Amazon Keyword Research: A Beginner's Guide (2026)

Short version: Amazon keyword research means finding the words shoppers search and the intent behind them. Keywords still get you indexed by A9/A10, but COSMO now ranks by how well you match the need. This guide covers free ways to find keywords, how to group them, and where to place them under the new 75-character title limit.

Keyword research is the foundation of every other listing optimization you'll do — you can't write a title, bullet, or backend field well without knowing what shoppers actually search. The good news: you can do solid keyword research for free. This is the beginner-friendly, step-by-step version, updated for how Amazon search works in 2026.

What counts as an Amazon keyword?

An Amazon keyword is any word or phrase a shopper might type into Amazon's search bar that you want your listing to match — not just your product's official name. That includes brand terms, the product type itself ("travel mug," not just a SKU name), attributes like size, color, or material, use cases ("for hiking," "for the office"), and the synonyms shoppers use instead of your own terminology ("tumbler" for "travel mug").

Amazon indexes keywords from five places in a listing: the title (75 characters, your single most important placement), bullet points (five lines for secondary terms worked into real sentences), the product description, Item Highlights (the ~125-character field Amazon added alongside the shorter title), and the hidden Search Terms field in Seller Central (more on that field just below). For a field-by-field map of which keyword goes where, see where to put keywords in an Amazon listing.

Three practices apply wherever you place a keyword: write the way shoppers actually search rather than your internal product name, put each keyword in one field instead of repeating it everywhere, and weigh relevance over raw search volume — a high-volume term you barely match wastes a slot.

Amazon search terms: what the field is, the limit, and an example

Amazon search terms — also called "backend keywords" or the Generic Keyword field — are a hidden field you fill in from Seller Central's Edit Product → Keywords tab. Shoppers never see it, but Amazon indexes it alongside your title and bullets. Use it for synonyms, spelling variants, abbreviations, and terms that don't fit anywhere visible.

The limit: Amazon staff state the length limit for generic keywords is 249 bytes, measured in bytes, not characters. Check your own count with our free Amazon search terms byte counter.

Two rules Amazon states: don't repeat words already in your title, bullets, or description, and write in lowercase. A word placed in the title is already indexed, so repeating it in the field spends bytes for nothing.

Worked example. Say the title is "Acme Insulated Travel Mug 20 oz, Stainless Steel." Words like "travel," "mug," and "insulated" are already covered. The Search Terms field takes what the listing doesn't say:

tumbler commuter coffee cup thermos leakproof road trip hiking hot drink

That is 62 bytes (Amazon does not count spaces) of synonyms ("tumbler," "thermos"), use cases ("commuter," "hiking"), and shopper phrasing ("road trip"), with no word repeated from the title. It leaves room under the limit for more variants. For a fill-in template and the full do's and don'ts, see our guide to Amazon backend search terms.

What Amazon keyword research is (and what changed)

Traditionally, keyword research was about collecting the exact phrases shoppers type so you could match them. That still matters — Amazon's A9/A10 engine uses keywords to index your product and decide which searches you're eligible to appear in.

What's new is the COSMO layer: Amazon's AI now reads the intent behind a search. Someone searching "something to keep coffee hot on a commute" should find your travel mug even if that exact phrase isn't in your listing. So modern keyword research is two jobs: collect the literal terms, and understand the problems and scenarios behind them.

How to find keywords — for free

You don't need a paid tool to start. Five free sources:

• Amazon search autocomplete. Start typing your product type in the Amazon search bar and note every suggestion — these are real, popular queries.
• Your reviews and Q&A. The exact words customers use to describe and ask about your product are gold — and they map directly to how people search.
• Competitor listings. Read the top competitors' titles and bullets, then type the buying questions you're researching into their "Looking for specific info?" box and expand the related Q&A results for phrasing you're missing.
• Google autocomplete & "People also ask." Great for the question-style, intent-rich phrases COSMO and Alexa for Shopping reward.
• Brand Analytics (Brand Registered). Amazon's own search-term reports show real query data for your category, including the Search Query Performance report, which breaks that data down query by query for your own products.

Paid tools (Helium 10, Jungle Scout, Ahrefs) add search-volume and difficulty numbers, which help you prioritize — but they're an optimization, not a prerequisite. For a source-by-source comparison of what each free option returns, see the best free Amazon keyword research tools.

Competitor listings deserve one more pass beyond just reading them: a reverse ASIN lookup flips the process around, starting from a competitor's ASIN and returning the terms that listing already wins clicks on — a faster way to confirm which of your competitor phrasing guesses are actually working for them.

