To write a book blurb, open with one hook line that names the main character and the thing that is about to go wrong, add two or three short paragraphs that set out what they want, what stands in their way and what they stand to lose, then finish on a question or tagline that makes the reader need the answer. Keep it to roughly 100-200 words, signal your genre in the first two lines, and never give away the ending.

This guide includes a few product links near the end. As an Amazon Associate, Freyja Publishing earns from qualifying purchases, at no extra cost to you.

This guide gives you a simple four-part formula, shows how it changes for romance, thriller, fantasy, cosy mystery and non-fiction, walks through a before-and-after rewrite, and covers the Amazon-specific details most blurb guides skip: the KDP description editor, the 4,000-character limit, the HTML it accepts and the things Amazon does not allow in a description at all.

At a glance

• A blurb is a sales pitch, not a summary. Its only job is to make the right reader click “Read sample” or “Buy now”.
• Use four parts: hook, set-up, stakes and complication, then a closing question or tagline.
• Genre signals come first. Readers decide in seconds whether a book is “for them”, so tropes, tone and setting belong in the opening lines.
• Short wins. KDP’s own help suggests about 150 words with short, scannable sentences; the hard limit is 4,000 characters including HTML tags.
• Know the rules. KDP does not allow reviews, quotes or testimonials, links, prices, time-limited offers, spoilers, emojis or keyword lists in the description.

What is a blurb for a book?

A blurb is the short piece of selling copy that describes a book to a potential reader. In print it is usually the back cover copy, which is why people often search for “what is the back of the book summary called”. On a hardback it may sit on the inside flap as the jacket copy. On Amazon and other online stores, the same text becomes the book description on the product page.

The word “blurb” causes some confusion because, in traditional publishing, it can also mean a short endorsement from another author (“Gripping from the first page”). This guide uses it in the sense most readers and indie authors mean: the description of the story. That distinction matters on Amazon, because endorsements are not allowed in the KDP description field (more on that below).

Blurb vs synopsis vs logline

These three are often mixed up, and each has a different reader.

Piece	Who reads it	Typical length	Reveals the ending?	Purpose
Logline or tagline	Readers, ads, social posts	One sentence	No	Hook attention instantly
Blurb (book description)	Readers on the cover or store page	Roughly 100-200 words	Never	Make the reader want to buy or borrow
Synopsis	Literary agents and editors	Often one to two pages	Yes, always	Show the whole plot works

If you are querying agents as well as self-publishing, you will need both. The guide to getting a literary agent covers the synopsis and query letter side.

The four-part blurb formula

Most strong fiction blurbs, whatever the genre, follow the same shape. Many authors learned versions of it from Bryan Cohen’s book How to Write a Sizzling Synopsis, which teaches a hook, a synopsis section and a selling paragraph. The version below is adapted for store pages, where the first two lines are often all a shopper sees before the “Read more” cut.

1. The hook (one or two lines). A bold, specific line that creates a question. It often combines character, situation and a contradiction: “She swore she’d never go back to Hollow Creek. Then her ex-husband turned up dead on her porch.”
2. The set-up (two to four sentences). Who the main character is, where they are and what they want. Use their name, one defining trait and the inciting incident. Skip backstory.
3. The stakes and complication (two to four sentences). What stands in the way, and what they lose if they fail. This is where conflict lives. In romance, it is why these two people cannot simply be together.
4. The close (one or two lines). A question, a tagline or a short “perfect for readers who love…” line that confirms the genre and promise.

Write in present tense and third person, keep paragraphs short, and cut every adjective that does not change the reader’s picture.

How to write a book blurb: step by step

1. List your book’s promise in five words. For example: “enemies to lovers, small town” or “missing child, unreliable husband”. This is your genre signal.
2. Read ten current bestseller blurbs in your exact subgenre. Note patterns only: opening style, length, use of bold, how heat level or content is signalled. Do not copy wording.
3. Write the hook three different ways. One leading with character, one with situation, one with a question. Choose the one that would make you stop scrolling.
4. Draft the set-up and stakes using only your main character (and love interest or antagonist). Leave out subplots and secondary characters.
5. Add the close. A tagline or question, plus any series or standalone note.
6. Cut by a third. First drafts are nearly always too long. Delete backstory, world-building names and vague words such as “journey”, “secrets” and “everything changes”.
7. Read it aloud, then ask someone who has not read the book what they think the story is about and who it is for. If they cannot say, revise.
8. Format and paste it into KDP using the editor’s bold and line breaks (see the formatting section below), then preview the live page on desktop and mobile.

