Common Interior Formatting Mistakes That Get Manuscripts Rejected

Most upload rejections and amateur-looking books come down to a short list of avoidable formatting mistakes. Here are the ones that trip up authors most, and exactly how to fix each.

A reader rarely notices good formatting, but they always feel bad formatting, even if they can't name what's wrong. And retailers will outright reject files that miss technical specs. The encouraging news is that nearly every formatting problem comes from the same short list of mistakes. Avoid these and your book both uploads cleanly and reads like a professional release. (For the full KDP spec, pair this with our KDP formatting checklist.)

1. Faking Layout With Spaces, Tabs, and Empty Paragraphs

This is the root cause of more formatting problems than any other single mistake. Using the spacebar to indent paragraphs, tabs to position text, or rows of empty paragraphs to push a chapter heading down the page works on your screen, but it breaks completely in a reflowable ebook, where text resizes. Always use proper paragraph styles for indents and spacing, and real page breaks between chapters.

If you've ever pressed Enter several times to start a new chapter on a fresh page, that's the habit to break. Use an actual page break instead.

2. Inconsistent Fonts and Headings

Mixing fonts, sizes, and heading styles makes a book look amateur instantly. Every chapter title should use the same style; body text should be one consistent font and size throughout. The fix is to define styles (Chapter Title, Body, etc.) once and apply them everywhere, rather than formatting each element by hand and inevitably drifting.

3. Wrong Margins and Bleed for Print

The most common hard rejection. Print books need an inside (gutter) margin that grows with page count, and bleed only if images run to the page edge. Too-narrow gutters make text disappear into the spine; missing or misapplied bleed triggers rejection. Match your margins to your final page count and apply bleed only when your content actually needs it.

4. Orphans and Widows

A widow is a lone last line of a paragraph stranded at the top of a page; an orphan is a lone first line stranded at the bottom. Both leave awkward gaps and signal amateur typesetting. Most word processors have a "widow/orphan control" setting, turn it on, and adjust manually where needed so paragraphs break cleanly.

5. Low-Resolution Images

Images that look fine on screen at 72 dpi turn blurry and pixelated in print, which needs 300 dpi. This is a frequent rejection cause for illustrated books and a quality-killer even when it slips through. Always use 300-dpi images sized for their final print dimensions; never enlarge a small image to fill space.

6. Missing or Misordered Front Matter

Skipping the copyright page, omitting a title page, or scrambling the conventional order makes a book read as unprofessional. Include the standard front matter in the standard sequence (title, copyright with ISBN, dedication, table of contents), and always include a proper copyright page.

7. Broken or Missing Table of Contents (eBooks)

Ebook readers expect a working, linked table of contents they can navigate from. A TOC built by hand (typed page numbers) is meaningless in a reflowable ebook and a frequent rejection trigger. Generate a proper linked/logical TOC from your heading styles, another reason styles matter.

8. Inconsistent Paragraph Styling

Mixing first-line indents with block paragraphs, or varying spacing between paragraphs, looks careless. Pick one convention, fiction almost always uses first-line indents with no extra space between paragraphs; some non-fiction uses block style, and apply it consistently throughout.

Quick-Fix Reference Table

Notice how many fixes come back to one principle: format with styles, not by hand. Master that and most of this list takes care of itself.

How to Catch These Before You Upload

• Preview your ebook on multiple device sizes using the retailer's previewer.
• Print a physical proof copy of your paperback and read it, problems jump out on paper.
• Check every chapter starts on a fresh page via a real page break.
• Confirm images are 300 dpi at their printed size.
• Verify the linked TOC navigates correctly in the ebook.

Professional formatting is mostly about discipline: use styles instead of manual spacing, size your margins to your page count, keep images at print resolution, and follow front-matter conventions. Avoid the mistakes on this list and your book uploads cleanly and reads like it came from a major publisher. Still deciding which file formats you need? See EPUB vs MOBI vs PDF.