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Amazon backend keywords checker
Paste your Search Terms (generic keyword) field. We count bytes, remove repeats and punctuation, and give you a clean version to paste back.
0 / 249 bytes
How it is calculated
Limit is measured in bytes, not characters (most 2026 seller guides: 249 bytes in the US)Letters, numbers and spaces use 1 byte; accented letters and symbols use 2 or moreSeparate words with spaces; commas and punctuation waste bytesDo not repeat words already in your title or in the field
Backend search terms are indexed but hidden from shoppers, and with 2026's shorter titles they carry more of your keyword coverage. Going over the byte limit risks the field not being indexed at all, so the byte count matters more than the character count.
Check the limit shown in your own listing editor, since Amazon can set different limits by marketplace and category.
Questions about the backend keywords checker
What is the Amazon backend keyword limit?
Most 2026 seller guides put the US Search Terms limit at 249 bytes. It is measured in bytes, so accented letters and symbols use more than one byte each.
Should I use commas in backend keywords?
No. Separate words with spaces. Amazon combines individual words into phrases on its own, so punctuation and repeated words only use up bytes.
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