Group your keywords: three buckets + intent

Once you have a list, organize it so you know what to do with each term:

• Primary — the single phrase you most want to rank for. This one earns a spot in your 75-character title.
• Secondary — closely related terms for bullets, Item Highlights, and A+ content.
• Long-tail — specific, lower-competition phrases, often question-shaped, for Q&A and backend terms.

Then add an intent note to each cluster: what problem is the shopper solving? That's what COSMO matches on.

A step-by-step keyword research process

1. Brainstorm seed terms. How you'd describe the product, then how a shopper who doesn't know your brand would.
2. Expand with autocomplete. Feed each seed into Amazon and Google autocomplete; collect suggestions.
3. Mine reviews, Q&A, and competitors for real language and gaps.
4. Cluster into primary / secondary / long-tail and tag each with the shopper intent.
5. Prioritize. If you have volume data, sort by volume vs. relevance; if not, lead with the terms most specific to your product.
6. Map to fields (next section) and write.

Where keywords go now (with the 75-character title limit)

Since July 27, 2026, Amazon caps titles at 75 characters (all categories except media). That changes placement — but you don't lose coverage, you redistribute it, because every field is still indexed:

• Title (75 chars): brand + primary keyword + most important attribute only.
• Item Highlights (~125 chars): secondary keywords and use cases that used to bloat the title.
• Bullets: secondary keywords worked in naturally, one theme per bullet.
• Backend search terms: synonyms, variants, and misspellings not used elsewhere.
• A+ Content & Q&A: long-tail, question-style phrases.

See our guides on title optimization and backend keywords for the field-by-field detail.

Common keyword research mistakes

1. Chasing volume over relevance. A high-volume term you barely match wastes a slot and confuses COSMO.
2. Ignoring intent. Collecting words without asking "what problem is this?" misses how modern search ranks.
3. Stuffing. Repeating keywords doesn't help; Amazon indexes each once, and stuffing hurts clarity.
4. Never revisiting. Search language shifts seasonally — refresh quarterly.

Keyword research checklist

• ☐ Seed list built from your words + a stranger's words
• ☐ Expanded with Amazon + Google autocomplete
• ☐ Reviews, Q&A, and competitors mined for real phrasing
• ☐ Clustered into primary / secondary / long-tail, each tagged with intent
• ☐ Mapped to fields (title 75 chars → Item Highlights → bullets → backend → A+/Q&A)
• ☐ Refresh scheduled quarterly

Next: turn this list into a listing with the full optimization guide, then track how those keywords rank once you've placed them.

Frequently asked questions

What is Amazon keyword research?

Finding the words and phrases shoppers use to search for products like yours, so you can include them where Amazon indexes your listing — and understanding the intent behind those searches, since Amazon's COSMO layer ranks by how well a product matches the need, not just the words.

How do I find Amazon keywords for free?

Use Amazon's search autocomplete, read your reviews and customer Q&A for the exact words buyers use, study competitor listings, and check Google autocomplete and related searches. Brand Registered sellers can also use Amazon's Brand Analytics search-term data.

Where do I put keywords now that Amazon titles are capped at 75 characters?

The title (75 chars, capped since July 27, 2026) holds only brand + primary keyword + most important attribute. Secondary keywords move into Item Highlights, bullets, A+ Content, and backend search terms. Every field is still indexed, so you redistribute coverage rather than lose it.

Do keywords still matter with the COSMO algorithm?

Yes. A9/A10 still uses keywords to index your product and build the candidate pool; COSMO then ranks those candidates by intent and context. Keywords still get you found, but stuffing no longer helps — clear, relevant language that matches shopper intent wins.

What counts as an Amazon keyword?

Any word or phrase a shopper might type into Amazon's search bar that you want your listing to match — brand terms, the product type, attributes like size or color, use cases, and the synonyms shoppers use instead of your own terminology. Amazon indexes them from the title, bullets, description, Item Highlights, and the hidden Search Terms field.

What is the Amazon search terms limit?

Amazon staff state the length limit for generic keywords (the Search Terms field) is 249 bytes. It is counted in bytes, not characters. Don't repeat words already in your title, bullets, or description. See our guide to Amazon backend search terms for a template, and use the byte counter to check your count.

What is the Amazon Search Terms field?

A hidden field in Seller Central (Edit Product → Keywords) where you add extra keywords Amazon indexes but never shows to shoppers. Use it only for synonyms, spelling variants, and terms that don't already appear elsewhere in your listing. The limit is 249 bytes — see the Amazon search terms limit answer above and our guide to Amazon backend search terms.