Common Manuscript Formatting Mistakes to Avoid

You can write a wonderful book and still have it read as amateur the moment someone opens the file — because formatting is the first thing a reader, an agent, or a KDP reviewer sees. The good news: nearly every formatting problem comes from a short list of avoidable habits. Fix these and your manuscript instantly looks like it was made by a professional.

Mistake 1: Formatting with the spacebar, Tab, and Enter

This is the big one, and it causes most of the others. Creating indents with Tab, spacing with repeated Enters, and centering with the spacebar looks fine on your screen and shatters the instant the file is converted for Kindle or opened on another machine. Use paragraph styles for indents and spacing, and real page breaks between chapters. Set it once in the style; never type it.

Mistake 2: Double spaces after periods

The two-spaces-after-a-period habit is a typewriter relic that modern typesetting doesn’t use, and it creates uneven “rivers” of white space in justified text. Do a find-and-replace of two spaces with one across the whole manuscript. It takes ten seconds and it’s one of the clearest tells of an untrained file.

Mistake 3: Wrong or inconsistent margins and gutter

For print, a too-narrow gutter (the inside margin) means text disappears into the spine, and margins that don’t match KDP’s minimums get the file rejected. The gutter needs to grow with page count. Set margins to your trim size’s requirements rather than leaving Word’s defaults, which are built for letter-size documents, not books.

Mistake 4: A missing or broken table of contents

An eBook without a clickable, linked table of contents — or one that jumps to the wrong places — is a frequent source of one-star “formatting” reviews. Build the TOC from proper heading styles so it generates and links correctly, and always test every link in the previewer.

Mistake 5: Fonts that won’t embed or render

• Print: export a PDF with all fonts embedded, or KDP may substitute or reject your file.
• eBook: don’t hard-code exotic display fonts for body text — readers control the font on Kindle, and forcing one often backfires.
• Both: stick to one or two clean, readable typefaces. Multiple fonts scream amateur.

Mistake 6: Inconsistent everything

Mixed chapter-heading styles, wandering paragraph indents, curly quotes in one place and straight quotes in another, and consistency errors in names and spelling all pile up into a sloppy impression. A style sheet — even a simple one — keeps these uniform, and it’s exactly the kind of thing a copyeditor tracks for you.

Mistake 7: Skipping the previewer

The final mistake is not checking. KDP’s Online Previewer is free and shows you exactly what readers will see. Walk every page for print; change font sizes for eBook. Most formatting disasters that reach readers were fully visible in the previewer and simply not looked at.

The simplest fix of all

If this feels like a lot to track, it is — and it’s why professional formatting is inexpensive relative to the impression it protects. Whether you do it yourself or hand it off, the goal is the same: a file so clean the reader never thinks about formatting at all, and simply reads your book. For the full specs, see book formatting for KDP.