PublishRank Keyword Research Tool — How It Works

The PublishRank Keyword Research tool helps you find the exact phrases real Amazon shoppers type when they're looking for books like yours. It pulls search volume estimates, competition scores, and related keyword suggestions so you can pick the terms most likely to get your book seen. Instead of guessing which seven keyword slots to fill in KDP, you make decisions backed by actual data.

Why Keyword Research Matters on Amazon KDP

Amazon is a search engine. Not a bookstore with friendly staff who hand-sell your novel. When a reader types "cozy mystery small town cat" into that search bar, Amazon's algorithm decides which books show up first. Your book's visibility depends almost entirely on whether you've targeted the right keywords.

KDP gives you seven keyword slots (each up to 50 characters). That's it. Seven chances to tell Amazon what your book is about and who it's for. Pick vague, overly competitive terms and you'll be buried on page 47. Pick hyper-specific terms nobody searches for and you'll rank first for an audience of zero.

The sweet spot is somewhere in between: keywords with decent search volume and competition you can actually beat. That's the whole point of doing research instead of winging it.

How the PublishRank Keyword Research Tool Works

You start by entering a seed keyword. This is a broad term related to your book's genre, topic, or niche. Something like "fantasy romance" or "productivity journal" or "toddler bedtime stories."

The tool then returns a list of related keywords along with key metrics for each one:

• Estimated search volume — how many times per month shoppers search for that term on Amazon.
• Competition score — a quick read on how many established books already target that keyword.
• Related suggestions — long-tail variations you might not have considered. These are often where the real opportunities hide.

You can sort and filter results to zero in on keywords that match your book. The goal is to walk away with a shortlist of 10 to 20 strong candidates, then narrow those down to your final seven for KDP.

What Makes a Good KDP Keyword

Not all keywords are equal. Here's what to look for when you're evaluating your results:

Relevance comes first. A keyword can have massive search volume, but if it doesn't accurately describe your book, it's worthless. Amazon tracks buyer behavior. If shoppers click your book from a keyword search and then immediately bounce, that hurts your ranking over time.

Search volume needs to be real but not astronomical. A keyword with 50,000 monthly searches sounds exciting until you realize you're competing against 12,000 other books. A keyword with 800 monthly searches and only 40 competing titles? That's where you win.

Specificity wins. "Cookbook" is a keyword, technically. But "air fryer cookbook for beginners" is a keyword that converts. Longer, more specific phrases (long-tail keywords) signal higher purchase intent. Someone searching "book" is browsing. Someone searching "dark academia enemies to lovers slow burn" knows exactly what they want and they're ready to buy.

How to Pick Your Final Seven Keywords

Once you have your shortlist, here's the process I use:

1. Eliminate anything that doesn't genuinely describe your book. Be honest with yourself here.
2. Sort the remaining keywords by the ratio of search volume to competition. High volume, low competition is the dream.
3. Check for overlap. If two keywords share most of the same words, pick the stronger one. Amazon's algorithm is smart enough to parse partial matches, so you don't need "cozy mystery cat" and "cat cozy mystery" as separate entries.
4. Include at least one or two broad category terms alongside your long-tail picks. This gives you a mix of discoverability and targeted traffic.
5. Fill all seven slots. Every empty slot is wasted opportunity.

Don't stuff keywords into your title or subtitle awkwardly just for SEO. Amazon's guidelines are clear on this, and a spammy title turns off real readers. Your seven backend keyword slots exist specifically for this purpose. Use them.

When to Revisit Your Keywords

Keyword research isn't a one-time task. Markets shift. New competitors show up. Seasonal trends spike and fade. I recommend checking your keywords every 60 to 90 days, especially if your sales have plateaued or dropped without an obvious explanation.

If a book launched six months ago and never gained traction, your first troubleshooting step should be keywords. Not a new cover. Not a price change. Keywords. They're the cheapest, fastest lever you can pull.

Also revisit your research before any promotional push. If you're about to run ads or a price promotion, make sure your keywords still reflect what people are actually searching for right now, not what they searched for when you published.

Common Mistakes to Avoid

Copying a bestseller's keywords exactly. If a book with 5,000 reviews dominates a keyword, you're not going to outrank it as a new title. Find adjacent terms where you have a real shot.

Using author names or trademarked terms. Amazon can suppress your book for this. Don't put "like Colleen Hoover" in your keywords. It's against the rules and it's not a good strategy anyway.

Ignoring the data. Gut feelings are useful for writing books. They're terrible for keyword selection. If the numbers say your favorite keyword has zero search volume, believe the numbers.

Treating all seven slots the same. Mix it up. One broad genre term, a couple of trope-specific phrases, a comp-style descriptor, and a couple of niche long-tail terms. Diversification gives your book more ways to be found.