You picked three categories, filled in seven keywords and pressed Publish. A week later your book is nowhere to be found when you search for it, the category you wanted isn't on the product page, and nobody at KDP will tell you which shelf to choose. This guide explains how Amazon KDP categories and keywords actually work in 2026, how to choose them step by step, how to check what Amazon is really showing, and what to do when a category disappears.
The rules below come from KDP's own help pages on categories, keywords and metadata. Amazon updates them from time to time, so check the current versions before big changes.
Why your book isn't showing up where you expected
The usual causes are simple: categories that don't match the book (KDP says it may remove or change unrelated categories), a category Amazon has since changed or retired, keywords that repeat words Amazon already has from your title or categories, or checking before the 72 hours a new placement can take. None of these is a penalty, and every one can be fixed from your Bookshelf.
How categories and keywords work together
Categories are the shelves a reader browses; keywords are the words a reader types into search. KDP says the two work together to tell Amazon where to "shelve" your book, and keywords can help place it when no precise category exists.
| Field | Limit | What it does | Where to edit |
|---|---|---|---|
| Categories | 3 per format | Places the book on browsable shelves in the Amazon store | Bookshelf > "…" > Edit details > Categories |
| Keywords | 7 boxes per format, with a character limit per box | Helps the book match what readers type into search | Bookshelf > "…" > Edit book details > Keywords |
| Primary audience | Required before categories | Decides which categories you can pick (for example children's or adult) | Details tab |
| Primary marketplace | One per format | Decides which store's category list you see, and sets your list price base | Details tab |
| Title and subtitle | Together under 200 characters | The most-used search attribute, according to KDP | Details tab (print titles lock soon after first publication) |
Each format is its own listing with its own three categories and seven keyword boxes, and KDP does not copy them across. Some categories exist for one format but not another, so pick the best match for each.
What changed: three categories, chosen directly
If you read older guides, you will see advice to email KDP support and ask for up to ten categories. That belonged to the old system. Today KDP's categories page describes a simple rule: you select three categories when you create or edit a book, choosing them directly from Amazon's store categories for your primary marketplace. The same page also says KDP Support cannot give you specific recommendations or strategies for picking categories, so the research is your job (or your publishing partner's).
If you have an older book, note the categories its live product page shows before you edit it, so you can undo a change you regret.
Step 1: set your primary audience and marketplace first
KDP won't let you choose categories until two things are set on the Details tab:
- The sexually explicit images or title question. You must answer Yes or No. Answering Yes makes the book ineligible for children's categories and means it won't appear in general product searches.
- Reading age (optional, but important for some books). For children's categories, KDP asks you to set a reading age of 0-2, 3-5, 6-8 or 9-12. For Teen & Young Adult, set it between 13 and 17. Amazon.de uses 12-15 for Teen & Young Adult. If you skip reading age on a children's book, it may not be eligible for the children's categories you chose.
- Primary marketplace. This is the Amazon store where you expect most of your sales. The category list you see comes from that store, and categories differ between, say, Amazon.com and Amazon.co.uk. Changing it on a published book can also affect your list price, so recheck the Pricing page afterwards.
Step 2: research categories the way a reader shops
KDP's own tips are to research your genre, pick accurate categories, and balance popularity with relevance. Here is how to do that in about an hour.
- List five to ten comparable books. Pick recent, self-published or small-press titles that a reader of your book would also buy. Skip the giant bestsellers; their broad categories tell you little.
- Read their category lines. On each book's Amazon page, scroll to Product details. The Best Sellers Rank section shows the categories the book ranks in. Note them down.
- Browse the shelves yourself. Open the subcategories under your genre in the Amazon store. Would your book look at home among the books shown?
- Look for patterns. A subcategory most of your comparable books share is probably a real shelf for your readers.
- Check the KDP category picker. Not every store category appears in KDP straight away. KDP says that if a new store category isn't in its list yet, you should pick the closest available match and wait.