Book blurb examples by genre

The examples below are written for this guide and describe imaginary books. They show how the same four parts flex to match what readers in each genre look for.

Romance

Romance readers want to know the trope, the setting, the heat level and that a happy ending is guaranteed, without the blurb saying so outright. Both leads usually appear, and the conflict is the reason they should not fall for each other. The live guide to romance tropes lists the signals readers search for.

Example: “The last thing Nell Archer needs is a fake fiancé. The last thing hockey captain Jonah Reyes needs is a scandal. One viral photo later, they have both. Two weeks. One family wedding. Absolutely no real feelings. So why does pretending feel so easy? A slow-burn, fake-dating romance with a grumpy hero and a guaranteed happy ending.”

Thriller and suspense

Lead with danger and a ticking clock. Short sentences raise pace. The question at the end should be about survival or the truth.

Example: “Seven days ago, Dr Mara Quinn’s patient walked out of hospital and vanished. Now the police say he never existed. No records. No photos. Only Mara remembers him, and someone wants her to stop. If she is right, a killer is hiding in plain sight. If she is wrong, she is losing her mind.”

Fantasy and science fiction

Readers love world-building, but the blurb is not the place for it. Use no more than one or two invented names, and anchor everything in a character’s choice.

Example: “Every hundred years, the tide city of Caldra chooses a drowned queen. This year it chose a thief. Ilsa has six nights to learn magic she was never meant to touch, or the sea will take the city and everyone she loves.”

Cosy mystery

Signal comfort as clearly as crime: a small community, a hobby or business, a likeable sleuth, no graphic violence.

Example: “Bakery owner Pip Hart has three problems: a broken oven, a judging panel arriving on Saturday and a body in her walk-in freezer. With the village convinced she did it, Pip and her nosy terrier must find the real culprit before the cake contest, and her reputation, go up in smoke.”

Non-fiction

Non-fiction blurbs swap the story for the reader’s problem. Open with the pain point, say what the book shows, list three to five concrete outcomes in bullet points, and close with who it is for. Avoid promises you cannot keep, especially about money or health.

Before and after: a blurb rewrite

Before (162 words, abridged here): “In a world where nothing is as it seems, Sarah Mills is about to go on a journey that will change everything. Growing up in a small town with her mother and three brothers, Sarah always dreamed of more. After college she moved to the city and worked hard as an architect, but something was missing. When she inherits her grandmother’s house on the coast, secrets begin to unravel…”

What is wrong: the opening is a cliché, the genre is unclear, backstory fills half the space, and “secrets” and “journey” say nothing specific.

After (78 words): “Architect Sarah Mills knows how to fix a broken building. A broken family is harder. When her estranged grandmother leaves her a crumbling cliff-top house, Sarah plans to sell it in a week. Then she finds letters hidden in the walls, all addressed to her, all dated after her grandmother supposedly cut her off. Some houses keep secrets. This one is waiting for Sarah to come home. A warm, emotional story of family, forgiveness and second chances.”

The rewrite names a specific problem, adds a mystery hook (the letters), signals women’s fiction with the closing line and is half the length.

How long is a blurb?

For most novels, aim for about 100-200 words. KDP’s help page on writing a description suggests around 150 words. Back cover copy on a paperback also has to share space with the barcode, so shorter often fits better. Non-fiction can run a little longer if it includes a bullet list of what the reader will learn.

The technical maximum on KDP is 4,000 characters, and the counter includes HTML tags. KDP’s own example: the word “test” is four characters, but in bold it becomes eleven because the bold tags count too. Heavy formatting can eat into your limit quickly.

