How to Market Your Book on Amazon

How Amazon's algorithm works

Amazon's recommendation engine, often called A9, decides which books show up in search results, which appear in "Customers also bought" carousels, and which surface in category bestseller lists. It is not random, and it is not purely pay-to-play.

The algorithm optimizes for one thing: sales. Books that convert browsers into buyers get rewarded with more visibility. More visibility leads to more sales. Sales lead to more visibility. This is the flywheel that every Amazon marketing strategy is trying to start.

The algorithm's inputs include your book's sales velocity, your listing's conversion rate (how often someone who views your page actually buys), your review count and rating, your sales rank within your categories, and whether paid ads are driving traffic to a listing that converts.

The good news is that most of the optimization levers are free. You do not need an advertising budget to dramatically improve how your listing performs. You need to understand what readers look for when they land on a book page and give them more of it.

Writing your book description

Your description is not a synopsis. A synopsis tells what happens. A description sells the experience of reading the book. These are different tasks, and most authors default to the synopsis because they know how to write one.

The structure that converts

The most effective book descriptions follow a predictable structure:

1. Hook line (first one to two sentences). These appear before Amazon's "read more" fold. If this line does not create curiosity or emotional investment, most readers will not click through to read the rest. It needs to be your most compelling sentence.
2. Setup and stakes. Who is the protagonist, what do they want, and what stands in their way? For nonfiction: what problem does the reader have, and why does this book solve it better than anything else available?
3. The promise. What is the reader's experience going to be? The feeling. The payoff. The transformation. This is especially important for genre fiction.
4. Comparators and social proof (optional but effective). "Fans of X and Y will love this book" helps readers self-sort. Critical praise lines work here too, but only if they are specific and from credible sources.
5. Call to action. A short, direct invitation: "Pick up your copy today" or "Start reading" or "Download it now." It sounds obvious, but it measurably lifts click-to-buy rates.

HTML formatting in your description

Amazon supports a limited set of HTML tags in book descriptions: bold, italic, paragraph breaks, and line breaks. Use them. A wall of text reads as unprofessional and converts poorly. Bold your hook line. Use paragraph breaks to create visual breathing room. Format your call to action as its own line.

Categories and keywords

Category selection is one of the most underused levers in Amazon marketing, and one of the most misunderstood.

How categories work

Amazon allows you to select two visible categories for your book. Your book can appear in bestseller lists within those categories, and category bestseller status is a real sales driver because it signals social proof to browsers who have not heard of you.

The strategic choice is specificity. Many authors default to the broadest category in their genre: Fiction / Thriller, Fiction / Romance. These categories have thousands of books competing for a top-100 spot. A more specific subcategory, say Fiction / Thrillers / Legal or Fiction / Romance / Romantic Suspense, has far fewer competitors. Ranking in a specific subcategory is achievable and drives real visibility.

You can request to be added to up to ten additional categories by contacting KDP support directly. Most authors do not know this. Use it.

Backend keywords

Amazon gives you seven keyword fields (each allowing up to 50 characters) in your book's backend metadata. These are not visible to readers, but they are fully searchable by Amazon's algorithm. Use all of them.

Effective backend keywords are not just genre labels. They are phrases that describe the experience of reading the book, the kinds of comparators readers use, the settings, the tropes, and the emotional notes. For a cozy mystery set in a bakery: "cozy mystery with recipes," "amateur sleuth," "small town mystery," "British cozy style," "culinary mystery fiction." Think like a reader describing the book to a friend, not like a librarian cataloguing it.

A+ Content

A+ Content is the branded, image-rich section that appears below the description on Amazon book pages. It is available to KDP authors who have published a book and to traditionally published titles through Author Central. It is free, it is underused, and it meaningfully improves conversion rates on listings that use it well.

What to include in your A+ Content

• A large cover image in context (the book on a desk, in a hand, as part of a lifestyle image that fits your genre)
• A short, tight author bio with a professional photo
• Series information if applicable, with covers of other books in the series
• Comparative title callouts if you have strong comps
• Two or three reader reviews quoted as pull quotes, using specific and compelling language, not just "this book was amazing"

A+ Content is not the place for a long essay about your creative process. Every element should serve one purpose: giving a reader who is already on the fence a reason to click Buy.

