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KDP keywords: filling all 7 slots well
Keywords are how Amazon’s search connects readers to your book — and most authors waste half their slots. Here’s the strategy, a free research method using Amazon’s own data, and worked examples.
How the slots actually work
Each of the 7 slots holds up to 50 characters, and Amazon indexes the wordswithin a slot in any order and combination. That changes the strategy: don’t burn a slot on one two-word phrase. Pack each slot with related terms that recombine well — “cozy mystery small town amateur sleuth woman” covers a dozen real queries in one slot.
Don’t repeat anything from your title, subtitle, or categories — those are already indexed. Every repeated word is a slot doing nothing.
The free research method
1.Open Amazon in an incognito window (so your history doesn’t skew suggestions), set the search dropdown to Kindle Store or Books.
2.Type your core topic slowly and record every autocomplete suggestion — these are real customer searches, roughly ordered by volume. Mine deeper by appending letters: “grief journal a”, “grief journal b”…
3.Search each candidate phrase and judge the results page: thousands of results with strong sales ranks means brutal competition; a page of weak, old, or barely relevant results means opportunity. The sweet spot is a query readers clearly use where you’d plausibly be a top-ten result.
4.Sort your list into 7 themed slots: genre/trope terms, setting, protagonist type, reader problem or benefit (nonfiction), mood, comparable-style descriptors (“like a hallmark movie” — style words, not author names), and occasion/audience (“gift for retired dad”).
Worked examples
Christian memoir (like our customers’ books): faith after loss healing testimony, christian women inspirational true story, grief hope encouragement devotional gift
Cozy mystery: small town amateur sleuth woman detective, bakery culinary cozy crime series clean, funny lighthearted whodunit beach read
Business nonfiction: side hustle passive income beginners guide, quit your job freedom entrepreneur mindset, small business marketing startup step by step
Your listing kit, written for you.
Every publish.ai package includes an Amazon listing kit — description in KDP-ready HTML, seven researched keyword slots, and category suggestions — generated from your actual manuscript, not a template.
Common questions
How many keywords does KDP allow?＋
Seven slots, up to 50 characters each. Each slot takes a phrase, and Amazon matches the individual words in any order — so 'cozy mystery small town' can surface you for 'small town mystery' too. You don't need commas; spaces work as separators within a slot.
What keywords are not allowed on KDP?＋
Other authors' names or book titles, brand names you don't own, 'free', 'bestseller', 'new', 'on sale', subjective claims ('best book'), and anything unrelated to your content. Violations can get your book suppressed from search — quietly.
How do I research KDP keywords for free?＋
Amazon's own search bar is the database: type your genre or topic slowly in an incognito window and record every autocomplete suggestion — those are real customer queries ranked by volume. Repeat with letters appended ('christian devotional a', '…b') to mine deeper. Then check each phrase's results page: you want queries with real demand but not 50,000 competing titles.
Should I repeat words from my title in keywords?＋
No — your title, subtitle, and categories are already indexed. Slots repeating what Amazon already knows are wasted; use them for phrases that aren't in your title: settings, tropes, reader problems, occasions ('gifts for new moms'), and adjacent topics.
Can I change keywords after publishing?＋
Yes, anytime, from your Bookshelf — changes take effect within about 72 hours. Reviewing keywords 30 days after launch (what's driving impressions?) is one of the few free marketing levers you can keep pulling.
Do KDP keyword tools like Publisher Rocket work?＋
They repackage the same Amazon search data with volume estimates — convenient, not magic. The free method (Amazon autocomplete + judging the competition on results pages) finds the same phrases with more effort. Start free; buy tools when keyword research is your bottleneck, not before.
Related: KDP categories guide, description HTML generator, how to publish, step by step.