How to Write a Book Blurb: Step-by-Step Formula and Examples

A book blurb is a short piece of sales copy, usually around 100 to 200 words, that tells a browsing reader what your book is and why they should read it. For fiction, introduce a character, the problem they face and what they stand to lose, without giving away the ending. A non-fiction blurb should name the reader's problem, promise a result and show why your book can deliver it.

The steps below take you from a blank page to a finished blurb you can print on a back cover or adapt for a store page.

What you need before you start writing a blurb

Gather these first. Each one saves you a rewrite later.

• A finished or near-finished manuscript. You can draft a blurb early, but you need to know the real conflict and the real payoff to describe them honestly.
• Your genre and subgenre. "Fantasy" is too broad. "Cosy fantasy with a found-family cast" tells you what tone the blurb needs.
• Your target reader. Picture one person who would love this book. What do they already read?
• Three to five books like yours. Read their back covers and store descriptions. Note how long they are, what tense they use and how they open. Don't copy them. Just learn the conventions readers in your genre expect.
• A one-sentence summary. If you built a premise or a book bible while writing, start from that. If you didn't, write one now: who, wants what, but what stands in the way.
• Your point of view. Most fiction blurbs are written in third person, present tense, even if the book is in first person. Know your book's point of view so you can decide whether to match it or not.

Step 1: Decide who the blurb is for and where it will appear

A blurb has one job: to get the right reader to open the book or click "buy". It doesn't need to summarise the plot or the table of contents.

Decide where it will live:

• Back cover of a print book. Space is fixed by your trim size, and the barcode takes a corner. Shorter is safer. Use the book cover size calculator to see how much room your back cover has.
• Store page (Amazon, Apple Books, Kobo and others). You usually get more room and can add formatting or a short line of praise. The store version is often your back-cover blurb plus a little extra. For the Amazon version specifically, see how to write a book description for Amazon.
• Your own website or retailer listings. Same core copy, adapted for length.

Write the back-cover version first. It's the tightest, and it's easier to expand a good short blurb than to cut a bloated long one.

Step 2: Write a hook line

The hook is the first sentence, often set in bold or a larger font. Its job is to make someone read sentence two.

Good hooks do one of these things:

• State an unusual situation. "Every night at midnight, the town of Harrow forgets one person."
• Pose a high-stakes choice. "To save her brother, she has to betray the only friend she has left."
• Name a reader's pain directly (non-fiction). "You're working more hours than ever, and your savings still aren't growing."
• Make a clear, believable promise (non-fiction). "You can plan a week of family dinners in twenty minutes."

Write ten hook lines. Most will be weak. Pick the one that would still make sense if it were the only line a stranger read.

Avoid hooks that could fit any book: "A story of love, loss and courage" says nothing about yours.

Step 3: Choose a blurb formula

Fiction and non-fiction need different structures. Pick the one that matches your book.

Part	Fiction blurb	Non-fiction blurb
Opening	Hook: an unusual situation or dilemma	Hook: the reader's problem or desire
Middle 1	Main character and their normal world	Why the problem persists or what most advice gets wrong
Middle 2	The inciting incident: what changes	What the book teaches, often as 3–5 short benefit points
Middle 3	The stakes: what they could lose	Who the author is and why they can help
Close	An open question or a moment of choice	The result the reader can expect, plus who the book is for
Tone	Matches the genre (tense, funny, dark, warm)	Clear, confident and specific
Typical length	Roughly 100–200 words	Roughly 100–200 words on the back cover, often longer online

Step 3a: The fiction formula

Write one short paragraph for each of these four beats.

1. Character. Name the main character and give one detail that makes them specific: a job, a flaw, a secret. "Juno Abara restores old radios in her grandfather's shop."
2. Change. What happens that breaks their normal life? "When a dead station starts broadcasting her name, she follows the signal to an abandoned airfield."
3. Stakes. What do they stand to lose? Make it personal, not just "the world". "The voice on the radio knows things only her missing mother knew."
4. Close. End on a question, a choice or a tension the reader wants resolved. "Some frequencies were shut off for a reason."

A romance blurb may introduce both leads, each with their own want. Thrillers should push the clock and the danger. In literary fiction, tone and voice matter as much as plot, so the blurb can be quieter but must still suggest a central tension.

If you need help pinning down the core conflict, revisit your outline. The guide on how to outline a novel covers how to name the main problem in one line.

Step 3b: The non-fiction formula

1. Problem. Speak to the reader's situation in their words. "Freelancers get paid unevenly, so a normal monthly budget falls apart by week two."
2. Gap. Explain why usual advice fails them. "Most budgeting books assume a steady salary."
3. Benefits. List what the book helps them do. Use specific verbs.
   • Build a budget around irregular income
   • Set aside tax money without spreadsheets
   • Know your real hourly rate
4. Credibility. One or two lines on why you're the right person. Use only true, checkable facts about yourself. Don't invent client numbers or results.
5. Result. Describe the outcome and who the book is for. "For freelancers who want calm, not cash-flow panic."

Memoir sits between the two. Lead with the story like fiction, then hint at what the reader will take away, like non-fiction. The guides on writing a non-fiction book and writing a memoir go deeper on positioning.

Step 4: Set the length of your book blurb

For a back cover, aim for roughly 100 to 200 words. That's a common convention, not a store rule, and it's limited by the physical space. A small trim size with a large font holds less. Lay your text on the actual cover template before you call it finished.

Store pages usually give you more room. Retailers set their own character limits for descriptions, and those limits can change, so check the current limit in each store's dashboard (for example, the description field in KDP). Longer doesn't mean better. Most readers decide within the first few lines, so the hook and first paragraph still do the heavy lifting.

