Book cover design that still works when it is small
By the 360book team · 10 October 2026 · 4 min read
In a bookshop a cover is seen at full size from an arm’s length away. Online it is first seen about three centimetres tall, in a grid of other covers, on a phone. A design that looks handsome on your monitor can turn into a grey smudge at that size. You do not need to be a designer to avoid this. You need to check a few things.
1. Do the thumbnail test first
Shrink your cover until it is about 150 pixels wide, or simply hold your phone at arm’s length. Can you read the title? Can you tell what kind of book it is? If either answer is no, nothing else about the design matters yet. Repeat this test after every change.
2. Make the title large
The title should usually fill most of the cover’s width, and on a small cover it will still only be a few millimetres tall. Two or three short lines of large type work better than one long line of small type. Subtitles and taglines will not be readable in a thumbnail, so do not let them crowd the title.
3. Choose contrast over subtlety
Light type on a dark background, or dark on light. Mid-grey text on a mid-blue photograph disappears. If the title sits on top of a photograph, put it over the calmest part of the image or lay a plain band of colour behind it. A simple check is to turn the cover into black and white: if the title is hard to find, the contrast is too low.
4. One image, one idea
A single clear object or shape reads at any size. A detailed scene with five characters does not. Many of the most recognisable covers use little more than one bold shape. The covers of the classics on this site follow the same idea, each using one simple emblem, such as an hourglass for The Time Machine and a pocket watch for Alice’s Adventures in Wonderland.
5. Limit yourself to two typefaces
One for the title and one for everything else is enough. Pick faces that suit the genre: serif type suggests literary fiction and history, clean sans-serif suggests thrillers, business and science. Avoid thin, light weights and elaborate scripts for the title, because fine strokes vanish when the cover is small.
6. Let the genre show
Readers use covers to sort books in a fraction of a second. A romance, a crime novel and a cookbook each have a look, made from colour, type and image. You do not have to copy the conventions, but if your cover sends the wrong signal you will attract readers who did not want your book and lose the ones who did. Look at twenty current covers in your genre and note what they share.
7. Leave room at the edges
Keep the title and author name clear of the outer edge by a comfortable margin. Covers get trimmed in printing, cropped by websites and, on a 3D book, wrapped around the boards. Text that touches the edge looks cramped everywhere and may be cut off somewhere.
How covers behave on 360book
Your cover is fitted to the page shape of the book design you choose, which for most designs is three units wide by four tall. An image with different proportions is cropped to fit, so start with a file in that shape if you can; 1500 by 2000 pixels is plenty. The cover is then compressed to keep the page fast.
The spine is generated for you from the title and the colour you pick, so choose a board colour that matches the edge of your cover art. A back cover is optional. If you add one, keep it simple: the description, or a single line from the book.
Because the book can be turned in 3D, light moves across the cover. Very dark covers with dark text lose detail when the book is angled away, which is one more reason to favour strong contrast.
If you are not making it yourself
A professional cover is the one expense most self-published authors say was worth it. When you brief a designer, send three covers you admire in your genre, the exact title and author name, the trim size, and a request to see the design at thumbnail size as well as full size. Make sure you have the right to use any photograph or illustration: buying a print or finding an image online does not give you permission to put it on a book.
When the cover is ready, the publishing guide shows where to upload it.