The front cover gets a reader to pick the book up. The back cover decides whether they carry it to the till. In a bookshop a browser turns the book over within seconds; online, the reader sees the description on the product page instead, but the printed back cover still matters for every physical sale, every signed copy and every shelf. A good back cover has a clear blurb, a quiet background, a place for the barcode and, often, a short author bio. This guide explains what goes on a back cover, how to write the blurb, how to handle the barcode area, how to choose a background that matches the front, and how to build all of it in Quillen's paperback cover editor.
The short answer
Put a short, punchy blurb (100 to 150 words) at the top of the back cover, an optional line of praise or a tagline above it, an optional author bio and photo below, and leave the bottom right corner clear for the barcode. Match the background to the front, keep the text inside the safe area, and keep contrast high. In Quillen, the paperback cover editor has back cover templates, a barcode placeholder, a smart-background option and auto text colour, all in the left panel.
What goes on a back cover
| Element | Purpose | Notes |
|---|---|---|
| Tagline or hook | One line that sells the premise | Optional, above the blurb |
| Blurb | Summarizes the story or promise | 100 to 150 words; ends with a question or a stake |
| Review quotes | Social proof | Only real ones, with sources |
| Author bio and photo | Connects the reader with you | Short; photo optional |
| Barcode area | Reserved for the ISBN barcode | KDP adds the barcode itself unless you supply one |
| Price and publisher mark | Optional trade details | Only if you have them |
Writing the blurb
The blurb is the part that does the selling, and it should be about the reader's experience, not a synopsis. A reliable structure for fiction is: the character and their world, the disruption, the stakes, and a closing line that makes the reader want to open the book. For nonfiction: the reader's problem, what the book offers, and what they will be able to do. Avoid spoilers, avoid more than two or three names, and cut anything that does not raise a question.
An example for Hollow Crown: "When a drowned crown surfaces in her net, ferrywoman Wren has one night to decide: sell it to a stranger, or follow it into the flooded valley the maps forgot. A river story about crossings, curses and the price of courage."
The same text, written once, can serve as your retailer description. See our self-publishing checklist for the rest of the metadata you need.
The barcode area
Every printed book needs a barcode area on the back cover, usually in the lower right corner. KDP will add its own barcode if you leave a blank space of the right size, 2 by 1.2 inches. Keep that area completely clear of text and busy images, because a barcode needs a clean background to scan. Do not put your own barcode in unless you have a real ISBN and know how to produce a valid one.
Safe area and bleed
Printing trims the cover after it is printed, so the edges can shift by a small amount. Background colour and images should run past the trim line into the bleed area (0.125 inch beyond the trim for KDP), and all text should sit inside the safe area, at least 0.125 inch inside the trim. Text outside it risks being cut off. Spine text needs room too, with a margin from the fold. The cover editor draws these guides for you.
Matching the background to the front
A back cover should feel like the other side of the same book. The simplest approach is to use the same background colour or the same image, softened. If the front has a strong photograph, a plain colour sampled from it makes a clean back. A blurred version of the front image can work too, with a dark overlay so the blurb is readable. Avoid an unrelated pattern, and avoid putting body text over a busy detail.
Making the blurb readable
- Contrast first. Light text on a dark background or dark on light, never mid-tone on mid-tone.
- Size. Blurb text at 10 to 12 points reads comfortably in print.
- Line length. Keep lines short enough to scan, with generous margins.
- Left align. Centred paragraphs of body text are harder to read.
- Whitespace. Let the blurb breathe: a cluttered back cover looks amateur.
Common mistakes
| Mistake | Problem | Fix |
|---|---|---|
| A blurb that is a synopsis | Reads like homework | Hook, stakes, question |
| Text over a busy image | Illegible | Darken or blur the background |
| Covering the barcode area | KDP cannot place the barcode | Keep the 2 by 1.2 inch area clear |
| Text outside the safe area | Trimmed in print | Stay inside the guides |
| Unrelated back and front | Looks like two books | Match the background |
| A bio longer than the blurb | Overshadows the story | Two or three sentences |
Do it in Quillen
Quillen's paperback cover editor lays out the whole wraparound cover (back, spine and front) with print guides, and builds the back cover from templates.
- Open the editor. Click Cover in the header and choose Paperback cover.
- Set up the book. In the left panel, check the trim size, paper type and page count, which determine the spine and the full cover width.
- Scroll to Back cover. Under Template, choose None, Back description only, Description + author bio or Description + bio + author photo.
- Fill in the text. Type the blurb in Description and the bio in Author bio. The text sizes itself to fit and the layout re-flows as you type.
- Look at the barcode area. A grey "KDP barcode area" box in the lower right corner of the back cover marks the space to keep clear.
- Set the background. Choose a colour, or click Match background to image, or pick a Smart background style once you have a front image: blurred image, colour mesh, aurora or bokeh, with softness and darken sliders. Leave Auto text colour (back and spine) ticked so the text stays readable.
- Check the guides. Red marks the trim and bleed, green the safe area, and blue the spine folds. Keep all text inside the green.
- Export. Click Export print PDF. The file is a flattened RGB PDF at 300 DPI, which KDP converts to CMYK when printing.
Checklist
- A blurb of 100 to 150 words that raises a question.
- Contrast high, text left-aligned, margins generous.
- The 2 by 1.2 inch barcode area left clear.
- All text inside the safe area.
- Background matched to the front cover.
- Spine and page count checked after the interior is final.
Common questions
What goes on a back cover?
A short blurb, optionally a tagline, review quotes and an author bio and photo, plus a clear area for the barcode.
How long should a blurb be?
About 100 to 150 words: the character, the disruption, the stakes and a closing line that makes the reader want to open the book.
How big is the barcode area?
KDP's barcode area is 2 by 1.2 inches, usually in the lower right of the back cover. Keep it clear of text and busy images.
What back cover templates does Quillen have?
None, Back description only, Description plus author bio, and Description plus bio plus author photo. Text sizes itself to fit.
Can I make the back match my front cover automatically?
Yes. Quillen has Match background to image and a smart background option with blurred image, colour mesh, aurora and bokeh styles, plus auto text colour for the back and spine.