If you want to know how to increase book sales on Amazon, the answer is rarely one thing — it's a stack of marginal gains across keywords, cover, pricing, reviews, and ads. Get each layer right and they compound. Miss one and you leave visibility on the table. Here are twelve strategies that actually move the needle.
1. Optimize Your KDP Keywords
Amazon gives you 7 keyword fields during book setup. Each field accepts up to 50 characters, and the words should be separated by spaces — not commas. What most authors get wrong is treating these fields as 7 separate slots. Amazon actually combines every field into a single search index, which means each word only needs to appear once across all 7 fields. Repeating words wastes character space you could use on additional terms.
The backend limit is 249 bytes in US, UK, and EU marketplaces (500 bytes in Japan, 200 bytes in India). That distinction matters — the limit is measured in bytes, not characters. Exceed it by a single byte and Amazon silently de-indexes every backend term you entered. You won't get an error. The fix is to keep a running byte count as you build your keyword string.
Never repeat words already in your book title — Amazon already indexes the title, so title words in the keyword fields are redundant. Use those characters for terms that aren't covered elsewhere in your listing. Check our KDP niche pages for category-level keyword ideas and see what's driving traffic in your genre.
2. Write a Compelling Book Description
Your book description has a hard ceiling of 4,000 characters — and that limit includes every HTML tag you use for formatting. A well-structured description with bold headers and paragraph breaks can leave you with roughly 300–400 words of visible text once the tags are accounted for, so every word counts.
KDP supports a specific set of HTML tags: <b>, <i>, <br>, <h1> through <h3>, and <p>. Unsupported tags like <ul>, <a>, and <img> will either be stripped or show up as raw angle brackets — which looks terrible on a product page. Stick to the supported set.
On mobile, Amazon truncates the description behind a "Read more" link, so the most compelling hook needs to be in the first two or three sentences. Write the opening line as if it's the only line a reader will see. Front-load the benefit or the conflict, then layer in detail below for readers who tap through.
3. Perfect Your Book Cover
The cover is your primary conversion asset. For eBooks, the ideal cover dimensions are 2,560 pixels (height) by 1,600 pixels (width), with a minimum recommended height of 2,500 pixels and an ideal height-to-width ratio of at least 1.6:1. The absolute minimum Amazon will accept is 1,000 x 625 pixels — but uploading at minimum resolution is a shortcut that costs you quality in search results and on product pages.
Accepted file formats are TIFF (.tif/.tiff) or JPEG (.jpeg/.jpg), with a maximum file size of 50 MB. The color profile must be RGB — CMYK and color separation are not supported.
For the marketing cover image used in the Amazon store, the format must be JPEG, maximum 5 MB, and at least 300 DPI. If your cover has a white or very light background, add a 3–4 pixel medium gray border so the cover has definition against the white page background. One thing the KDP content policy explicitly prohibits: mentioning pricing or temporary promotional offers directly on the cover image.
4. Choose the Right Price and Royalty Tier
Amazon KDP offers two eBook royalty tiers. The 35% tier has no delivery costs and a minimum price of $0.99. The 70% tier requires a minimum price of $2.99, but delivery costs based on file size are deducted from each sale. For most text-heavy books where the file size is small, the 70% tier is clearly better math — but if you're pricing at $0.99 for a launch promotion, you're in the 35% tier whether you like it or not.
Paperback royalties are fixed at 60%, regardless of price. Use the KDP Royalty Calculator to model different price points before you publish — small pricing shifts can significantly change your take-home per sale, especially once print costs are factored in.
5. Enroll in KDP Select
KDP Select is a 90-day exclusivity commitment that comes with meaningful benefits. Your eBook goes into Kindle Unlimited and the Kindle Lending Library, opening you up to page-read royalties from KU subscribers. You also get access to Kindle Countdown Deals, which display a countdown timer to shoppers and can create urgency around a promotional price.
Each 90-day term gives you up to 5 free promo days, where you can list the book at zero cost to drive downloads and boost ranking. KDP Select also comes with enhanced algorithmic visibility on Amazon — books in Select tend to surface more in also-bought recommendations and browse placements. The trade-off is exclusivity: the eBook cannot be sold through other retailers during the enrollment period.
6. Run Amazon Ads
Amazon Advertising is the most direct way to put your book in front of readers who are already searching. You can target by keyword — specific search terms your readers are likely to use — or by product, including placement directly on competitor book pages.
The standard profitability metric is ACoS (Advertising Cost of Sale). A campaign is profitable when your ad spend is less than the profit you earn from the sales it drives. Start with automatic campaigns to discover which terms convert, then manually build campaigns around your winners. Track your BSR Sales Calculator rankings alongside ad spend to see how rank responds to paid traffic.
7. Build Reviews Strategically
Verified reviews carry more weight than unverified reviews on Amazon book listings. The most reliable way to build a verified base is to generate sales — which is why the recommended launch sequence is: secure ARC (Advance Review Copy) reviews first to establish social proof, then launch a targeted Amazon Ads campaign, then optionally layer in a price promotion to widen reach. Stacking these in order gives each lever the foundation it needs to work.
8. Optimize Your Categories
Amazon has tens of thousands of book categories, and choosing the right ones affects both discoverability and your ability to earn a Best Seller badge. Narrow subcategories with lower competition can be easier to rank in than broad genres, and a Best Seller badge in a relevant niche carries genuine social proof. Use research tools that let you filter and compare categories before you commit — browsing our KDP niche pages is a good starting point for understanding which categories have room for new entrants.
9. Use Amazon Author Central
Author Central is Amazon's platform for claiming your books, building an author profile, and accessing reader analytics. A complete profile — biography, photo, linked social or blog feeds — gives readers a reason to follow you and can increase conversion when readers land on your author page. Claim your books through Author Central and make sure all editions are correctly linked to one profile.
10. Use KDP Dashboard Promotions
The KDP Dashboard includes built-in marketing tools that are easy to overlook. Pre-orders let you build ranking momentum before a book's release date — sales during the pre-order window can count toward launch rank. Price promotions, available through the dashboard, let you run time-limited discounts that can be coordinated with email lists, reader groups, or social campaigns for a concentrated visibility push. Explore the KDP how-to guides for step-by-step walkthroughs of each tool.
11. Research Your Competitors
Understanding what's working for comparable books is one of the fastest ways to improve your own listing. Reverse keyword tools reveal the specific terms any given book ranks for — giving you a direct window into what Amazon's algorithm is indexing. Analyzing the top performers in your category tells you which keywords to prioritize, how they're structuring their descriptions, and where their pricing sits. Don't guess at what's working. Look it up.
12. Track Performance and Iterate
BSR (Best Sellers Rank) is the most accessible signal for how well a book is selling relative to its category. A rank that's improving over days or weeks tells you something is working. A rank that's drifting up tells you to investigate. The BSR Sales Calculator translates rank numbers into estimated monthly sales so you can benchmark your book against the competition and spot trends early.
The Pubscout Chrome Extension surfaces live BSR, estimated monthly sales, and niche data directly on any Amazon book page — useful for competitive research and for checking your own listings without leaving the browser.
Selling more books on KDP is an iterative process. Set a cadence for reviewing your keyword fields, description, and ad performance — and treat each change as a test with a measurable outcome. The authors who compound their results are the ones who stay systematic about it.