Shelfie — see your book cover at store thumbnail size

Add your cover Your current design or a draft.
Add comps Up to 11 bestsellers you'll sit next to.
Check it small Switch sizes, squint, and read the scores.

Sizes are approximate CSS pixels; stores change layouts. Match the slider to what you see on your own screen.

Contrast

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Add your cover to measure how much light–dark contrast survives at phone size.

Title legibility

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Title sits at

Measures edge sharpness in the title band at phone size.

Stand-out

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Add comps to compare your colours with the covers around you.

Scores are quick heuristics from pixels, not a substitute for asking readers.

For your own review. It includes other authors' covers, so please don't post it.

Will my cover work as a thumbnail?

Most readers first see your book as a small rectangle in a search grid, next to a dozen others in the same genre. A cover that looks great full-size can turn into a blur at that scale. These are the questions Shelfie helps you answer before launch.

Can the title be read at phone size?

On a phone, a search result thumbnail is roughly a hundred pixels tall. Thin serif or script titles, long subtitles and low-contrast lettering are the first to disappear. Switch to Phone search and look at the title band score.

Does it hold up in grayscale?

Grayscale removes colour and shows you the light and dark shapes underneath. If the title and the main image merge into one tone, shoppers scrolling quickly will not see them either.

Why squint?

Squinting is an old designer's trick: blur the cover and see what's left. The blur mimics a quick glance down a page of results. A strong cover still shows one clear shape and a readable title block.

Does it fit the genre without blending in?

Readers use genre cues to find books like the ones they love, so a cover should look like it belongs. It should also not be a twin of the covers around it. The stand-out score compares your colours with your comps and names the closest one.

Are the sizes exact?

No. The presets are approximate, and stores change their layouts often. Use the height slider to match what you see on your own screen.

What happens to my files?

Nothing leaves your browser tab. The lineup export includes other authors' covers, so it's for your own review only. The A/B share card shows only your two versions, never comps.

See your cover the way shoppers will.