What does “indexed” mean on Amazon?
Keyword indexing means Amazon has linked a product to a keyword, so the product can appear in the results when a shopper searches it. Being indexed is not the same as ranking well: an indexed product can still sit on page ten.
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1.How sellers check it
Amazon doesn’t publish how indexing works. A common test is to search Amazon for your ASIN together with the keyword: if your product shows up, it is indexed for that word.
2.The byte limit that blocks it
The backend Search Terms field has a byte limit: under 250 bytes in most Amazon stores, under 200 in India and under 500 in Japan. Amazon’s 2017 notice says the “whole entry will be rejected upon exceeding limit”, so a field one byte too long can leave all its words unindexed.
Count bytes, not characters: letters like ä or é take 2 bytes, and most Japanese characters take 3.