Step 3: choose your three categories
A simple way to fill three slots is to give each one a job:
| Slot | Job | What to look for |
|---|---|---|
| 1 | The exact shelf | The narrowest category that describes your book accurately, where your comparable books sit |
| 2 | The second angle | A different, still accurate way to describe the book, such as setting, theme or reader problem |
| 3 | The broader home | A wider parent category so the book also appears where general readers of the genre browse |
Here is an illustration (not a client book; category names simplified, so always use the paths in your own KDP picker).
Example: a cozy mystery set in a seaside village
- Slot 1: Mystery > Cozy > a subcategory that matches the sleuth, such as an amateur sleuth shelf.
- Slot 2: a shelf that reflects the setting or theme, if one exists and comparable books use it.
- Slot 3: the broader Mystery shelf.
What you should not do is chase a "small" category that has nothing to do with your book because it looks easy to rank in. KDP's metadata guidelines say it does not tolerate categories chosen to mislead or manipulate customers, and its categories page says unrelated categories may be removed or changed. And even if it survives, the readers browsing that shelf aren't looking for your book.
Step 4: write seven keywords that earn their place
KDP gives you up to seven keyword boxes. Its metadata guidelines recommend short phrases of two to three words, and its keywords page suggests five useful types:
- Setting (for example Colonial America)
- Character types (single dad, veteran)
- Character roles (strong female lead)
- Plot themes (coming of age, forgiveness)
- Story tone (dystopian, feel-good)
For non-fiction, think about the reader's problem, role and goal, such as "bookkeeping for contractors" or "first-time manager". The same three-slot idea works there too: an exact subject shelf, a shelf for who the book is for, and a broader parent.
How to build your seven
- Brainstorm 20 to 30 phrases a reader might type, drawing on your book's setting, characters and themes and on reviews of similar books.
- Type each phrase into the Amazon search bar. KDP's advice is to look at the suggestions in the search drop-down and check that the results look like your book. If the results are unrelated, drop the phrase.
- Remove anything already covered elsewhere: your title, subtitle, author name and the words in your categories.
- Combine words in natural reading order. KDP's example: readers search "military science fiction", not "fiction science military".
- Leave out quotation marks. KDP explains that quoted phrases only match searches containing every word.
- Keep the best seven and save the rest as a reserve list.
Keywords KDP tells you to avoid
| Avoid | Example | Why |
|---|---|---|
| Words already in your metadata | Your title or author name | Amazon already indexes them |
| Words already in your categories | "19th Century History" when that is a category | Wastes a slot |
| Quality claims | "best novel ever" | Subjective, not allowed |
| Time-sensitive words | "new", "on sale", "available now" | Not allowed |
| Sales rank or promotions | "bestselling", "free" | Prohibited in metadata |
| Other authors, their books, or brands you don't own | A famous author's name | Misleading; KDP has zero tolerance for this |
| Amazon program names | "Kindle+", "KDP Select" | Specifically listed by KDP |
| Spacing, plural and capital variants | "cookbook" and "cookbooks" | Amazon treats these as the same |
| Generic words | "book" | Common to everything in the category |
Step 5: make the title, subtitle and description agree
Categories and keywords don't work alone. KDP calls the title the most frequently used search attribute, and its rules for titles are strict: the title field must contain only the title as it appears on the cover, and it can't repeat generic keywords, mention other authors or say things like "bestselling" or "free". Title and subtitle together must be under 200 characters, and KDP notes that customers are more likely to skim past titles longer than 60 characters.
A subtitle can state honestly what the book is ("A Cozy Seaside Mystery"), but it is not a place to stack keywords, and KDP does not accept keyword lists or tag phrases in the description either. Write the description for readers; its natural language will reinforce your keyword boxes. Our guide to self-publishing on Amazon KDP covers every field in the form.
KDP also asks you to keep keywords and descriptions consistent across formats. If your ebook and paperback describe the book differently, readers and Amazon both get a muddled picture.
Step 6: publish, wait 72 hours, then check the live page
- Save, go through to the Pricing page and click Publish. Changes only take effect once published.
- Wait up to 72 hours. KDP says new category placements can take that long to show.
- Open your book's live Amazon page and scroll to Product details. Check which categories appear under Best Sellers Rank. Your KDP form shows what you asked for; the live page shows what readers see.
- Search three or four of your keyword phrases in a private window. A new book won't be at the top, but it should appear among similar titles for specific phrases.
