How to Optimize Amazon Listings for Search

How Amazon's A9/A10 algorithm works

Amazon's search algorithm (commonly referred to as A9, or A10 in discussions about its updated version) has one overriding goal: show buyers the products they're most likely to purchase. Not the most popular products. Not the best-reviewed products. The products each buyer is most likely to buy right now given the context of their search.

This goal shapes everything about how the algorithm works. It indexes your listing for query relevance (can this listing match this search?), then it ranks relevant listings based on conversion likelihood (among listings that match this query, which ones convert at the highest rate for this type of buyer?).

The two factors that matter most

Keyword relevance: Amazon matches your listing to search queries based on the keywords in your title, bullet points, description, backend search terms, and product attributes. If the keyword isn't anywhere in your listing, your product doesn't appear for that query. Period. This is why keyword research and placement are foundational.

Sales velocity and conversion rate: Amazon's algorithm heavily weights sales performance. A listing that consistently converts at a high rate for a given query rises in rankings for that query. A listing with perfect keywords but no sales history is outranked by a listing with slightly worse keywords but a proven conversion track record. This is the virtuous cycle that makes new Amazon listings hard: you need sales to rank, but you need ranking to get sales. Advertising (Sponsored Products) is how most sellers break into this cycle.

What Amazon doesn't tell you

Amazon doesn't publish its ranking factors in detail. The specifics of A9/A10 are extrapolated from seller experience and Amazon's own statements about its marketplace goals. The constants are: keyword coverage in your listing, conversion rate, sales velocity, and customer satisfaction signals (reviews, return rate, A-to-Z claims). Price competitiveness and Prime availability (FBA) also influence Buy Box winning, which affects overall sales.

Keyword research for Amazon

Amazon keyword research is different from Google keyword research. Amazon buyers have higher purchase intent (they're on a shopping site, not a search engine), and the queries tend to be more product-specific. "Best kitchen knife" on Google is research. "Kitchen chef's knife 8 inch German steel" on Amazon is shopping.

Amazon's search bar: the fastest free tool

Type your product's main keyword into Amazon's search bar and observe the autocomplete suggestions. These suggestions are based on actual Amazon search data. Every autocomplete phrase is a real query real buyers have searched for. Your keyword list should include every relevant autocomplete suggestion for your product's core terms.

Competitor ASINs as keyword sources

Look at the listings of your top-performing competitors (the ones on page one for your target queries). What words do they use in their titles? What phrases appear in their bullet points? This isn't about copying; it's about identifying the vocabulary buyers and successful sellers use for products in your category. If three of the top five listings use a specific phrase, it's probably an important search term.

Keyword tools

Third-party tools like Helium 10, Jungle Scout, and SellerApp provide search volume data for Amazon keywords. They're useful for prioritizing: when you have 50 potential keywords, knowing which 10 have the highest search volume helps you decide what to put in your title (limited space, highest-impact terms) vs. backend search terms (more space, can accommodate longer tail). Many have free tiers with limited monthly searches.

Prioritizing by purchase intent

Not all keywords with high search volume are worth targeting. "Knife" has enormous search volume and near-zero conversion value if you're selling a specific chef's knife, because buyers searching "knife" are not in the same mindset as buyers searching "8 inch German steel chef knife." Focus on keywords where buyer intent aligns with your specific product. Higher intent keywords convert better, which improves your sales velocity, which improves your organic ranking.

Writing a title that converts

Amazon titles can be up to 200 characters for most categories, but Amazon's style guidelines and category-specific rules vary. The practical optimum for most categories is 150-170 characters: long enough to include your primary and secondary keywords, short enough to read without trailing off in search results.

Amazon's title formula

Amazon's style guide suggests a general structure: Brand + Product Name + Key Features. For many sellers, a more keyword-forward structure performs better: Primary Keyword Phrase + Brand + Key Differentiators. The right structure depends on whether your brand name is a significant driver of conversions (well-known brands should lead with brand) or if buyers are primarily searching by product type (most small sellers).

The strong version includes specific attributes (8 inch, German high carbon steel), use cases (professional kitchen, home cook), and benefit keywords (sharp blade, ergonomic handle). Each of these phrases could be a standalone search query. The weak version has brand and a vague category term but captures almost no long-tail search traffic.

