Best Free Amazon Keyword Research Tools (2026): What Each Free Option Gives You

Short version: No free source gives you keywords, relative demand, and your own conversion data at once. Autocomplete gives you real queries. Brand Analytics gives you ranked terms and your query funnel, but only with Brand Registry. Your Ads search term report gives you what already sold. Free tiers from paid tools give you ideas with caps. Use two or three together and cross-check the overlap.

Search "free Amazon keyword tool" and you get a page of tools that all want an email address. Some are useful. Most give you a short list and stop. This guide ranks the free options by what they actually return, and says where each one stops, so you can build a keyword list without paying before you know what you need.

Once the list exists, the next job is placement. That is covered in our Amazon keyword research guide. This article is about the sources.

The five free sources, compared

• Amazon search autocomplete. Cost: none. Returns: real, current queries that start with your seed. Stops at: no volume and no ranking data.
• Brand Analytics. Cost: no separate fee, but you need a Professional selling account ($39.99 per month plus selling fees, per Amazon) and Brand Registry. Returns: Top Search Terms across Amazon stores, with the top three products, categories, and brands per keyword, plus Search Query Performance with query volume, impressions, clicks, cart adds, and purchases for your own brand. Stops at: sellers without a registered brand.
• Your Sponsored Products search term report. Cost: Ads spend. Returns: the exact queries that triggered your ads, with clicks and orders. Stops at: terms you have already paid to test.
• Free tiers of paid tools. Cost: an account. Returns: seed-to-ideas expansion and a competitor-keyword view. Stops at: usage caps, which the vendors change.
• A reverse ASIN lookup. Cost: varies. Returns: the terms a competitor's listing already wins clicks on. Stops at: terms that listing happens to rank for, which may not fit your product.

1. Amazon autocomplete

Type your product type into the Amazon search bar and write down every suggestion. Then type the seed plus each letter of the alphabet ("travel mug a", "travel mug b") and write those down too. This is the cheapest way to see phrasing shoppers use today.

Autocomplete does not tell you which suggestion is big. Treat it as a candidate list, not a ranking.

2. Brand Analytics

Amazon lists two reports that matter here. Top Search Terms shows search activity across Amazon stores and, for each keyword, the top three products, categories, and brands. Search Query Performance lists the keywords customers use to find your brand, with query volume, impressions, clicks, cart adds, and purchases.

This is the only free source with Amazon's own demand data. The catch is eligibility: Amazon says you need a Professional selling account and must be a Brand Representative for a brand enrolled in Brand Registry. See Amazon search terms explained for how Brand Analytics terms differ from the Seller Central field and the ads report, and the Search Query Performance guide for reading the funnel columns.

3. Your own Ads search term report

If you run Sponsored Products, the search term report lists what shoppers typed before clicking or buying. The usual method: run an automatic campaign, then read the report. Look for terms with orders that you do not yet use in your title, bullets, or backend field.

The limit is survivorship. You only see terms you paid for. A high-intent phrase you never bid on, and never indexed for, will not appear.

4. Free tiers of paid tools

Helium 10 publishes a free Amazon Keyword Tool: enter a seed keyword or ASIN and it returns related search terms. Its free Chrome extension includes Xray for keyword and sales data. Helium 10's pricing page also says access to the Chrome extension is limited on the Free plan, while paid plans include full access. The pages we read state no usage numbers for the free tier.

That is the pattern with most free tiers: the vendor does not publish a stable cap, and the cap changes. Before you build a workflow on one, open the tool, run three searches, and see where it stops. Do not trust a blog post's number, including ours. We also cover what the paid versions add in Helium 10 alternatives and the Amazon SEO tools roundup.

5. Reverse ASIN

Start from a competitor that already ranks and ask which terms their listing earns clicks on. A reverse ASIN lookup is the fastest way to find gaps in your own list. The OptimalCentral Reverse ASIN tool does this from Amazon's market search-term data, with search frequency rank and click and conversion shares per term.

Which source for which job

A worked example: 40 candidates down to 12

Take an insulated travel mug with no Brand Registry yet.

1. Autocomplete on "insulated travel mug" plus the alphabet gives about 40 candidates.
2. A reverse ASIN lookup on the three best-selling competitors adds terms like "leak proof" and "fits cup holder" that autocomplete missed.
3. Cluster the combined list into one primary term, four to six secondary terms, and long-tail phrases.
4. Drop anything that does not describe your product. A high-volume term you barely match wastes a slot.
5. Place the primary term in the 75-character title and move the rest into bullets, Item Highlights, and the backend field.

Twelve well-placed terms beat forty scattered ones. Field-by-field placement is in the backend keywords guide and the title optimization guide.

What free lists do not tell you

• Where you rank today. A keyword list is not a position. Track the terms you picked with a keyword rank tracker.
• Whether the term pays. A term can rank and still cost you at 60% ACOS in ads. The OptimalCentral Keyword Hub puts organic position, Ads spend, and search funnel on one row per keyword and flags the collisions. It is included with every plan.
• Whether shoppers click. If a term shows impressions but few clicks, the fix is the main image and title, not more keywords.

Frequently asked questions

What is the best free Amazon keyword research tool?

No single free tool covers everything. Autocomplete shows real queries, Brand Analytics shows ranked search terms and your own query funnel, and your Ads search term report shows what shoppers typed before buying. Free tiers from third-party tools add ideas on top.

Is Amazon Brand Analytics free?

There is no separate fee, but it requires a Professional selling account ($39.99 per month plus selling fees, per Amazon) and enrollment as a Brand Representative in Amazon Brand Registry.

Can I do Amazon keyword research without Brand Registry?

Yes. Use autocomplete, competitor listings, reviews and Q&A, a reverse ASIN lookup, and your own search term report. Only Brand Analytics needs Brand Registry.

Do free keyword tools show real search volume?

Treat third-party volume numbers as estimates. Brand Analytics reports come from Amazon itself.

How many keywords should I collect?

Collect more than you need, then cut. A working set is one primary keyword, a handful of secondary terms, and a list of long-tail phrases. Only the primary goes in the 75-character title.