How to Brief a KDP Cover: Genre Signals, Thumbnail Legibility, Spine and Bleed

Why the brief matters more than the budget

Most bad covers are not the result of a bad designer. They are the result of a vague brief. “Something eye-catching, modern, you know the genre” produces a cover that looks like nothing in particular. A page of specifics produces a cover that sells.

Whether you are hiring a freelancer or opening a design tool yourself, write the brief first. This guide covers what goes in it.

Start with genre conventions

Readers recognise a genre in under a second by colour, typography and composition. Your cover has to pass that recognition test before anything else about it matters.

Do this before writing a word of the brief:

Open the bestseller list for your primary category (the one you chose when picking KDP categories).
Take a screenshot of the top 20 covers at thumbnail size, in a grid.
Write down what repeats: dominant colours, serif or sans-serif titles, photographic or illustrated, where the title sits, whether there is a person on the cover, how big the author name is.
Note any outliers and whether they rank well in spite of or because of the difference.

Your brief should state the conventions you intend to follow and the one or two places you want to stand out. Standing out in every dimension is the same as being unrecognisable.

Include the screenshot grid in the brief. A designer who sees the shelf designs for the shelf.

The thumbnail legibility test

On Amazon’s search results, your cover is a small rectangle. On a phone it is smaller still. Every cover decision has to survive that.

Write this test into the brief as a requirement:

The title must be readable at roughly 100 pixels wide.
The genre must be obvious at that size without reading the title.
Nothing essential may sit in the bottom corners, where Amazon overlays format badges on some layouts.
The cover must still work in greyscale, because contrast carries legibility more than colour does.

When you receive drafts, shrink them to thumbnail size and view them next to the top-20 grid. If your eye slides past yours, it is not finished.

Typography

Typography is where DIY covers most often fail. Rules to put in the brief:

Two typefaces maximum. One for the title, one for everything else.
No thin or decorative script for the title unless the genre demands it, and even then only with strong contrast behind it.
Title hierarchy. The title is largest, then the author name, then the subtitle or tagline. On non-fiction, the subtitle can be large if it carries the promise.
Contrast over colour. Light text on a dark area or dark on light. Text over a busy photograph needs a solid or gradient panel behind it.
No stretched or squashed type. Scaling a font non-uniformly is immediately visible.
Check the licence. Fonts bundled with design tools are usually fine for commercial use; fonts downloaded from random sites often are not.

Common mistakes to name explicitly so the designer avoids them: centred text with uneven line breaks, a title split so that one word hangs alone, drop shadows on everything, and outlined text as a substitute for real contrast.

Paperback: spine, bleed and the template

An ebook cover is a single image. A paperback cover is a full wrap: back cover, spine and front cover in one file, with bleed around the outside. The brief must say which formats you need, and a paperback brief needs the numbers.

Get the KDP template

KDP provides a cover template generator in its help pages. You enter trim size, page count, paper type and whether the interior is black-and-white or colour, and it returns a template with the exact dimensions, spine width and bleed marked. Download it and attach it to the brief. Do not let a designer guess the spine width.

Because spine width depends on page count, finalise the interior before finalising the cover. A late edit that changes the page count changes the spine.

Bleed

Bleed is the margin beyond the trim line that gets cut off during printing. KDP specifies a bleed amount per side (check the current figure in the help pages). Backgrounds and images must extend to the full bleed edge; text and anything that must not be cut should stay inside the safe area the template marks.

Spine

Text on the spine is only permitted above a minimum page count; below it, the spine should be plain. Confirm the threshold in KDP’s help pages.
Spine text should be small enough to leave a margin on both sides; printing has a tolerance, and tight spine text drifts onto the front or back.
The spine colour should match or deliberately contrast with the front, and the join should not fall on a visible edge of an image.

Barcode

KDP places a barcode on the back cover automatically, in the lower right corner. Leave that area free of text or important imagery.

Resolution and colour

Deliver at 300 dpi at final size. KDP’s help pages state the colour profile and file format they want for print; put that in the brief so the designer exports correctly.

What to include in the brief document

A one-page brief that works:

Title, subtitle and author name, exactly as they should appear.
Genre and primary category, with a link.
The top-20 thumbnail grid and your notes on conventions.
Two or three reference covers you like and why, and one or two you dislike and why.
Formats required: ebook (with KDP’s current pixel dimensions), paperback (with the template attached), and any marketing sizes.
The thumbnail test as an acceptance condition.
Any required elements: series branding, a logo, a tagline.
Deadline and the number of revision rounds.

Compare before you approve

Put the final cover into the top-20 grid at thumbnail size, in the same position every time. Ask one question: would a reader of this category click this? Then ask someone who reads the genre and does not know you.

Next step

Once the cover is approved, the next decision is price, which depends on your format, royalty option and printing cost. Read KDP royalties and pricing explained before you set a list price.