A practical way to hit the length:

1. Write a messy first draft with no word limit.
2. Cut every sentence that explains backstory or worldbuilding the reader doesn't need yet.
3. Cut every adjective that isn't doing work ("very", "truly", "incredible").
4. Read it aloud. If you run out of breath in a sentence, split it.

Step 5: End the blurb

The final line should leave the reader wanting the book, not feeling they already know it.

Fiction endings that work:

• A question tied to the stakes: "Can she find her mother before the signal goes silent?" Use sparingly, as these can sound clichéd.
• A short, ominous statement: "The airfield isn't empty."
• A choice: "She can keep the shop, or she can learn the truth. Not both."

Non-fiction endings that work:

• A clear "this book is for" line.
• A short restatement of the promise: "Stop guessing. Start planning."

You can add a positioning line after the blurb, such as "Perfect for readers who love small-town mysteries with a supernatural twist." Keep it about tone and subgenre. Comparing your book to a specific bestseller can help readers find it, but don't overpromise or imply an endorsement you don't have.

Step 6: Test and polish the blurb

Do these checks before you publish:

• The stranger test. Give the blurb to someone who hasn't read the book. Ask them what genre it is, who the main character is and what the problem is. If they can't say, revise.
• The spoiler test. Does it reveal anything past roughly the first quarter of the book? If so, cut it.
• The genre test. Put your blurb next to the comparison books you gathered. Does it feel like it belongs on the same shelf?
• The name test. Count proper nouns. More than three or four names in a short blurb confuses readers.
• The read-aloud test. Clunky rhythm shows up instantly when spoken.

Then adapt it. The back-cover version is your base. For store pages, you might add a bolded hook, a line break between paragraphs and a positioning line. If you publish on several stores, the self-publishing guide explains where the description fits into each upload. If you write with Inkora, the publishing kit includes a draft description alongside keywords and BISAC categories, which you can use as a starting point and edit into your own voice.

Examples of finished blurbs

These are invented examples written for this article, not taken from real books.

Fiction: cosy fantasy (about 110 words)

In the village of Fennick, the bakery opens at dawn and the dragon wakes at dusk.

Pell Hartley inherited her aunt's bakery, a pile of debts and one strange instruction: feed the creature in the cellar every evening, and never let it go hungry.

Pell can manage the flour. She can't manage the dragon, who is grumpy, sarcastic and very, very old. When a rival baker starts asking questions about what's behind the cellar door, Pell has to decide who she can trust before the whole village finds out.

A warm, funny story about found family, second chances and really good bread.

Fiction: psychological thriller (about 95 words)

The house was supposed to be a fresh start. Then Nora found her own handwriting on the walls.

After the divorce, Nora Lisle buys a cheap farmhouse two hours from anyone she knows. The first note appears on the kitchen wall: Don't open the attic. It's in her writing. She doesn't remember writing it.

The notes keep coming. Each one knows something she's never told anyone.

Nora can leave and never learn the truth, or stay and find out who has been living in her house.

Non-fiction: practical guide (about 120 words)

You love your houseplants. They keep dying anyway.

Most plant guides list care instructions for hundreds of species. That's not the problem. The problem is that nobody explains why plants fail in real homes, with real windows and real schedules.

This short, practical book shows you how to:

• Read the light in any room in under a minute
• Water by checking the plant, not the calendar
• Spot the early signs of trouble before leaves drop
• Choose plants that suit how you actually live

Written by a former garden-centre manager who answered the same questions for years, it's for anyone who wants a home full of plants that survive.

Mistakes that stop a blurb from selling the book

• Plot summary instead of setup. Listing events in order reads like a book report. Show the situation and the stakes, then stop.
• Too many characters. One protagonist (two in romance) is usually enough.
• Vague emotion words. "Heart-wrenching" and "unforgettable" are claims, not evidence. Show a specific situation that creates the feeling.
• Worldbuilding dumps. Readers don't need the history of your magic system to pick up the book.
• Wrong tone for the genre. A comedic blurb on a grim thriller attracts the wrong readers and invites disappointed reviews.
• Spoilers. Never reveal the twist, the ending or the second-half turning point.
• Invented praise or claims. Don't add quotes, awards or sales figures you can't back up. For non-fiction, don't promise results you can't support.
• Talking about yourself in a fiction blurb. Author bios belong elsewhere. Save credentials for non-fiction.

Common problems and fixes

"My blurb is twice as long as it should be." Cut the backstory paragraph entirely, then read it again. Most blurbs survive without it. If it still runs long, merge the character and change beats into one paragraph.

"I can't figure out the stakes." Ask what the main character loses if they fail, in personal terms. Not "the kingdom falls" but "her sister is executed at dawn." If you truly can't answer, the issue may be in the manuscript, not the blurb.

"My non-fiction blurb sounds like a textbook." Rewrite the opening in the words a frustrated reader would use when talking to a friend. Swap abstract nouns ("financial optimisation") for concrete ones ("knowing what you can spend this week").

"It doesn't fit on the back cover." Check your trim size and spine with the cover tools, reduce the blurb to the hook plus two short paragraphs, and move extra lines (praise, positioning) to the store page.

"Readers say the book isn't what they expected." Your blurb is signalling the wrong genre or tone. Compare it again with books readers actually liked, adjust the hook and closing line, and update the description in your store dashboard. Most stores let you edit descriptions after publishing.

"I've rewritten it so many times I can't judge it anymore." Put it away for two days, then do the stranger test with someone new.

A strong blurb names a specific person or problem, raises a clear question and stops before it answers it. Draft many hooks, pick the formula that fits your book, cut hard, then test it on readers who haven't seen the manuscript. Once it works on the back cover, adapting it for each store is quick.