KDP gives every book seven backend keyword boxes that readers never see but Amazon search uses. The 7 Backend Keywords Tool fills them for you: describe your book — title, category, audience and a short summary — and it writes seven keyword phrases sized to the 50-character guide for each box.
You can also start from a competitor: enter the ASIN of a similar book on Amazon.com, .co.uk, .de, .fr, .es, .it or .ca and the tool reads that listing to inform your keywords. Each box shows its character count, and the set can be copied in one go or exported.
Needs a free account and uses credits. The cost is shown on the page before you run anything, and current credit packs are on the pricing page. See pricing
KDP gives each book seven keyword boxes. Each holds a word or short phrase; the tool sizes each one to a 50-character guide and shows the count.
It reads the public Amazon listing of the book you enter, in the marketplace you choose, and uses it to inform the keywords for your own book. It does not see that book’s private backend keywords.
Generating keywords and analysing an ASIN each need a free account and use credits; the cost of each is shown on the page before you run it.