What Is a Blurb? Examples and How to Write One

Dictionaries agree on the core meaning. Cambridge Dictionary defines a blurb as a short description of a book or film, written by the people who produced it to make others want to buy or see it. Oxford Learner’s Dictionaries gives the same sense and says the American humorist Gelett Burgess coined the word early in the 20th century.

American English adds a second meaning. In its American entry, Dictionary.com describes a blurb as a brief advertisement or announcement, especially one full of praise, with the example of someone writing a blurb for a friend’s novel: the endorsement another author gives you for a cover. Its British entry, from Collins, sticks to the promotional description on a book jacket.

This guide is about the first meaning. The second matters on Amazon, where KDP treats the two differently.

All five describe a book in fewer words than the book. What separates them is who reads them and what they are for.

The pair people confuse most is blurb vs synopsis. Writer’s Digest describes a synopsis as a long summary of a novel, written to win over a literary agent, that tells the story from beginning to end. The same article notes that a pitch, like the back of a book, keeps the ending to itself. A blurb is that pitch.

KDP blurs the line by asking, in its metadata guidelines, for a summary of the story and characters, then telling you to give away nothing that adds to the suspense or surprise. That is a blurb by another name.

KDP’s metadata guidelines suggest treating the description as a 30-second elevator pitch to a casual browser and studying the back covers and jacket flaps of books in your genre. Start there, with books near the top of your category: note their length, tone and what they leave out.

For fiction, build the blurb from five parts:

1. A hook. One line that makes the reader want the next: a strange event, a hard choice, a voice. KDP’s description guide notes that the first sentence may be a reader’s first impression.
2. A character who wants something. Who the story follows and what they are after.
3. The obstacle. A rival, a secret, a deadline, a rule of the world.
4. The stakes. What this character loses if they fail. Make them specific.
5. An open question. End on the choice or danger the book resolves, never on how it resolves.

The same KDP guide advises showing the genre, so a romance blurb should sound like romance from its first line, and a thriller like a thriller.

Nonfiction swaps the character for the reader:

• The problem, in the reader’s own words.
• The promise: what changes after reading.
• What is inside: a short list of methods, tools or chapters.
• Who it is for, and perhaps who it is not for.
• Why you, in one line, with claims you can back up.

Write a long version first, cut it down to these parts, then read it aloud. Any sentence you stumble over is too long for a blurb.

These five blurbs were written for this article, for books that do not exist. The note under each says which part does the work.

Thriller

Three days after the funeral, Nora Vance gets a text from her dead brother’s phone: Don’t go to the police.

Nora investigates insurance fraud for a living, and she never thought Daniel had anything to hide. But the messages keep coming, each pointing to a warehouse fire he swore was an accident.

Someone wants Nora to finish what Daniel started. Someone else burned down a building to keep it buried.

One impossible event, one character with a useful skill, a mystery and two opposing threats. Nothing says who sent the texts.

Romance

Mara swore she would never go back to Larkfield. Then her grandmother left her the bakery, its debts and a recipe book in a code only one other person can read: Wes Calder, who stood her up at prom and now runs the hardware store across the street.

To save the bakery, Mara needs Wes. To save her pride, she needs to remember why she left.

A small-town second-chance romance with a happy ending.

Two names, a reason they must work together and a reason they should not. The last line names the subgenre and the ending romance readers expect, without giving away the plot.

Fantasy

In the river city of Varrow, every contract is enforced by the water. Sera Quill forges those contracts for people who cannot pay.

Then her handwriting turns up on a contract found with the drowned high priest, and the city’s oldest law demands a culprit before the next flood. Sera must find the real forger by then, or become the river’s next payment.

The world gets one sentence: the rule the plot depends on. Everything after it is character, problem and deadline.

Nonfiction

You open your budget spreadsheet on the first of the month and close it by the fifth.

This book is for people who have tried apps and envelopes and still don’t know where their money goes. It swaps tracking every coffee for a short weekly check-in.

Inside:

• how to set a spending limit you will keep
• what to do in the month something goes wrong
• how to share the plan with a partner

A habit the reader recognizes, who the book is for, a promise and what is inside. A list like this is where KDP’s HTML bullets earn their place.

Puzzle and activity books

Big, clear letters on bright white pages, one puzzle to a page and every answer at the back. These word searches follow themes from gardens and travel to family kitchens, with words chosen to be easy to read and satisfying to find.