Formatting your blurb on Amazon KDP

You add the description in the book details step for each format. The editor lets you apply bold, italics and lists, or switch to source view and type the HTML yourself. According to KDP’s help pages at the time of writing (October 2026), the description supports:

• line breaks (br; use two for an empty line) and paragraphs (p)
• bold (b), italics (i or em) and underline (u)
• headings from h4 to h6 only (larger headings are not supported)
• numbered and bulleted lists (ol and ul with li items)

Every tag needs its closing tag, and stray angle brackets can cause an “invisible characters” error. That error often appears after pasting from a word processor, so KDP suggests retyping the text or checking the HTML in source view.

What KDP does not allow in a description

This is the part many blurb guides get wrong. KDP’s description guidelines exclude:

• reviews, quotes, testimonials or requests for reviews
• phone numbers, addresses, email addresses or website links
• advertising, price, availability or time-sensitive information such as “on sale this week”
• spoilers, unicode emojis, and keywords or lists of search tags

Review quotes from publications belong in the Editorial Reviews section, which you manage through Amazon Author Central. Search terms belong in your seven keyword slots; the guide to KDP keywords and categories explains how they work. Keyword-stuffing a blurb reads badly to humans and breaks the rules.

A+ Content: the space below your blurb

KDP authors can also create A+ Content, image-based modules that appear further down the product page, from the Marketing section of their KDP account. It is useful for showing series order, character art, a map or interior pages, and it keeps the description itself short and focused.

Blurb checklist

• The first two lines would make sense on their own, before any “Read more” cut.
• Genre, subgenre and tone are obvious within 30 words.
• The main character is named and wants something specific.
• The obstacle and the stakes are clear.
• No more than two invented names, and no subplots.
• No spoilers, reviews, prices, links or keyword lists.
• Present tense, third person, short paragraphs.
• Roughly 100-200 words; under 4,000 characters with tags.
• It matches the promise of your cover; see book covers by genre.
• Previewed on desktop and mobile after publishing.

Common mistakes

• Summarising the plot. A blurb covers roughly the first quarter of the book, the inciting incident and the central question, not the whole story.
• Opening with the world, not the person. “In a land torn by war…” delays the reason to care.
• Too many names. Each new character, place or magic system is a speed bump.
• Vague stakes. “Everything she loves” is weaker than “her daughter’s custody hearing”.
• Genre confusion. A romance blurb that reads like a thriller attracts the wrong readers, who may then leave unhappy reviews.
• Pasting review quotes or a link into the description, which KDP’s guidelines do not allow.
• Never testing it. If you run ads or a launch, the blurb is one of the few things you can change easily. The guide to launching a self-published book shows where it fits in your launch plan.

Sources this guide draws on: KDP Help pages on writing a book description and fixing description formatting (checked October 2026); Bryan Cohen, How to Write a Sizzling Synopsis; general publishing guidance on back cover copy from Writers & Artists and Reedsy; patterns observed in bestselling genre book descriptions (no wording copied).

Frequently asked questions

What is the back of the book summary called?

It is usually called the blurb, back cover copy or, on a hardback with a dust jacket, jacket or flap copy. Online, the same text is called the book description. All of them have the same job: to sell the book without spoiling it.

How long should a book blurb be?

Most fiction blurbs work best at about 100-200 words, and KDP’s own help page suggests around 150. The KDP field allows up to 4,000 characters, including any HTML tags, but long descriptions rarely sell better because most shoppers skim.

Should a blurb be written in first or third person?

Third person present tense is the most common choice, even for books written in first person, because it reads clearly to someone who has not met the character. Some romance and young adult authors use a short first-person excerpt as a hook, then switch to third person for the rest.

Can I put reviews in my Amazon book description?

No. KDP’s description guidelines do not allow reviews, quotes, testimonials or requests for reviews. Editorial reviews can be added through Amazon Author Central, which shows them in a separate section of the product page.

What is the difference between a blurb and a synopsis?

A blurb is for readers and keeps the ending secret. A synopsis is for agents and editors and summarises the whole plot, including the ending, so they can judge whether the story works.

Can I change my blurb after publishing?

Yes. You can edit the description in your KDP book details at any time, and changes usually appear after a review period. Many authors refresh the blurb when sales slow or when a new book in the series comes out.

A good blurb is short, specific and honest about what kind of book it is. Write it early, rewrite it ruthlessly, and treat it as part of your book rather than an afterthought.