Amazon Keyword Research: Where Keywords Come From, How to Choose Them, Where They Go (Title, Bullets, Search Terms, Backend), and the Tools Worth Paying For

Amazon keyword research means finding the words shoppers actually type when they are ready to buy, not just browse, which is the difference from Google keyword research. Keywords come from three places: Amazon's own data, publicly visible sources such as autocomplete and competitor listings, and paid tools. This guide covers where to find them, how to choose and prioritise them, where each one goes in a listing (including the hidden backend fields and their limits), what platinum keywords were, and the tools worth paying for.

How Amazon search uses keywords

Amazon indexes keywords from the title, bullets, description and the hidden backend fields, and matches them against what a shopper types with a mix of exact and broader matching depending on the term. The visible fields do two jobs at once, being found and persuading; the backend fields only do the first, giving the search engine extra context about what the product is, who it is for and when it is used, so the listing surfaces for queries the visible copy does not cover.

Getting the right keywords in is the relevance half of ranking. The other half, whether the listing converts once found, is a separate question; Amazon listing optimization covers the full picture.

Where keywords come from: the four sources

Amazon's own data. Brand Analytics (Brand Registry required) has the Search Terms report, which shows the terms shoppers actually search and which products they click and buy, the closest thing to ground truth available, and Search Query Performance, which shows how a specific ASIN performs against a given query. The advertising search-term report, available to any seller running Sponsored Products with or without Brand Registry, shows which real queries triggered a click or sale on an ad, a useful proxy when Brand Analytics is out of reach. Seller Central's category flat file also carries keyword suggestions: download the Advanced template for your category from Add Products via Upload and look at the Discovery column on the Valid Values tab. It is limited, but free.

Autocomplete. Typing a partial term into Amazon's own search bar surfaces its most common completions, a free, always-current signal of real search behaviour.

Competitor listings. The titles and bullets of the top-ranking listings in your category show which terms are already proven to work.

Tools. Third-party keyword tools aggregate and estimate volume across these sources at scale, and reverse-ASIN lookups show the terms a competitor's listing ranks for; they are compared below. Keyword research and product research are different jobs with different tools: Amazon product research tools covers what to sell, and Amazon ACoS covers keywords chosen for advertising and what they cost.

Choosing keywords: relevance, volume and intent

1. Build a seed list from your own knowledge of the product, its use cases, and how a customer would describe it in their own words.

2. Expand the list using the four sources: Brand Analytics or the ad search-term report if you have them, autocomplete, and competitor listings.

3. Cut anything irrelevant. A high-volume term that does not describe your product wastes space and hurts conversion by attracting the wrong click.

4. Group the remaining terms by intent: some describe the product itself, some a use case, some who it is for.

5. Prioritise by volume against competition. A lower-volume term you can realistically win often beats a high-volume term buried under established competitors.

6. Assign each priority keyword a place in the listing: the title for the highest-priority terms, bullets for the next tier, the backend fields for anything that does not fit naturally into visible copy.

Worked example: a seller of a stainless steel water bottle seeds with "water bottle", "stainless steel bottle" and "insulated bottle", expands into use-case terms ("gym water bottle", "hiking water bottle") and audience terms ("kids water bottle", "water bottle for men") from autocomplete and competitor titles, then prioritises the use-case terms that have real volume and are not already owned by an established top seller.

Amazon search terms: the field and the report

"Search terms" means two different things. First, it is one of the backend keyword fields in Seller Central, where hidden terms live (next section). Second, it is the advertising search-term report, which shows the actual queries shoppers typed that led to a click or sale on a Sponsored Products campaign. That report is a research source in its own right: the terms that convert in ads are terms worth carrying into the listing, and the terms that spend without converting are ones to keep out.

Backend keywords: limits and rules

The backend keyword fields are hidden from shoppers but indexed by Amazon's search. You reach them in Seller Central under Manage Inventory: edit the SKU and open the Keywords tab. There are five active fields, each with a purpose:

The rules that apply, in the search terms field above all: stay within the byte limit (249 bytes for search terms is the figure Amazon has published; note that bytes are not characters, and Japanese or Chinese characters can take three or more bytes each); separate keywords with spaces only, never commas; do not repeat terms already used in the title or bullets; never include a competitor's brand name or your own, or ASINs; skip stop words; and avoid subjective or temporary language ("amazing", "today", "limited edition", "popular"), which Amazon treats as a violation in this field. Abusive terms are prohibited outright.

Do: use synonyms, abbreviations, spelling variants and the terms real customers use. Do: use the space you have; unused bytes are wasted. Do not: repeat visible keywords, use commas, brand names, ASINs or subjective claims.

Platinum keywords: what they were and what to do now

Platinum keywords were a backend field originally for Platinum-tier merchants to establish parent-child relationships between product variations. The field has been discontinued and is no longer indexed, so anything entered there has no effect on ranking or visibility.

If you are here because you saw an empty Platinum Keywords field in your listing editor: leave it empty. Put that effort into the Search Terms and Subject Matter fields, or into setting up variations through Amazon's current variation-listing process rather than this legacy field.

The best Amazon keyword tools compared

Prices change without notice; check each tool's pricing page before you buy. "Amazon SEO tools" is sometimes used as a broader label covering keyword tools, listing optimisation tools and rank trackers together; Amazon listing optimization covers that fuller category, and Amazon FBA software covers the wider seller-tool stack.

Tracking keyword rankings and refreshing the list

Track your priority keywords' search-result position at least monthly, and more often around a launch or a major listing change. A term that has sat outside the first page or two for months despite real relevance is a candidate to deprioritise in favour of something more winnable. Keyword research is ongoing, not a one-time task: shoppers' language shifts, and so should the list. The traffic those keywords bring is what feeds Amazon Best Sellers Rank, which is where the results show up.

Keywords and the support inbox

The words buyers use in support messages, reviews and seller feedback are free keyword research: they describe the product and their use case in their own language, not a guess at what they might search. Mining recurring phrases from tickets and reviews can surface a keyword gap, and answering pre-sales questions in the words buyers search with reinforces relevance rather than fighting it. See Amazon helpdesk software for how eDesk keeps Amazon messages and reviews in one place where those phrases are easy to see.

FAQ

How do I do keyword research for Amazon?

Build a seed list, expand it using Amazon's own data (Brand Analytics or the ad search-term report), autocomplete and competitor listings, then prioritise by relevance and volume against realistic competition.

What are Amazon backend keywords?

Hidden fields in Seller Central's listing editor, indexed by Amazon's search but never shown to shoppers, used for terms that do not fit naturally into the visible title, bullets or description.

What is the backend keyword limit on Amazon?

249 bytes for the search terms field. Bytes are not characters; accented, Japanese and Chinese characters take more than one byte each.

What are platinum keywords on Amazon?

A discontinued backend field, no longer indexed by Amazon's search. Anything entered there has no effect; leave it empty.

What is the best Amazon keyword tool?

It depends on budget and need. Amazon's own Brand Analytics is the most authoritative source for brand-registered sellers; free tools such as Sonar cover the basics; paid suites such as Helium 10 add tracking and broader research features.

How do I check my Amazon keyword ranking?

Search the term on Amazon and note your listing's position, or use the rank-tracking feature inside a research tool to monitor many terms automatically over time.

Once your keywords are working, make sure the questions they generate get answered fast

See Amazon helpdesk software for how eDesk connects to Amazon.