KDP Keywords for Low-Content Books: How to Fill the 7 Boxes
By NicheFlow team · KDP help pages and Amazon search suggestions last checked Oct 13, 2026
KDP gives every book seven keyword boxes. For a journal, planner or coloring book, use them for the words a shopper would type that aren't already in your title, subtitle or categories: who the book is for, the season or occasion, and what's actually on the pages. Leave out quotation marks, brands you don't own, words like "new" or "bestselling", and anything that doesn't describe the book.
That much comes straight from KDP's help pages. What they don't settle is how long the boxes can be, whether to type full search phrases or loose groups of words, and how much any of it matters. Those are the questions publishers keep asking in the KDP Community, so this post goes through them and then fills the boxes for one real niche.
What KDP's help pages say about keywords
KDP wants keywords that "accurately portray your book's content" and match what customers type. Its keyword page says to "use up to seven keywords or short phrases" and to "keep an eye on the character limit in the text field" (KDP: Make Your Book More Discoverable with Keywords). Word order matters too. KDP's example is that customers search for "military science fiction" but probably not "fiction science military".
The same page has a list of things to keep out of the boxes. For low-content books, these are the ones that come up most:
Anything already in your book's metadata, like the title.
Words already in your categories.
Information common to most items in the category. KDP's own example is "book".
Variants of spacing, punctuation, capitalization and plurals, like "computer" and "computers".
Claims about quality and time-sensitive words such as "new" or "on sale".
Brands you don't own or aren't authorized to use, and Amazon program names like "Kindle Unlimited".
Quotation marks.
KDP's Metadata Guidelines for Books add that keywords can't refer to other authors, sales rank ("bestselling"), promotions ("free"), or "anything that is unrelated to your book's content". It also says plainly: "We do not tolerate keywords that mislead or manipulate our customers."
Phrases or single words? It depends on the quote marks
This is where a lot of people get stuck. The Metadata Guidelines say: "For best results, we recommend using phrases that are 2-3 words long." The keyword page says "Single words work better than phrases, and specific words work better than general ones," but that line sits inside its advice about quotation marks. If you enter complex suspenseful whodunit without quotes, KDP says, "Customers can search for any of those words and find your book."
Our reading is that the two pages mostly don't conflict: the single-words line is about not wrapping a phrase in quote marks. Use short phrases in the order a shopper would type them, skip the quote marks, and don't spend space writing out every combination of the same words. In practice that means putting words that belong together, like a season and a holiday, in the same box.
Is the limit 350 characters or 210 bytes?
An Oct 8, 2026 thread in the KDP Community from an adult coloring book publisher asks exactly this: "Is the actual limit 350 characters or 210 bytes?" The poster's understanding was seven boxes of 50 characters each, and they'd heard a byte limit mentioned in one of KDP's webinars, with a warning that going over it could get the keywords ignored. By Oct 13 the thread had 17 answers. None of the 10 that show without logging in settled the number with a source.
Here's what we could check. KDP's current keyword page doesn't give a number at all. It tells you to watch the limit shown in the text field, and it doesn't mention bytes. We haven't verified the webinar figure. Amazon also hasn't published how the seven boxes are combined, so a firm answer either way is a guess.
The more useful point is that you rarely need every character. The usual padding is the stuff KDP tells you to cut anyway: words from your title, plurals, "book", "notebook". Cut those first. If what's left still runs to the edge of every box, you're probably reaching for words that don't describe the book.
Traps that catch low-content publishers
The Metadata Guidelines list "Repeating generic keywords like "notebook," "journal," "gifts," "books," etc." among the things prohibited in the title field, and say a subtitle "must adhere to the same guidelines as your title." Two members in that Community thread warned against keyword-stuffing the subtitle, and one said it leads to books being blocked. So the title should be the book's real title. The detail goes in the boxes.
For a journal, planner or coloring book, good box material usually falls into a few groups:
Who it's for, like "women over 50", "nurses" or "teens", when the book is really made for them.
The season or occasion: fall, Thanksgiving, retirement, a new baby.
What's on the pages: the prompts, the layout, the scenes or the puzzle type.
Format details shoppers search for, like large print, but only if the book really is large print.
One caution from the same thread: a member told the poster not to use claims like "stress relief", saying KDP would probably block the book. We didn't find that rule on KDP's keyword or metadata pages. Still, describing what's on the page ("fireplace scenes") instead of what the book will do for the buyer is the safer choice, and it's closer to KDP's ask that keywords portray the book's content.
A worked example: the Oct 12 Niche of the Day
On Oct 12, 2026, NicheFlow's Niche of the Day was a Cozy Autumn Hygge Coloring Book: comfort scenes with warm drinks, blankets, fireplaces, fall foliage, chunky knits and gentle woodland animals. NicheFlow's AI estimates put competition at 5/10 and profitability at 8.5/10, with an average BSR around 60,000 and prices from $7.99 to $10.99. That BSR sits inside the 30K to 100K band we use as a rough rule of thumb for steady sales (how to read BSR for KDP), but it's an estimate, not a sales figure.
