eBook Cover Design Guide: What Actually Sells (2026 Edition)

Every established genre has visual conventions, and they're not arbitrary — they're a compressed signal that lets a browsing reader identify "this is my kind of book" in under a second, before reading a single word of the title.

• Romance: warm color palettes, close-up figures or couples, script or elegant serif titles, soft lighting. Signals emotional, character-driven, intimate.
• Thriller/suspense: high contrast, dark backgrounds, cool tones (blues, blacks, reds as accent), bold sans-serif or condensed type, often a single striking object or silhouette. Signals tension and danger.
• Business/self-help nonfiction: clean typography-forward covers, minimal imagery, high contrast between title and background, often a strong single color. Signals authority and clarity.
• Cozy mystery: illustrated (not photographic) art, bright or pastel palettes, whimsical typography. Signals light tone despite the mystery genre label.
• Fantasy: painterly or illustrated scenes, rich saturated color, ornate or distinctive display typefaces. Signals scope and world-building.

Amazon's search results and "customers also bought" carousels show covers at roughly 100-130 pixels wide. At that size, fine detail disappears completely — intricate illustration, thin script fonts, and subtle color gradients that look sophisticated at full size become mud in a thumbnail.

The test that actually matters: shrink your cover to thumbnail size (roughly 100px wide) and look at it from a normal viewing distance. Can you still read the title? Is there one clear focal point, or does the eye not know where to land? Professional cover designers build this check into their process from the first draft, not as a final QA step — because a composition that needs a redesign to survive thumbnail size is a much bigger fix than a font-size tweak.

• Title contrast beats title cleverness. A title in a beautiful but low-contrast script over a busy background loses to a boring-but-legible sans-serif every time it matters — at thumbnail size.
• Limit to two typefaces maximum: one for the title, one for the author name/subtitle. Three or more reads as amateur regardless of how good each individual font is.
• Author name should be smaller than the title unless you're an established name readers are searching for by name specifically — a debut author's name in large type wastes prime visual real estate that should go to the title and hook imagery.
• Leave breathing room. A title crammed edge-to-edge with no margin looks cramped even before you factor in that platform thumbnails sometimes crop slightly at the edges.

Warm colors (red, orange, warm yellow) read as urgent, passionate, or dangerous depending on context — used heavily in romance and thriller. Cool colors (blue, teal, cool gray) read as calm, intellectual, or clinical — common in literary fiction, science fiction, and business nonfiction. High-contrast black-and-white or black-and-one-accent-color palettes read as serious and modern, a strong default for nonfiction and thrillers alike.

The specific hex values matter less than contrast and consistency with genre expectation. A cover using three or four competing bright colors with no clear hierarchy will almost always underperform a two-color palette with a strong contrast ratio, regardless of which two colors are chosen.

AI cover generation — including the covers getebook.ai builds automatically alongside each generated book — makes producing genre-appropriate artwork fast, but a few failure modes show up often enough to check for specifically: garbled or nonsensical text rendered into the artwork itself (the fix is generating text-free illustrative art and compositing the real title separately, which is what keeps titles crisp and legible), oddly rendered hands or faces in figure-heavy compositions, and overly literal interpretations of abstract book titles that produce a busy, unfocused scene instead of one clean focal point.

The fix for all three is the same: treat AI-generated art as raw material for a composition, not a finished cover. A strong focal point, legible typography layered on top by you or a designer, and a genre-appropriate palette matter more than how the base artwork was produced.