Backend search terms (formerly "search terms" or "keywords" field) are hidden keywords Amazon indexes but never displays to shoppers. They work alongside your title, bullets, and description to decide which search queries your listing appears for. For cross-border sellers, they are the cheapest ranking lever you own — they cost nothing and require no PPC spend.
Amazon indexes a maximum of 250 bytes across the whole field — roughly 250 ASCII characters, or fewer when you use accented characters (each accented letter counts as 2 bytes). Every byte beyond 250 is simply ignored, so a bloated field silently wastes indexing potential.
Amazon indexes individual words, not phrases, and it matches on synonyms (e.g., "soda" and "pop") and on misspellings when Amazon's synonym engine recognizes them. Practical takeaway: prioritize single high-volume words plus obvious misspellings of your main keywords, and stop obsessing over exact phrase ordering — it does not matter for ranking.
1) Export your product's search-term report from Seller Central (Brand Analytics or Advertising reports). 2) Pull the top 30 search queries for your category from a keyword tool. 3) Remove any word already covered by your title/bullets. 4) Remove brand names, competitor names, and anything seasonal you do not actually sell. 5) Fill the remaining 250 bytes with the highest-volume uncovered words, space-separated. 6) Re-check every 4–6 weeks — search demand shifts.
Listing every product attribute instead of focusing on search demand; keyword-stuffing synonyms of the same word; using "best", "cheap", or "free" (Amazon blocks these in some marketplaces); and forgetting that backend terms do nothing for ranking — only for indexing. Rank comes from conversion, so pair backend work with a strong front-end listing.
Backend terms amplify a good listing; they cannot rescue a weak one. Generate a conversion-optimized title, bullets, and description in 30 seconds with our free AI tool, then layer your backend keywords on top.