How to write a book blurb that sells (with before and after examples)

This is the same framework behind more than 7,000 fiction sales from the authors I've worked with. One of my students put it like this after the rewrite: "I went from absolute zero sales to two or three sales a day. It was night and day."

Of everything on your Amazon page, the blurb is the biggest lever you have, and the easiest to pull. Below you'll find the framework, three before and after book blurb examples, and a template you can copy.

A blurb isn't a summary

Most authors write blurbs that hurt their sales. Not because they're bad writers, but because they're writing summaries, not sales copy.

You wrote a hundred thousand words to tell the story. The blurb has a few seconds to pull someone in. Readers buy with emotion and justify with logic. Your blurb has to hand them the emotion first.

I think of it like the window at a bakery. The croissants might look good in the window, but it's the smell that stops people on the sidewalk. So ask yourself: is your blurb the scent of a warm bakery, or the whiff of a sewage plant with Febreze on it?

These are the mistakes I see most often:

• A vague summary instead of persuasive copy. "This happens, then this happens, then he goes here." The editor on my team flags this more than anything: "I'm not getting how he's feeling and how it's affecting him."
• Too long, too short, or confusing.
• Hooking nobody in particular. If it could describe a hundred books, it won't sell yours.
• Selling "a book" instead of a feeling. Readers aren't buying pages. They're buying an experience.

The Written Word Media reader survey backs this up: the book description, the author and the cover are the top factors when readers decide what to buy. The cover gets the click. The blurb makes the sale.

Start with the feeling you're selling

Before you write a word, answer two questions:

1. Who is this for? Be specific about your genre. Write "grimdark" or "cozy fantasy," not just "fantasy."
2. How do I want the reader to feel at the end of this book?

Love, fear, desire, anger, grief, hope, guilt, jealousy. These aren't just feelings. They're what drives people to buy.

Your genre already tells you a lot about the feeling readers are shopping for:

Pick two or three emotional themes that reflect the heart of your story, not just the plot. Inside the course I use a Theme Selector with more than 60 options, from "that slow-burn ache that finally ignites" to "knowing the peace won't last and turning the page anyway."

The 4-layer blurb framework

I call it the four-layer blurb cake. Each layer does one job, and they stack in this order.

Layer 1: Credibility

A short review quote, award or editorial line goes at the very top, even before the hook. From all our testing, that's where it performs best. Readers instinctively ask "Is this book any good?" before anything else, and this answers it.

The best credibility lines do two things: they praise the book, and they set expectations. "The best epic fantasy I've read all year" beats "A great read!"

Don't have one yet? Skip this layer for now and add it once your first reviews come in. Readers' Favorite (affiliate link) is my favorite source for editorial reviews. And don't overdo it. I've seen blurbs with so many review quotes that the actual story was only 98 words long.

One honest note: KDP's description rules technically don't allow review quotes. Many authors use them anyway. If Amazon flags yours, move the quote to the Editorial Reviews section and lead with an award or a "bestselling author" line instead.

Layer 2: The hook

This is one bold line, ideally 12 to 24 words, that stops the scroll and puts the reader straight into your genre's mood.

Four types of hook that work:

• A shocking fact: Tonight, she is scheduled to die.
• A raw emotion: She's already buried one husband. She won't survive burying another.
• A sharp contrast: They expected a joyful adventure. They got the slave pits of Ancient Rome.
• A quotable line: something that could sit on the cover.

Put it in bold, as its own short paragraph.

Layer 3: The body

This is two or three short paragraphs of one to four lines each. Introduce your main character, the core conflict and the stakes, without spoilers.

Here's the skeleton:

Each paragraph should raise the tension above the one before it. If you could delete a paragraph without losing any stakes, cut it.

This is where the editor on my team earns her nickname: the blurb queen. Her rules, from our Office Hours sessions:

• Cut every word that doesn't earn its place. "We add extra words when we talk as a buffer. But when we read, we want to keep it tight. You only have your reader for so many seconds."
• Use strong verbs. Words like "starts" and "wants" are soft. "Determined" hits harder than "wants."
• Don't over-explain. "They will learn more when they're reading."
• Take your own voice out of it. Conversational filler slows the pace and puts buffers between the moments of action.
• Don't use a $10 word when a $1 word will do. You want readers from outside your usual crowd to get it too.
• Hint at the emotional experience, don't walk through the plot.

A few more of my own: name only your main character, and call everyone else by their role (the queen, her brother, the heretic). Skip invented words and in-world terms. "The Kethrani Accord" means nothing to someone who hasn't read your book.

Layer 4: The close

This is one or two lines in italics, set apart from the body. It wraps up the emotional promise with a cliffhanger, a question the reader needs answered, or your tropes and comp authors.

It should match the tone of the hook, like two slices of bread on the same sandwich. A pulse-pounding ride through betrayal, survival and the cost of hope.

