Paste your backend keywords to count bytes against your marketplace's limit, see exactly which words fall past it, and strip duplicates, commas and words your title already covers.
Amazon.com and most marketplaces: under 250 bytes (249 max).
0 / 249 bytes
0 characters · 0 words · 249 left
Counted in UTF-8 bytes, the way Amazon measures this field. Spaces count as 1 byte each.
Runs entirely in your browser. Your keywords are never sent anywhere or stored.
zonfy's Listing Generator writes your title, bullets, description and backend search terms from one product link, ready for Seller Central. Paid plans from ₹749/month.
How to use it
Copy the Search Terms (generic keywords) field from Seller Central or your flat file. Optionally paste your title and bullets too, so the tool can spot words you're paying for twice.
Choose US/UK/EU (under 250 bytes), India, Japan or a custom limit. The bar shows your byte count, and any words past the limit are highlighted.
Review the flags, then press Clean up for a lowercase, comma-free, deduplicated version trimmed to the limit. Copy it back into Seller Central.
Backend search terms are the hidden keywords in your listing's Search Terms (generic keywords) field. Shoppers never see them, but Amazon indexes them so your product can show up for searches your title and bullets don't cover. On Amazon.com and most marketplaces the field must stay under 250 bytes. Amazon.in has historically been reported at a lower limit of around 200 bytes and Amazon.co.jp at around 500, so always confirm the figure shown next to the field in your Seller Central.
The limit is in bytes, not characters. Plain English letters, numbers and spaces cost one byte each, but accented letters cost two and Devanagari and most other Indian scripts cost about three bytes per character, so a Hindi-script keyword uses roughly three times the space of the same number of English letters. Amazon has said that search terms over the limit may not be indexed at all, so a single extra word can cost you more than that word.
Because the space is small, waste matters. You don't need commas, repeated words, misspellings, or plural and capitalisation variants, and any word already in your title or bullets is indexed anyway. Brand names you don't own, ASINs, and temporary, promotional or offensive terms aren't allowed. This checker flags all of that as you type and builds a cleaned-up version for you. Everything runs in your browser; nothing is sent or stored.
On Amazon.com and most marketplaces the field must stay under 250 bytes, so 249 bytes is the safe maximum. Amazon.in has historically been reported at around 200 bytes and Amazon.co.jp at around 500. Check the guidance next to the field in your Seller Central or in your category's upload template.
Bytes. For plain English text one character is one byte, including spaces. Accented letters use two bytes, and Devanagari and most Indian scripts use about three bytes per character, which is why this tool counts UTF-8 bytes rather than characters.
Amazon has said that search terms over the limit may not be indexed at all, rather than simply being cut at the limit. This tool highlights the words that fall past your limit so you can trim them before you upload.
No. Separate words with single spaces. Commas and other punctuation only use up bytes, and word order and repetition don't matter for indexing. The Clean up button removes them for you.
No. Amazon combines the indexable words from your title, bullets and backend terms, so repeating a word that is already in your title or bullets uses bytes without adding anything. Paste your title and bullets into the optional box and the tool will flag those words.
No. Amazon prohibits brand names you don't own, ASINs, and temporary, subjective or promotional terms such as "best", "sale" or "new" in search terms. The checker gives a hint when it sees capitalised words that might be brand names, ASIN-like codes and common promotional words.
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