How Do I Write a Blurb for a Novel?

A fiction blurb has one job: make a reader who likes your genre want to open the book. Give it a hook, a main character, what that character stands to lose and what is in the way, and stop before the ending. Keep it inside KDP’s 4,000 character limit and its rules. Here is how I build one.

What goes in a fiction blurb?

Four things, in this order.

The hook. One line that makes the reader curious. It can be a question, a situation or a promise of the kind of book this is.

The character. Who is this about? Give a name and one fact that matters to the story.

The stakes. What does the character want, and what happens if they fail?

What is in the way. The enemy, the secret, the clock or the choice that makes the story hard.

Then add the genre signals. A reader of romance, thrillers or fantasy scans for the tropes they love, so use the words that genre uses in the blurb itself (enemies to lovers, locked room, found family). Use them only if the book really has them.

What does that look like in practice?

Here is an invented example. The book and the blurb are made up to show the parts.

A lighthouse keeper’s last winter. (hook)

Mara Quill has kept the Skerry light alone for eleven years. (character) When the relief boat does not come, she has until the supplies run out to find who has been signalling the cliffs at night. (stakes) Every clue points to the only other person on the island, and he is the man she has been writing to for a year. (what is in the way)

It has no ending, no review quote and no link. Read it again and notice that each sentence adds one new thing.

How long should the blurb be?

Short. KDP’s description rules say the limit is 4,000 characters, and the count includes any HTML tags. That is a ceiling, not a target. Put the hook in the first line, because that is what shows before a reader decides to read on.

What do KDP’s rules allow in a description?

KDP’s description page lists the formatting it supports: line breaks, paragraphs, bold, emphasis, italics, underline, numbered and bulleted lists, and h4 to h6 headings. The h1, h2 and h3 headings are not supported. Use bold for the hook and short paragraphs so the blurb is easy to scan on a phone.

KDP’s metadata guidelines list what it cannot accept in a description: reviews, quotes or testimonials, requests for customer reviews, phone numbers, addresses, email addresses and website URLs, advertisements or promotional material, time-sensitive information, price or ordering information, spoilers and any keywords or book tag phrases. Keywords have their own boxes, and I cover them in how to use keywords on Amazon KDP. Reviewers’ praise and “on sale now” lines do not belong in the blurb.

What mistakes make a novel blurb fall flat?

Weak blurbs usually make one of these mistakes:

• They retell the plot. A blurb is a promise about the first act, not a summary of the book. Stop at the problem.
• They name too many people. One main character, maybe two. A reader who has not opened the book cannot keep five names straight.
• They start with backstory. History, world-building and the prologue can wait. Open with the person and the trouble.
• They hide the genre. If the blurb could belong to a thriller or a romance, the reader of either will scroll past.
• They break KDP’s rules. Review quotes, links and “on sale this week” lines are not accepted, as the section above shows.

Can I change the blurb after I publish?

Yes. KDP’s description page gives the steps to add or update it: open your Bookshelf, choose Edit Details, change the Description field, click Save and Continue, then click Publish on the Pricing page. That means you can test a new opening line without republishing the book, so write the best version you can now and keep improving it.

How do I test my blurb?

Pick the five best sellers in your genre and read only their blurbs. Look at how the first line is built, how long they run and which tropes they name. Check the category you picked too, with my post on the best book categories on Amazon. Then put yours next to them. If a stranger could not tell which genre yours belongs to after the first two lines, rewrite the opening.

Then read it aloud to someone who has not read the book and ask what they think happens. If they are wrong, the blurb is not yet showing what the book is.

For a non-fiction book the formula is different, and I cover it in non-fiction book descriptions that sell books. If you would like a second pair of eyes on your blurb, book a free 25-minute discovery call. Which part of your blurb is stuck?

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