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July 12, 2026 · 6 min read

Amazon KDP keywords: the 7 backend fields explained (with examples)

Your 7 KDP keyword fields are prime real estate most authors waste. Here's how to fill them — what to put, what to avoid, and how they work with your title and categories.

When you publish on Amazon KDP, you get 7 keyword fields — and most authors either leave them half-empty or stuff them with single words. Used well, they're some of the most valuable real estate you have for getting your book found. Here's how they actually work.

What the 7 fields are

Each of the 7 fields holds a phrase (up to 50 characters). Think of each as a search a reader would type, not a single word. Amazon uses them, along with your title and subtitle, to decide which searches your book shows up in.

The rules that matter

1. Use phrases, not single words. "romance" is a bloodbath; "small town enemies to lovers romance" is a search you can actually rank for. Fill each field with a full buyer phrase.

2. Don't repeat your title. Amazon already indexes your title and subtitle. Don't waste a keyword field on words that are already there — use the 7 fields to cover different searches (genre tropes, comparable authors, reader intent, occasion).

3. Cover how readers actually search. Mix a few broader phrases with several specific long-tail ones. For fiction, lean on tropes and vibes ("cozy mystery with cats"). For nonfiction, lean on the problem and outcome ("how to quit sugar for beginners").

4. Don't keyword-stuff or misuse restricted terms. Don't cram unrelated words, use other authors'/brands' trademarked names, or make subjective claims like "bestselling." Amazon can suppress listings that break these rules.

5. Every character counts, but don't force it. You don't have to fill all 50 characters if it makes the phrase unnatural — a clean, real phrase beats a stuffed one.

A quick example

For a beginner-friendly meal-prep cookbook, weak fields look like: cooking, food, healthy, recipes, meals, diet, book. Strong fields look like:

  • beginner meal prep cookbook
  • healthy meal prep for weight loss
  • easy budget meal planning
  • high protein meal prep recipes
  • weekly meal prep for one
  • make ahead lunch ideas
  • meal prep for busy people

Same book — one of them gets found.

Don't forget categories and title

Keywords work with your title, subtitle, and categories. Put your single strongest phrase in the title/subtitle, pick the most specific categories you qualify for, and let the 7 fields widen your coverage.

Make sure your whole listing pulls its weight

Keywords get you found; your title and description decide whether the reader clicks and buys. Listing Bench grades your KDP listing against what Amazon rewards — title, description structure, and keyword coverage — and rewrites the weak parts in your voice. Grade your book listing free and see where it stands.

Want to know how your listing scores?

Paste an Etsy or KDP listing into Listing Bench and get an honest score in seconds — with the specific reasons it’s weak, and how to fix them. Free, no card to start.

Grade a listing free

Keep reading

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