Say your title is Hygge Autumn: A Cozy Coloring Book for Adults (a made-up example, not a real book). That already covers hygge, autumn, cozy, coloring, book and adults, so none of those words need a box.
Next, KDP's own tip: try your candidate words in Amazon's search bar and "look at the suggestions that appear in the "Search" field drop down." We did that on Oct 13, 2026, around 9:19 AM Pacific, logged out, on the US store. Some of what came back:
"cozy coloring book for women over 50"
"cozy fall coloring book" and "coloring book for adults cozy fall"
"cozy thanksgiving coloring book"
"autumn coloring book for adults and teens"
"hygge coloring book for adults"
Two things stood out. "Fall" comes up as often as "autumn" in the suggestions ("cozy fall coloring book", "fall coloring book for adults"), and it's a different word rather than a plural or spacing variant, so it earns a box even with autumn in the title. And typing "hygge" on its own mostly brought up products that aren't books, so that word does its work next to the book type, which the title already handles. Suggestions change and can differ from shopper to shopper, so run your own on the day you publish.
Here's a made-up example of the boxes for that made-up title. Boxes 1 to 3 come from the suggestions above. Boxes 4 to 6 describe the scenes in the Niche of the Day write-up, so they're only right if your pages really show them:
thanksgiving
women over 50
teens
fireplace warm drinks blankets
fall foliage chunky knits
woodland animals
What we left out, and why: coloring book, adults, cozy, hygge and autumn are in the title. "Coloring books" is a plural. "Relaxing" and "stress relief" promise an outcome instead of describing the pages. "Best" and "new" are on KDP's do-not-use list, and so is any brand you don't own or aren't authorized to use.
This isn't a magic set. Some of it comes from words shoppers type, the rest describes the pages, and none of it is on KDP's list of things to cut. That's about as much as keyword boxes can do.
How to check your keywords are working
Before you publish, KDP suggests searching Amazon with the keywords you're considering: "If you get irrelevant or unsatisfying results, make some changes." Treat it as a fit check. If the results for a phrase look nothing like your book, that phrase probably won't sell it.
After the book is live, search Amazon for one word that appears only in your keyword boxes, together with a distinctive word from your title. If the book shows up, that word is very likely being indexed. That's all the test tells you. It says nothing about where you'll rank for the full phrase.
KDP says "You can change keywords and descriptions as often as you like," so swapping out a weak box costs you nothing but a few minutes. If your book is available in more than one format, KDP also asks you to keep your keywords and description consistent across formats.
Where keywords stop helping
KDP's own keyword page says keywords work "along with factors like sales history and Amazon Best Sellers Rank." Most of the replies we could see in the Community thread made a blunter version of the same point: for a coloring book, don't count on keywords alone, because sales drive where a book shows up. Good boxes won't rescue a niche nobody is shopping in, or a cover nobody clicks.
Amazon's suggestions are free, but they only tell you a phrase gets typed, not how often. If you want estimated search volume per phrase, that's a job for a dedicated keyword tool. Publisher Rocket, for example, describes itself as a keyword, category and ads tool.
Questions people ask about the 7 keyword boxes
Should I type the full search phrase, even if it repeats words from my title?
KDP's guidance points the other way: it lists information already in your metadata as something to avoid in keywords. In the example above, "cozy fall coloring book" becomes "fall" in a box, because cozy, coloring and book are already in the title.
Does Amazon match words across the title and different boxes?
KDP says that with unquoted keywords, "Customers can search for any of those words and find your book." It hasn't published exactly how words from the title and the seven boxes are combined, so the indexing check above is a simple way to see whether a word is being picked up.
Do I have to fill all seven boxes?
No. KDP says "up to seven". Five honest boxes beat seven padded ones.
Before you hit Publish
Run through this once per book:
The title is the real title, with no stacked "journal notebook gift" words.
No box repeats a word from your title, subtitle or categories, and there are no plural or spacing variants.
No quote marks, brand names, program names, "best", "new" or "free".
Every word describes what's on the pages or who the book is for.
Each phrase, searched on Amazon, brings up books that look like yours.
Keywords come after the bigger decision, which is whether the niche deserves the book at all. Our guide to finding profitable KDP niches covers that check. If you'd like a scored idea to start from, NicheFlow's free plan includes one niche search a day and the daily Niche of the Day with its full report, with no credit card needed. Disclosure: NicheFlow is our product, so weigh that accordingly. Its scores and BSR figures are AI estimates, so look at Amazon yourself before you commit.
Drafted with AI assistance and fact-checked before publishing.
