Amazon Keywords for Books: How to Choose the Right 7 KDP Fields in 2026
What Are Amazon Keywords for Books, and Why Do They Matter?
Amazon keywords for books are search phrases entered in your KDP dashboard that signal Amazon's algorithm to surface your book when readers search for relevant terms. When you publish your book on Amazon KDP, the platform gives you exactly 7 keyword fields during the "Book Details" setup step. Each field accepts up to 50 characters, so your total keyword metadata budget is 350 characters combined.
That might sound modest, but those 350 characters carry real weight. Unlike Google SEO, where a click often means someone is still browsing, Amazon search results land in front of purchase-ready readers. A well-chosen keyword phrase connects your book to someone who already has their wallet open. That direct relationship between search phrase and sale is what makes keyword strategy one of the highest-leverage tasks in your entire publishing process.
Keywords don't work in isolation, either. According to Amazon's own KDP documentation, they operate alongside your BISAC category selections and your book description to form the full metadata signal Amazon's A9/A10 algorithm uses to rank and surface your listing. You can read more about how all of these elements fit together in Foglio's guide to mastering book metadata for Canadian self-publishers.
One thing worth addressing immediately: a significant number of indie authors waste two or three of their 7 fields on terms Amazon already indexes automatically, things like their own book title, their author name, or the word "book." Amazon pulls those from your title and author metadata fields without you lifting a finger. Every field you spend on redundant terms is a missed opportunity to reach a reader who'd never have found you otherwise.
What You Need Before You Start Choosing Amazon Keywords
Getting your keywords right starts before you open your KDP dashboard. There's groundwork that'll make the whole process faster and far more effective.
First, you need a live or draft KDP listing. Keywords are entered during the "Book Details" step, and you can change them at any time after publishing. Amazon's KDP help page on adding or changing keywords confirms that updates typically take 24 to 72 hours to index. So don't treat your first set of keywords as permanent; they're a starting point you'll refine over time.
Before you start researching, write down your book's genre, three to five core tropes or themes, the emotional promise of your story, and two or three comparable authors or titles that your target readers already search for. This becomes your keyword brief, and it'll stop you from going blank when you're staring at seven empty fields.
The single most important concept to internalise before you choose a single phrase is reader search intent. You're not looking for words that describe your book from your perspective as the author; you're looking for the exact words a buyer types when they're ready to purchase, not just browse. A reader searching "slow burn romance" has very different intent from someone searching "what is romance fiction."
You'll also want access to at least one keyword research tool. The Amazon autocomplete bar in the Kindle Store is free and surprisingly powerful. For authors who want search volume estimates and competition scores, Publisher Rocket is the most widely used paid option among indie authors.
If you're publishing on Amazon KDP Canada, it's worth noting that Canadian English spelling variants like "honour" vs "honor" or "travelling" vs "traveling" can be worth testing if your content is specifically aimed at Canadian readers. And before you lock in your keywords, confirm your BISAC category selections. As you'll see in the steps below, keywords can be used strategically to access additional Amazon subcategories beyond the two you select manually, but only if your categories and keywords are coordinated. If you're still sorting out the difference between an ISBN and an ASIN for your Canadian listing, Foglio's guide on ISBN vs ASIN in Canada covers exactly that.
How to Choose Amazon Keywords for Your Book: 7 Steps
To choose Amazon keywords for your book: research phrases using Amazon autocomplete and a tool like Publisher Rocket, match each phrase to a specific reader intent, prioritise long-tail terms, and use at least one field to access a hidden Amazon subcategory. Here's how each of those steps works in practice.
Step 1: Mine Real Reader Language with Amazon Autocomplete
Open the Amazon Kindle Store search bar and start typing your genre. Don't press enter; just watch the auto-suggestions appear. Every phrase Amazon suggests is drawn from actual reader searches the platform is already completing. Write down every suggestion that's relevant to your book. Do this with five or six seed terms: your genre, your main trope, your setting, your primary character type. You'll quickly build a list of 20 to 30 candidate phrases. This approach is discussed regularly in the self-publishing community, including this Reddit thread on finding KDP keywords, where indie authors share their real-world methods.