Category-specific title rules

Amazon enforces category-specific title requirements in some categories (especially food, health, and electronics). Titles that don't follow the format can be suppressed from search. Check Amazon's Browse Tree Guide or your category's style guide in Seller Central before finalizing title structure. Violating title guidelines is a common reason listings get unexpectedly suppressed.

Bullet points: the conversion engine

Bullet points (listed as "Key product features" in Seller Central) are your listing's primary conversion tool. They appear prominently on the product detail page, below the title and to the right of the main image. Most buyers read bullet points before the description. They also contain indexable keywords, making them doubly important for both SEO and conversion.

The five-bullet structure

Amazon allows up to five bullet points for most categories. Use all five. Each bullet should lead with a benefit, then support it with a specific feature. "PROFESSIONAL GRADE STEEL - The blade is forged from X50CrMoV15 German stainless steel, rated at 58+ on the Rockwell hardness scale, for an edge that holds sharpness through hundreds of uses without honing."

The benefit (professional grade steel) earns the read. The feature (specific steel alloy + hardness rating) justifies the benefit claim. Both contain keywords.

What to put in each bullet

• Bullet 1: Your main value proposition. The primary reason a buyer should choose your product over alternatives. Lead with your strongest differentiator.
• Bullet 2: Key material or technical specs. The details that justify your price and distinguish your product from cheaper alternatives.
• Bullet 3: Use case and compatibility. Who is this for, what situations is it designed for, what won't it work for?
• Bullet 4: Dimensions, sizes, or practical specifics. Reduces returns by setting clear expectations before purchase.
• Bullet 5: Trust signals and guarantees. Warranty, satisfaction guarantee, customer service commitment. Reduces purchase hesitation.

Keyword placement in bullets

Include your secondary and long-tail keywords naturally throughout your bullet points. You don't need to force them; if you're writing specific, accurate bullets about a real product, the relevant keywords tend to appear organically. The all-caps bullet lead (a common Amazon convention) is also indexed, so make it keyword-rich.

Backend search terms

Backend search terms are keywords you enter in Seller Central that are invisible to buyers but indexed by Amazon's search engine. They're your opportunity to add keyword coverage without cluttering your buyer-facing content with awkward phrases.

How much space do you have?

Amazon allows 250 bytes (roughly 250 characters) for backend search terms across all fields. That's not a lot. Use this space efficiently.

What belongs in backend search terms

Use backend search terms for: alternate spellings and common misspellings ("organisation" vs "organization"), synonyms not in your title or bullets, abbreviations, Spanish or other language translations relevant to your market, and long-tail phrases that are too niche for your title but still searched.

Do not repeat keywords already in your title, bullets, or description in backend search terms. They're already indexed. Repeating them wastes your 250-byte allowance.

Backend search term rules

Amazon's backend search terms have specific guidelines: no competitor brand names, no ASINs, no offensive terms, no irrelevant terms. Violating these rules can trigger search suppression. Keep your backend terms strictly relevant to your actual product and buyer queries.

A+ Content and Brand Store

A+ Content (formerly Enhanced Brand Content) is available to sellers enrolled in Amazon Brand Registry. It replaces the standard text description with a module-based layout that can include high-resolution images, comparison tables, feature callouts, and narrative brand content. Studies by Amazon show A+ Content can increase conversion rates by 3-10% on average.

What A+ Content does for SEO

The text in A+ Content modules is indexed by Amazon's search engine, giving you additional keyword capacity beyond your title and bullets. More importantly, A+ Content improves your conversion rate, and a higher conversion rate improves your organic search ranking. The SEO benefit of A+ Content is mostly indirect, through conversion, rather than through keyword expansion.

Best practices for A+ Content

Use A+ Content to tell your brand story, show the product in use, compare your product line (which is great for cross-selling), and address the common objections or questions you see in reviews or Q&A. High-quality lifestyle photography in A+ Content significantly outperforms product-on-white photography for conversion on most product categories.

Brand Store

A Brand Store is a multi-page branded destination within Amazon. It doesn't directly affect individual listing rankings, but it's indexed by both Amazon and Google, and Sponsored Brand ads can link to your Brand Store. For brands expanding to Amazon from Shopify, the Brand Store is the closest thing to a branded experience within Amazon's interface. If you manage listings on Amazon alongside other marketplaces, our guide to managing listings across platforms covers how to keep everything coordinated.