Amazon Backend Keywords Checker
Free · no accountStop wasting your 249 backend bytes.
A free Amazon backend keywords checker: paste your search terms (generic keywords) with your title and bullets and see which bytes you're wasting.
Paste your backend terms, plus your title and bullets to catch repeats, then press Check my terms. It runs in your browser; nothing is sent anywhere.
Runs in your browser · Free, no account · AI policy scan and keyword suggestions on Pro
What it catches
Over the limit
Amazon can ignore the whole field when it's over 249 bytes, not just the extra.
Repeats
Words already indexed from your title and bullets earn nothing twice.
Risky terms
Brand names, ASINs and subjective claims that can get the listing flagged.
More on our Amazon search terms tool: what to put in the field, and how the rewriter fills it.
Backend search terms questions
What are backend search terms?
A hidden field in Seller Central where you can add extra keywords that don't fit naturally in your title, bullets, or description. Amazon indexes them for search but never shows them to shoppers.
What should I actually put in there?
Search terms you want to rank for but can't fit into your visible copy: synonyms shoppers use instead of your wording (earphones vs earbuds), common misspellings, foreign-language terms for your marketplace, and use-cases like gym or travel. What doesn't belong is anything already in your title or bullets. Amazon indexed those the moment you published, so repeating them there buys you nothing and burns bytes you only get 249 of.
Why does the byte limit matter?
Amazon allows 249 bytes of backend search terms, counted in bytes rather than characters. Accented letters and some symbols take more than one byte each, so a field can look short and still be over. Go over and Amazon can ignore the whole field, not just the extra words.
Why avoid repeating words from my title or bullets?
Amazon already indexes the words in your visible copy. Repeating them in your backend terms wastes bytes you could spend on synonyms, misspellings, or translated terms shoppers actually search instead.
Do I need an account?
No. The checker is free and works without an account or sign-up. On Pro and Agency it also suggests backend keywords ranked by real Amazon search volume.
Is this connected to the SEO Audit?
It's the one thing the main audit can't check on its own. Amazon doesn't expose a listing's backend terms publicly, so there's no way to score them from a live page. This tool fills that gap using what you paste in directly. It also runs automatically on anything the AI Copy Rewriter generates for you.