A relaxing gift for grandparents, or for anyone who would rather leave their reading glasses in the drawer.

Here the format is the selling point, so the blurb leads with it: print size, layout, answers, themes and who it suits.

An Amazon page and a printed cover have different limits.

On Amazon, the KDP description field holds up to 4,000 characters, and KDP’s advice is to aim for a 150-word paragraph with sentences that are easy to scan (Write a Book Description). Treat 4,000 as a ceiling, not a target: a novel that sells in 150 words gains little from 400 more. Nonfiction can use more room for a list.

On a printed back cover, the space decides. If you do not supply a barcode, KDP places one on the back cover, and covers with text or images in the barcode location are rejected (Barcodes). Cover text should sit at least 0.125 inch (3.2 mm) inside the trim lines, in type of at least 7 points (Create a Paperback Cover). In KDP’s Cover Creator, the back cover has two text boxes, for the description and an author bio, and the text has to fit its box (Cover Creator).

So the back cover usually gets a tighter version. All five examples above stay under 90 words; to check yours, print the cover at actual size and read it at arm’s length.

The description is one of the book details you fill in when you set up a title in KDP; our guide to self-publishing a book on Amazon covers the other fields. KDP accepts formatting from its text editor or basic HTML, and its Write a Book Description page lists the supported tags:

Three details catch people out:

• Tags count toward the limit. KDP counts every character, HTML included: the word test is 4 characters, and 11 once it is bold.
• The Source button shows the code. Click it at the top of the Description field to see the HTML and check the count.
• Extra spaces vanish. Double spaces do not show on the detail page, so lay the text out with line breaks.

The same KDP page lists what it does not accept in a description at all: phone numbers, addresses, email addresses and links; reviews, quotes or testimonials; requests for reviews; advertising or promotional material; time-sensitive details such as tour dates; availability, price or other ordering information; spoilers; Unicode emojis; and keyword or tag phrases.

Here the two meanings of blurb part ways. An endorsement from another author is a quote, so it cannot go in the description. KDP’s Author Central page lists Editorial Reviews as a feature, in the US only: that is the place for praise.

KDP’s content guidelines, which cover the product description, add two rules. The description must not mislead customers or misrepresent the book. And text written by an AI tool counts as AI-generated even after substantial edits, which you must disclose; a blurb you wrote and only polished with AI needs no disclosure. More in our guide to book metadata with AI.

You can update the description after publishing, for ebooks and print alike (Update your book details), and KDP’s timelines list 72 hours for an ebook’s new description to appear. To skip writing HTML by hand, the free book description generator turns your hook, promise, bullet points and audience into HTML that KDP accepts and counts the characters, tags included.

• Retelling the plot. If the blurb covers the second half of the book, it has become a synopsis. Stop once the main conflict is clear.
• Starting with backstory. Open with the character and the problem; history and world-building can wait for chapter one.
• Too many names. Each one is something to remember. Two or three are plenty.
• Adjectives instead of events. “Gripping” and “unforgettable” fit any book. Show the event that makes yours gripping.
• A blurb that fights the title. Title, cover and blurb should promise the same book. If the title is still open, the free title analyzer checks its length, readability and keyword use.
• Promises the book does not keep. Overselling brings in readers who will be disappointed, and KDP does not allow descriptions that misrepresent the book.

Once a book runs Amazon Ads, a weak blurb costs money. Sponsored Products ads send shoppers who click to the book’s detail page, and KDP’s advertising help says a strong detail page with a good summary helps turn clicks into sales. A shopper who clicks, reads and leaves is a click you paid for.

Because the description stays editable, test it. Rewrite it, give the change time to go live (72 hours for an ebook, by KDP’s timelines), then compare a few weeks before and after for that book: clicks, orders and sales, with bids and targeting left alone. More orders from the same clicks means a lower ACOS for the same spend. Our guide to Sponsored Products for books shows how to read those results against your royalty.

In SelfPub Go, the Before → after tab in Reports compares two periods book by book: spend, sales, orders and ACOS. The Texts for Amazon step of a book project checks a description against KDP’s rules: length with tags, unsupported tags, links, prices, reviews and emoji.

KDP rules here come from KDP Help as of the date at the top of the page. If a linked page now says otherwise, trust the linked page.