Step 2: Validate with a Keyword Research Tool
Take your top five autocomplete phrases and run them through a keyword research tool. The Amazon Keyword Tool on Keyword Tool Dominator provides word frequency data based on Amazon searches and can help you identify which phrases get consistent traction. If you're using Publisher Rocket, you'll see estimated monthly search volumes and competition scores. Look for phrases with meaningful search volume and manageable competition; you don't need the highest-traffic term, you need the most winnable one.
Step 3: Map Each Keyword to a Reader Intent Category
Before you commit to any phrase, categorise it by the type of reader intent it represents. The five most effective intent categories for book keywords are: genre plus format (for example, "cozy mystery series"), trope-based (for example, "enemies to lovers fantasy"), mood or setting (for example, "dark academia romance"), character type (for example, "female detective thriller"), and comparable title framing (for example, "books like Tana French"). Aim to cover at least three different intent categories across your 7 fields. This is covered in detail in Foglio's guide to choosing keywords for print-on-demand books.
Step 4: Prioritise Long-Tail Phrases
A keyword like "small town romance with grumpy hero" will outperform the single word "romance" almost every time for a debut or mid-list author. The single word carries thousands of competing titles; the long-tail phrase attracts a reader who knows exactly what they want and is far more likely to buy. Foglio's guide on long-tail vs short-tail keywords for POD books breaks down exactly why specificity beats volume at this stage of a book's discoverability lifecycle.
Step 5: Use One Field to Access a Hidden Subcategory
This is one of the most underused tactics available to indie authors. Amazon's KDP keyword documentation confirms that entering specific phrases like "short stories," "lgbtq," or "clean romance" can place your book into Amazon subcategories that aren't available through the standard category browser. You can also find a walkthrough of this in this YouTube guide to KDP keyword strategy. Dedicate at least one of your 7 fields to a subcategory-unlocking phrase. Landing on a subcategory bestseller list, even a niche one, adds a badge to your listing that builds immediate reader trust.
Step 6: Cross-Reference Keywords Against Your Book Description
Amazon's A10 algorithm checks for consistency between your keyword metadata and the content of your book listing. A keyword that appears in your 7 fields but has zero relevance to your book description sends a weak relevance signal and can hurt your ranking rather than help it. Before you finalise your keyword list, read your description and confirm that each keyword phrase is genuinely reflected in the themes, tone, or genre your description communicates.
Step 7: Publish, Monitor, and Iterate
Log your 7 chosen phrases in a simple spreadsheet, publish, and then review your Amazon Sales Rank and category placement after 30 days. If you haven't placed in the top 100 of at least one subcategory, identify your lowest-intent keyword and replace it with a more specific long-tail phrase. Keyword optimisation is iterative, not a one-time task. You can change your KDP keywords at any time, and testing is the only way to know what actually works for your specific book in your specific niche.
Three things never to put in your keyword fields: your own book title or author name (Amazon indexes these automatically), any other author's name (this violates KDP's terms of service and can get your book suppressed), and single generic words like "book" or "novel" (they're too broad and too competitive to drive meaningful traffic). Canadian authors can also relax: your KDP keywords apply globally across all Amazon storefronts from a single dashboard entry, so there's no need to create a separate keyword strategy for Amazon.ca vs Amazon.com.
Pro Tips for Getting More from Your Amazon Book Keywords
Once your 7 fields are filled with solid intent-mapped phrases, there are several ways to squeeze more performance out of your keyword strategy over time.
Seasonal and trend-based keywords can give your title a short-term ranking lift when demand spikes. Phrases like "summer beach read romance" or "BookTok fantasy" attract readers during specific windows of elevated interest. Update these fields four to six weeks before the relevant season or trend peaks so Amazon has time to index the changes before demand arrives. Amazon's keyword guidelines don't restrict seasonal language, so there's no risk in rotating these in and out.
Trope keywords consistently outperform vague genre labels in terms of purchase intent. A reader searching "slow burn enemies to lovers" knows what they want and is far closer to clicking "buy" than someone searching "romance novel." If you're not already thinking in tropes, start. They're the language readers actually use, especially the readers who discovered books through social media.