When a category disappears or looks wrong
| What you see | Likely cause | What to do |
|---|---|---|
| New categories not showing | Less than 72 hours since publishing | Wait, then check again |
| A category vanished from the product page | Amazon changed or retired that category, or judged it unrelated | Pick a new accurate category in KDP and republish; check the description supports it |
| Book removed from children's or teen shelves | Sexually explicit flag set, or reading age missing or wrong | Review the Primary audience answers and reading age |
| Category you want isn't in the KDP picker | New store category not added to KDP yet, or not available for that format | Pick the closest match now; use keywords to describe the specific niche |
| Book doesn't appear for your own keywords | Phrases too broad, repeated from the title, or unrelated to results | Swap in more specific phrases a reader would type and test them in search first |
If you believe a category was removed by mistake, contact KDP support and explain, using your book's content, why it fits. But if a reader browsing that shelf would be surprised to find your book, the removal was probably right.
How often should you change categories and keywords?
KDP says you can change keywords and descriptions as often as you like, but constant changes make it impossible to tell what worked. A sensible rhythm:
- Before launch: set everything properly. Our KDP book launch checklist shows where this fits.
- Two to four weeks after launch: check the live page and your searches, and swap two or three weak phrases from your reserve list. Change one thing at a time and give it a couple of weeks.
- Every few months, and before any promotion: recheck the live categories, because Amazon updates them without warning. Our guide to KDP royalties and pricing covers the price side of a promotion.
KDP categories and keywords checklist
- Primary audience, reading age and primary marketplace are set correctly for each format.
- You have listed five to ten comparable books and noted the categories on their live pages.
- Each format has three accurate categories: an exact shelf, a second angle and a broader home.
- All seven keyword boxes contain specific two-to-three-word phrases a reader would type.
- No keyword repeats your title, author name or category words.
- No other authors, brands, program names, "free", "bestselling" or quality claims anywhere in your metadata.
- Title matches the cover; subtitle is honest and readable; description has no keyword list.
- Keywords and description are consistent across ebook, paperback and hardcover.
- Changes were published, and the live product page was checked after 72 hours.
Good metadata helps readers find your book, but it can't fix a weak cover. If readers find you and don't buy, check the cover, description and price. Our cover design team can tell you whether your cover fits the shelf you chose.
Frequently asked questions
How many categories can I choose on KDP?
You can choose three categories for each format of your book, so an ebook and a paperback each have their own three. You choose them directly from Amazon's store categories for your primary marketplace. Older advice about emailing KDP support for up to ten categories no longer applies.
How many keywords does KDP allow?
KDP gives you seven keyword boxes per format, each with a character limit. KDP recommends short phrases of two to three words that describe your book the way a reader would search, such as setting, character type, theme or tone.
Should I repeat my title or category in my keywords?
No. KDP lists words already in your title, contributor names or categories as keywords to avoid, because Amazon already uses that information. Use those slots for other specific phrases readers type.
How long do KDP category and keyword changes take?
After you publish the change, KDP says new category placements can take up to 72 hours to show on Amazon. Check your book's live product page after that, not just your KDP form, to see which categories readers actually see.
Why did my book disappear from a category?
The usual reasons are that Amazon changed or retired the category, KDP judged it unrelated to your book, or your primary audience settings (such as the sexually explicit question or reading age) make it ineligible. Choose an accurate replacement and republish.
Can I use another author's name as a keyword?
No. KDP prohibits keywords that refer to other authors, their books, or brands you don't own, and says it has zero tolerance for metadata meant to mislead customers. Breaking this rule can lead to your book being removed.
Want your categories and keywords set up properly?
The Authors Prime has published 500+ books, and our services start from $200. Our Amazon KDP publishing team can research your categories, write your seven keywords and check your title, subtitle and description against KDP's rules, all inside your own account so you keep your rights and royalties. If you're planning a launch, our book marketing service can line your metadata up with your promotion. Any prices we discuss are general guides, not quotes, until we have seen your project. We can't promise sales or rankings, but we can make sure the right readers can find your book. Book a free consultation or call us at +1 205-301-7751. There is no obligation.