How do Amazon keywords work for books?

Full Answer:

Amazon keywords are one of the most underused marketing tools available to self-published authors. When you set up your book on KDP, you can enter up to seven keywords or keyword phrases, each up to 50 characters long. These keywords tell Amazon’s search algorithm when to show your book in search results — and since most book purchases on Amazon begin with a search, getting your keywords right directly affects discoverability.

The most important principle is to think in phrases, not individual words. A single word like “romance” is too broad — your book will compete against millions of titles. A phrase like “small town second chance romance” is specific enough to match actual reader search behavior while being narrow enough that your book can rank for it.

Here’s how to build an effective Amazon keyword strategy using your seven keyword slots:

• Use long-tail keyword phrases — specific phrases like “small town romance with dogs” outperform single-word KDP keywords
• Fill all seven keyword slots — each slot increases your chances of being discovered in Amazon search
• Leverage Amazon autocomplete — use real search suggestions to find high-intent Amazon book keywords
• Mix keyword types — include genre, tropes, tone, character types, and themes for broader reach
• Avoid redundancy — don’t repeat keywords already in your title, subtitle, or categories
• Stay compliant — never use competitor names, misleading claims, or banned keyword terms

To find effective keywords, start with Amazon’s own search bar. Begin typing a phrase related to your book and watch the autocomplete suggestions. These suggestions reflect actual search behavior — if Amazon suggests “enemies to lovers fantasy romance,” that means readers are searching for that term with enough frequency for Amazon to surface it. Note these suggestions and build your keyword list from them.

Each keyword slot can contain a phrase of multiple words. Use all 50 characters when possible. “Small town romance with dogs” uses more of the available space and matches more potential search queries than a single word like “dogs.” You do not need to include words that are already in your title, subtitle, or category selection — Amazon uses those for search matching automatically.

Aim for variety across your seven keyword slots. If all seven keywords are variations of the same concept, you are limiting your discoverability. Mix genre-specific terms, setting descriptors, mood/tone words, trope identifiers, character types, and thematic elements. For a mystery novel, your keywords might include phrases like “female sleuth cozy mystery,” “small town murder investigation,” or “lighthearted mystery with humor.”

Avoid wasting keyword slots on irrelevant or overly general terms. “Book” and “novel” are not useful keywords — every result on Amazon is a book. Similarly, do not use author names, competitors’ book titles, or misleading terms. Amazon’s keyword policy prohibits using other authors’ names or references to sales rank (like “bestseller”) in your keywords.

Review and update your keywords periodically. If certain KDP keywords are not generating impressions, replace them with new options. Keyword optimization is iterative — test, measure, and refine over time.

Tools like Publisher Rocket, KDSpy, and Amazon’s advertising platform can provide data on search volume and competition, helping you identify Amazon book keywords that balance demand with achievable ranking potential.

If you’re managing your book metadata, positioning, and launch strategy together, using a writing platform for authors can help you align your manuscript, categories, and keyword strategy in one place.

Sources:

• Amazon KDP Help: Choose Keywords
• KDP Advertising: Keyword Research Tools
• Kindlepreneur: Keyword Strategy Guide