Your Author Central profile is another layer of the same system. The editorial descriptions and contextual content you add there provide additional signals to Amazon's A10 algorithm that work in tandem with your KDP keyword fields. Treating Author Central as a separate task from keyword strategy means leaving relevance signals on the table.
If your book is in a competitive genre, consider using two or three keyword fields to target adjacent low-competition niches. A thriller author targeting "psychological suspense Canadian setting," for example, faces far less competition for a top-100 subcategory spot than one targeting "thriller" outright. This approach is central to how Canadian authors are getting their books in front of readers without massive advertising budgets.
One zero-cost competitive research method: search comparable authors on Amazon, scroll to the "Customers also bought" section, and study the category placements of the books that appear. Those placements tell you which keywords and subcategories are working for books like yours right now. You can apply the same logic when publishing your book on Amazon Canada to identify where Canadian reader demand is concentrated.
If keyword research feels like a lot to manage alongside writing, editing, design, and distribution, that's because it is. Foglio Publishing's done-with-you service includes metadata and keyword strategy guidance as part of the full publishing support process, so you don't have to piece together a strategy alone. You can also grab Foglio's self-publishing checklist to make sure keywords are part of a complete pre-launch plan, and their Kindle self-publishing guide covers the broader Amazon publishing picture if you're newer to the platform.
Amazon Keywords for Books: Frequently Asked Questions
How many keywords can you add to a book on Amazon KDP?
Amazon KDP provides 7 keyword fields for every book listing. Each field accepts a phrase of up to 50 characters, giving you a combined maximum of 350 characters of keyword metadata. You can use each field for a multi-word phrase rather than a single word to maximise the number of search terms you cover.
Can you change your Amazon book keywords after publishing?
Yes. You can update your KDP keywords at any time by logging into your KDP dashboard, navigating to your book's details page, and editing the keyword fields. Changes typically take 24 to 72 hours to be indexed and reflected in Amazon search results.
Should you use your book title as a keyword on Amazon?
No. Amazon automatically indexes your book's title, subtitle, and series name as searchable metadata. Repeating these in your 7 keyword fields wastes your limited keyword budget on terms Amazon already captures. Use all 7 fields for phrases that extend your discoverability into new search territories.
Can you use another author's name as a keyword on Amazon KDP?
No. Using another author's name as a keyword violates Amazon KDP's content guidelines. Amazon can suppress or remove your book from search results if it detects this practice. Instead, use trope-based or theme-based phrases that attract the same reader audience without naming a specific author.
Do Amazon book keywords work the same on Amazon.ca as on Amazon.com?
Yes. Keywords entered in your KDP dashboard apply to your book listing across all Amazon international storefronts, including Amazon.ca, Amazon.co.uk, and Amazon.com.au. You don't need to create separate listings or keyword sets for the Canadian marketplace. However, if your book targets a Canadian audience, including Canadian-specific setting or cultural keywords can help attract geographically relevant readers.
What is the difference between Amazon KDP keywords and BISAC categories?
BISAC categories are the two primary genre classifications you select manually during KDP setup; they place your book in Amazon's browse hierarchy. Keywords are backend search phrases that influence which search queries surface your book. Critically, specific keywords can also access additional Amazon subcategories beyond your two manual selections, making keyword and category choices complementary rather than redundant.
What are the best free tools for finding Amazon book keywords?
The Amazon Kindle Store autocomplete bar is the most accessible free tool: type a genre or theme and note every auto-suggested phrase. Browsing Amazon category bestseller lists and observing the keywords used in top-ranking book descriptions and subtitles is another no-cost method. For paid options, Publisher Rocket is the most widely used dedicated tool among indie authors and provides search volume and competition data specific to Amazon's book marketplace.
Amazon KDP keywords are backend metadata phrases, not visible to readers, that Amazon's algorithm uses to match your book to relevant search queries. Getting them right is one of the most direct ways to improve your book's discoverability without spending a dollar on advertising. If you're also keeping an eye on what Amazon KDP royalty changes mean for your publishing strategy, or comparing Amazon against other options in our self-publishing platforms guide for Canadian authors, keyword optimisation fits into a broader picture of building a sustainable author presence. Seven fields, 350 characters, and the right phrases can make the difference between a book that sits unseen and one that consistently finds its readers.
