Amazon Backend Search Terms Generator

How the backend keywords generator works

Amazon’s generic keyword field, also called backend search terms, lets you add words shoppers search for that are not in your title or bullets. The US limit is less than 250 bytes, and Amazon may not index the field when it is over the limit. This tool cleans your list and fits it to that limit. It runs in your browser and works offline.

Cleaning steps

1. Lowercase every word and drop punctuation, because Amazon does not need commas or other separators.
2. Remove brand names you enter, ASINs, ISBNs and barcode numbers, which are not allowed.
3. Remove subjective or temporary claims such as best, amazing, new or sale.
4. Remove words already in your title and, if you choose, your bullets, since Amazon already indexes them.
5. Remove repeated words, singular or plural forms of words you already have, and stop words such as the, for and with.
6. Add the remaining words in your order until the byte limit is reached, and list the words that did not fit.

Counting bytes

Amazon counts bytes, not characters. Plain letters use one byte, while accented letters such as the e in cafe with an accent use two, so café is five bytes. Amazon says spaces and punctuation do not count. The tool shows both the raw byte count and that counted figure, and fits to the raw count by default for safety.

Limitations

The tool only reorganises words you supply. It does not suggest new keywords or show search volumes, because we never estimate numbers. Plural folding uses simple English rules. Some categories use other limits, so change the byte limit if needed. Default rates and limits checked November 2026. Fees and rules change, so confirm in your seller dashboard. Not affiliated with Etsy, Amazon, eBay or Walmart.