Amazon U.S. · Generic keyword field
Characters are not bytes.
Measure the actual UTF-8 byte length of backend search terms and review avoidable repetition before pasting them into Seller Central.
Generic keywords
Byte budget
Paste backend terms to count their UTF-8 bytes.
Why this counts bytes, not characters
For Amazon U.S. Generic keywords, Amazon’s guidance uses a limit of less than 250 bytes, so this checker treats 249 bytes as the usable maximum. English letters and digits normally use one UTF-8 byte each, while characters such as ä, €, and emoji use multiple bytes. Spaces are included in this tool’s raw UTF-8 total for a conservative count.
The review also points out repeated words, uppercase letters, punctuation, common short words, ASIN-like values, temporary wording, and subjective terms listed in Amazon guidance. It cannot know whether a term is relevant, whether a word is a brand, or whether Amazon will index any supplied term.
Official sources checked 2 October 2026: Amazon Seller Central — Use search terms effectively and Amazon staff Quick Tip — Search Terms. Guidance can change. TNAADO is independent and is not affiliated with or endorsed by Amazon.
Byte-count details
Why does the tool say 249 instead of 250?
Amazon’s U.S. wording says the search terms must be less than 250 bytes. The largest whole-byte total that satisfies that wording is 249.
What does “Copy byte-safe prefix” do?
If the text is too long, it copies the longest starting portion that fits in 249 UTF-8 bytes without cutting a multi-byte character. Review the result for incomplete words before using it.
Drafting aid, not indexing proof
Amazon may ignore search terms for reasons beyond length. Verify the final value and current category requirements in Seller Central.