Your cover has approximately 0.3 seconds to stop a thumb from scrolling. In that fraction of a second, a reader decides whether to tap — or keep moving. After designing over 400 book covers, I've seen the same mistakes kill sales again and again. Here are the seven most common, and exactly how to fix every one.
Mistake 1: Using the Wrong Font
Font choice is genre language. A serif font that works beautifully on a literary memoir looks completely wrong on a thriller. A decorative script that works on a romance cover looks amateurish on a business book. Before choosing a font, study the top 20 books in your exact category on Amazon. Notice what they have in common. Your font should feel like it belongs in that company.
Go to Amazon, search your category, and screenshot the top 20 covers. Look at the fonts. That's your design brief.
Mistake 2: Cramming Too Much Text
Subtitle, author name, endorsement blurb, tagline, series name — all fighting for space on a 6×9 cover. At thumbnail size (the only size that matters for discoverability), none of it is readable. The cover becomes visual noise. Your title needs to be the dominant element. Everything else is secondary.
Mistake 3: Wrong Genre Signals
Every genre has visual conventions that readers recognise instantly. Dark moody tones for thrillers. Warm illustrated scenes for children's books. Clean bold typography for business books. Abstract imagery for literary fiction. Break these conventions and your book becomes uncategorisable — readers can't tell at a glance what they're getting, so they move on.
Genre signals aren't a creative limitation — they're a communication tool. The best covers speak the genre's visual language while adding something distinctive enough to stand out within it.
Mistake 4: Using Low-Resolution Images
A cover built on a 72dpi stock photo looks sharp on screen but prints blurry. Print-on-demand requires 300dpi minimum. If your cover images aren't high resolution, your print copies will look unprofessional — and readers notice. Always source images at the highest available resolution and confirm specs with your printer before finalising.
Mistake 5: Poor Contrast Between Text and Background
Light grey text on a white background. Dark navy text on a black cover. These are contrast failures that make your title illegible at thumbnail size. Every text element needs a contrast ratio of at least 4.5:1 against its background. If you're unsure, the WebAIM Contrast Checker is free and takes 30 seconds.
Mistake 6: Designing It Yourself Without Design Training
Canva has made it possible for anyone to make a cover. It has not made it possible for anyone to make a good cover. The difference between a professional cover and a template cover is immediately visible to readers, even if they can't articulate why. For a $300–500 investment, a professional designer gives your book a cover that competes with traditionally published titles.
Mistake 7: Never Testing at Thumbnail Size
Design your cover at full size, then shrink it to 80×120 pixels — the approximate size it appears in Amazon search results. Can you still read the title? Is the image still clear? Does it still look compelling? If the answer to any of these is no, your cover needs revision before it goes anywhere near a listing page.
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