Building your reviews

Review count is one of the strongest signals in Amazon's algorithm. Books with more reviews rank higher, convert better, and trigger more "customers also bought" placements. The single most impactful thing you can do for your Amazon marketing is get more reviews, consistently.

How to get more reviews ethically

Advance review copies (ARCs). Send your book to readers before it launches in exchange for honest reviews at launch. NetGalley, Edelweiss, and your own email list are all viable sources. Aim for at least twenty to thirty ARC readers, knowing that roughly 30 to 50 percent will actually post a review.

Ask at the right moment. The end of your book is the highest-intent moment for a reader who loved it. A brief author's note saying "If you enjoyed this, a review on Amazon or Goodreads makes a real difference and I read every one" is not pushy. It is an invitation. Many readers who would have left a review simply never thought to unless someone asked.

Follow up with your email list. Your launch-week emails should include a direct, personal ask for reviews. Not a guilt trip. A genuine explanation that reviews help other readers discover the book, and that you are grateful for the time it takes.

Review velocity matters. Amazon's algorithm weighs the recency of reviews, not just the total count. Ten reviews posted in the first week outperform the same ten reviews spread over six months. Coordinate your ARC readers and launch team to post in the first 48 to 72 hours.

Amazon Ads basics

Amazon Advertising (formerly AMS) allows authors to run sponsored ads that appear in search results and on competitor book pages. Done well, it is one of the most efficient ways to drive discovery. Done poorly, it is a quick way to lose money with nothing to show for it.

The two ad types worth knowing

Sponsored Products. These appear in search results and on product detail pages. You set keywords you want to target (either author names, book titles, or genre terms), a maximum bid per click, and a daily budget. You pay only when someone clicks your ad. Start with automatic targeting (Amazon chooses keywords for you) for the first two to four weeks to learn what converts, then switch to manual targeting with the keywords that are performing.

Lockscreen Ads (Kindle only). These appear on Kindle devices and apps when the screen locks. They are lower-intent than search ads but can drive significant volume for the right price point and genre. Romance and thriller tend to perform well here.

The number that determines whether ads work

Your KENPC (Kindle Edition Normalized Page Count, for KU titles) or your royalty per sale must exceed your cost per acquisition for ads to be profitable. If you are spending $1.50 to acquire a sale and earning $1.20 in royalties, you are losing money at scale. Know your numbers before you scale your ad spend.

Most authors who give up on Amazon ads did not have a bad ad strategy. They had a listing that did not convert, which means the traffic their ads bought did not turn into sales. Fix the listing first, then run ads into it.

Author Central

Author Central is Amazon's free profile system for authors. Set it up. Claim every book you have written. Then use it well.

A complete Author Central profile includes a professional author photo, a bio written in the third person that establishes your genre credentials and your personality, an editorial reviews section populated with your best blurbs and press quotes, a blog feed (which can pull from your website's RSS feed), and links to your social profiles and website.

When a reader discovers your book and clicks on your name, they land on your Author Central page. For many readers, especially those making a decision about whether to commit to a new-to-them author, this page is what converts them into a fan rather than a one-time buyer.

Why your website matters for Amazon performance

Amazon and your author website are not in competition. They work together, and your website can meaningfully improve your Amazon performance in ways that are often overlooked.

First, traffic sent from your website to your Amazon listing signals to Amazon's algorithm that external sources are driving demand for your book. This external traffic is weighted differently than organic Amazon discovery and can improve your ranking velocity.

Second, your website is where you build the email list that drives launch-week review velocity. The readers who join your list through your website are the most engaged people in your audience, and they are the most likely to post reviews, share the book, and buy your next title at launch.

Third, your website is the destination for all the marketing energy you generate off-Amazon. Podcast appearances, press coverage, BookTok videos, newsletter mentions. Without a professional, well-designed website to land on, that traffic evaporates. With one, it converts into subscribers, readers, and long-term fans.