The blurb queen's tip: put the character's priorities in order. If your hero cares more about his found family than the world, ask "Can he save his found family, and maybe even the world?" Family first.

Book blurb examples: before and after

The three books below are made up, so I can show you the full rewrite without sharing anyone's blurb. The mistakes are real, though. I see them in client blurbs every week. Flip each one from before to after.

A fill-in-the-blank blurb template

Copy this into your document and fill in the brackets.

[CREDIBILITY] ★★★★★ "[Short review quote that praises the book and names the genre]" [Source]

[HOOK, in bold, 12 to 24 words]
[A shocking fact, raw emotion, sharp contrast, or quotable line]

[BODY, 2 to 3 short paragraphs]
[Protagonist] has [their life before everything changes].
When [inciting incident], [what shatters].
Now [they must do what], but [obstacle / who stands in the way].
If they fail, [what they lose].

[CLOSE, in italics, 1 to 2 lines]
For fans of [comp author] and [comp author]. [Emotional promise or question.]

Then check it:

• 150 to 170 words in total
• Only the main character is named
• No invented words or in-world terms
• Every paragraph raises the tension
• At least one line in each paragraph lands on emotion, not plot
• The close matches the tone of the hook

How long should a book blurb be?

150 to 170 words. That's what months of testing across my clients' books has shown works best.

Under 150 usually means the blurb is unfinished: the stakes are missing, or there's no close. Much over 170 and you're summarizing again. KDP lets you use up to 4,000 characters, but more room doesn't mean you should fill it.

The top of the blurb matters most. On Amazon, only the first few lines show before the "Read more" link, especially on a phone. Your credibility line and your hook have to do their work above that line, because plenty of shoppers never click it.

Formatting your blurb on Amazon

On Amazon, your blurb is your book description. Format it like this:

• Credibility line at the top.
• Hook in bold, as its own paragraph.
• Body in short paragraphs, one to four lines each. Vary the lengths so it breathes.
• Close in italics, separated from the body. The change in style tells the reader it's time to decide.

You paste it into the Book Description box on your book's details page in KDP, which has a simple editor for bold and italics. It takes a couple of minutes to update, and your new blurb is usually live within a day or so.

So test it. Changing your blurb is free.

The back cover blurb vs the Amazon description

They can use the same copy. Many of my clients put the new Amazon blurb straight onto the paperback.

But the Amazon version matters far more. About 98% of fiction sales from the authors I work with are ebooks. On Amazon, you can change the blurb in minutes, for free, as many times as you like. A back cover means a new file, a new proof and a wait.

So get the Amazon description right first and prove it works. The back cover can catch up later.

How to tell if your blurb is the problem

Most blurb guides skip this, because it comes from ad data.

If your ads get clicks at a normal cost but few of those clicks turn into sales, the problem isn't your ads. It's your page. Your targeting did its job. People clicked. Something on the page talked them out of buying.

What "normal" looks like:

• Facebook ads: clicks around 15 to 30 cents, and 1.5% to 4% of clicks turning into sales.
• Amazon ads: about 5% of clicks turning into sales is good, and 10% is excellent.

If your clicks are fine and your sales are well below those numbers, check the cover and the blurb first. Pricing and the Look Inside can also be the cause, but they're much harder to diagnose. The blurb is the easiest thing to test, and the cheapest to fix.

A real example: one of my done-for-you sci-fi clients couldn't get his Facebook conversion above 0.6% for about a year and a half. We rewrote the blurb. Conversion more than doubled, to 1.26%, and his cost per new reader dropped from $17.59 to $5.92, right inside the healthy $2 to $10 range.

Ad data can also tell you which blurb to write. For one client, Amazon ads showed that readers searching for post-apocalyptic science fiction bought, while the young adult and first contact angles didn't convert at all. So we rewrote the blurb to promise the book those readers wanted.

More on reading those numbers in my Facebook ads playbook and in cost per new reader vs value per new reader. And if you're still setting up the rest of your page, start with how to market a self-published book.

Using AI to write your blurb

A blurb is copywriting, not storytelling. That's why AI helps. You could spend a week on a blurb, or you could have a solid draft in 20 minutes.

I've used ChatGPT for years and I use Claude a lot now. The model matters less than the framework and the prompt. A few things make the difference:

• Give it a lot to work with. Your current blurb, your genre and subgenre, two or three comp authors, your themes and your tones. A one- or two-page summary is even better.
• Tell it to interview you. Ask it to ask you questions, one at a time, before it writes anything.
• Tell it not to invent anything. AI will happily make up plot points, and a blurb that promises the wrong book leads to bad reviews.
• Ask for two versions with different hooks, and pick one.

If the draft could describe a hundred books, your prompt was too thin.

It's a tool, not a replacement. You still make the final call. One tip: paste the finished draft into a fresh chat and ask what it thinks. Sometimes it'll tell you the blurb it just wrote is awful.

Frequently asked questions