what you enter in the KDP dashboard exactly.
A mismatch is a simple and common reason for rejection. Other metadata mistakes include stuffing keywords into the title or subtitle, using another author’s name as a keyword, claiming bestseller status or awards you have not earned, and putting a price in the title.
Mistake 8: Typos, Scans, and External Store Links
Short answer: KDP quality checks flag spelling errors, entire scanned pages, and links to other ebook stores.
Typos are among the most common quality issues readers report. A professional proofread catches them, and our guide to developmental editing, copy editing, and proofreading explains when to book each stage. Remove any links that send readers to competing stores before you upload.
Ebook Formatting Mistakes at a Glance
| Mistake | What Goes Wrong | The Fix |
| Table of contents does not link | Readers cannot navigate, KDP may flag it | Use Heading 1 for every chapter title |
| Manual breaks and spaces | Blank pages and odd spacing on reflow | Use chapter break styles and paragraph indents |
| Page numbers and headers | Stray numbers appear mid sentence | Remove them and use a reflowable file |
| Wrong file or slot | Upload rejected | Upload EPUB or DOCX, and the right file per slot |
| Linked or blurry images | Upload errors or quality warnings | Embed sharp images in JPEG or PNG |
| Cover size or text issues | Cover rejected | Follow dashboard specs, no price or promo text |
| Metadata mismatch | Rejection for inconsistent information | Match cover and dashboard exactly |
| Typos and external links | Quality notices | Proofread and remove store links |
How to Format an Ebook for KDP Step by Step
Follow this order to avoid most of the mistakes above.
- Finish your edits first, so you do not reformat after every change.
- Apply a clean style set. Use Heading 1 for chapter titles and a single body style for text.
- Remove manual page breaks, extra paragraph marks, tabs, and multiple spaces.
- Delete page numbers, headers, and footers.
- Embed every image and check its resolution.
- Export a reflowable EPUB, and choose UTF-8 encoding if your converter asks.
- Open the file in the free Kindle Previewer. Confirm the table of contents works and check phone and tablet views.
- Check your cover file against the dashboard requirements, and match your title and author name to your metadata.
- Upload, then use the KDP previewer one more time before you publish.
Want a clean, KDP ready ebook file without the troubleshooting? See our book formatting services.
Ebook vs Print: Do Not Reuse One File
Short answer: Ebooks and print books follow different rules, so build a separate file for each instead of converting one into the other.
Print files deal with trim size, margins, bleed, embedded fonts, and spine width. Ebook files must reflow. Reusing a print interior as an ebook is what produces stranded page numbers and fixed layouts. Treat them as two builds from the same edited manuscript.
Tools That Help
The free Kindle Previewer is the most important checking tool, since it shows how your book looks on different devices. Word processors with proper style sets can produce a clean EPUB when you use heading styles consistently. Dedicated formatting tools such as Vellum or Atticus can save time on a series or a complex layout. Whatever you use, always preview the result, since software can still produce a broken table of contents if the styles underneath are wrong.
Common Mistakes When Fixing Formatting Errors
Many authors patch problems with extra spaces and line breaks, which creates new problems on reflow. Others test on one device only and miss errors on a phone. Some reuse an old cover file without checking the current specs. A fourth mistake is ignoring the details in KDP’s rejection message. Read the exact wording, since it usually names the problem. Fix the cause in your source file, then export again instead of editing the exported EPUB by hand.
Frequently Asked Questions
What file format should I upload to KDP for an ebook?
EPUB is the preferred ebook format in 2026, and DOCX is also accepted. One 2026 KDP guide lists MOBI as deprecated, so confirm the current accepted formats in your dashboard.
Does my ebook need a table of contents?
A linked table of contents is expected for a good reader experience, and guides report that KDP flags ebooks without a navigable one. It is especially important for nonfiction.
Why does my ebook look different on Kindle than in Word?
Ebooks reflow to fit each screen and font setting. Manual page breaks, tabs, and blank lines that look fine in Word break under reflow.
Can I include page numbers in my ebook?
No. KDP’s ebook formatting guidance says not to use headers, footers, or page numbers, and a stranded print page number is a critical quality issue.
What size should my ebook cover be?
Guides describe the ideal as 2,560 pixels tall by 1,600 pixels wide, a 1.6 to 1 ratio, in JPEG or TIFF. Confirm the exact requirement in your KDP dashboard.
How can I test my ebook before publishing?
Open it in the free Kindle Previewer and check phone and tablet views. Then use the KDP previewer after you upload.
Conclusion
Ebook formatting mistakes are some of the most preventable problems in self publishing. Build your file from heading styles, remove manual spacing and print elements, embed sharp images, check your cover and metadata, and preview the finished EPUB on both phone and tablet views. A clean file protects you from rejection, quality notices, and reviews that complain about a broken reading experience. Always confirm current requirements in your KDP dashboard, since specifications can change.
