What are Amazon backend search terms?
The Search Terms field, also called backend keywords, is a field in Seller Central for words that help Amazon match your product to searches. Shoppers never see it on the product page.
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1.The limit
Amazon’s 2017 notice sets the limit at “less than 200 bytes in India, 500 bytes in Japan and 250 bytes in every other marketplace except China”, and says the whole entry is rejected if it goes over. So 249 bytes is the most you can use in most stores.
The notice also says spaces and punctuation don’t count toward the limit, and that words should be separated by spaces.
2.What goes in, and what stays out
Amazon’s staff tips say to use it for synonyms, abbreviations, other names and spelling variations. Leave out words already in your title, repeats, filler words like “a” and “the”, brand names and ASINs. Amazon’s guidance also bans temporary and subjective claims such as “new” or “best”.