Backend keywords are Amazon's hidden search field — invisible to shoppers but indexed by Amazon's search algorithm. Used properly, they expand the range of searches your product appears for without cluttering your visible listing.
Where to Find Backend Keywords
In Seller Central, go to your inventory, click "Edit" on any listing, and navigate to the "Keywords" or "Search Terms" tab. You will see a field called "Search Terms" (sometimes called "Generic Keywords"). This is where your backend keywords go.
You have a limit of 250 bytes (roughly 250 characters for English text) for your search terms. This is not a lot of space, so you need to use it wisely.
What to Put in Backend Keywords
Use this space for relevant search terms that do not fit naturally in your title, bullet points, or description. Think about synonyms (if your title says "water bottle," your backend might include "flask," "drinks container," "hydration bottle"), alternate spellings (colour/color, grey/gray), related terms shoppers might use, and long-tail variations.
Include common misspellings if they are genuinely frequent — some shoppers search for "stationary" instead of "stationery," for example.
Formatting Rules
Separate words with spaces, not commas or semicolons. Amazon ignores punctuation in search terms, and commas actually waste your character limit. Do not repeat words that already appear in your title, bullet points, or brand name — Amazon already indexes those. Use lowercase throughout (capitalisation does not matter for search).
Do not use ASINs or brand names of competing products — this violates Amazon's terms of service and can result in listing suppression or account warnings.
Common Mistakes
The biggest mistake is repeating keywords from your title. If "stainless steel water bottle" is in your title, putting it in your backend keywords is a waste of space — Amazon already indexes it. Use that space for new terms instead.
Another common error is including subjective or promotional language ("best," "cheapest," "amazing deal"). These are not terms Amazon indexes productively and waste your limited character count.
Some sellers cram in irrelevant high-volume keywords hoping to appear in popular searches. This does not work — even if your product briefly appears in an irrelevant search, shoppers will not click on it, which tells Amazon it is not relevant, potentially hurting your ranking.
Keyword Research for Backend Terms
Start with your main keyword research (the terms in your title and bullets), then look for related terms you have not used. Amazon's search bar autocomplete is useful — start typing your main keyword and see what suggestions appear. Tools like Helium 10 and Jungle Scout can show you related searches and competitor keywords.
Customer reviews (both yours and competitors') often contain the language real shoppers use to describe products. Mining these for natural search terms can reveal keywords you would not have thought of.
Updating Backend Keywords
Backend keywords are not permanent. Review them periodically — at least every quarter. If you notice new search terms trending in your category, add them. If seasonal terms are relevant (like "Christmas gift" in Q4), you can temporarily update your backend keywords to capture that traffic.
The changes take effect quickly — usually within 24 hours — so seasonal updates are practical and worthwhile.
Do Backend Keywords Really Matter?
For products in competitive categories, every bit of search visibility helps. Backend keywords expand your search footprint without affecting your listing's readability. They are particularly valuable for capturing long-tail searches — specific, lower-volume queries that collectively represent significant traffic and often convert at higher rates than broad searches.
Think of backend keywords as free, hidden advertising space. It takes minutes to optimise, costs nothing, and can incrementally improve your search visibility. There is no reason not to use them well.