Amazon Title & Backend Keyword Character / Byte Counter

Paste your Amazon title, bullet points and backend search terms — see the character count, UTF-8 byte count, and where your title gets cut off on mobile, live as you type. Catch a blown 250-byte backend limit before Amazon silently drops your keywords.

Product title Limit 200 characters (some categories 250). Only ~80 characters show on mobile.

0 / 200 chars 0 bytes Mobile OK

Bullet points (key product features) Up to 5 bullets. Aim for ≤200 characters each; some categories allow up to 500.

Backend search terms Hidden keyword field. Hard limit 250 bytes total — go over and Amazon indexes none of it.

0 / 250 bytes

Byte count matters, not character count — accented letters and emoji cost 2–4 bytes each.

How the limits work. Amazon measures the title and bullets by character count, but the backend search-term field by UTF-8 byte count. Plain English letters, digits and spaces are 1 byte each; accented characters (é, ñ), symbols and emoji take 2–4 bytes. The mobile preview is an approximation of where Amazon's search results truncate a title on a phone — treat it as a guide, not an exact pixel match.

Frequently asked questions

Why does Amazon count backend keywords in bytes instead of characters?

Amazon's backend search-term field has a 250-byte limit, not a 250-character limit. In UTF-8 encoding, ordinary English letters and digits are one byte each, so 250 bytes equals 250 characters — but accented letters, non-Latin scripts and emoji take 2 to 4 bytes each, which uses up the limit faster. If you go over 250 bytes, Amazon stops indexing the entire field, so those keywords do nothing. This tool counts the real byte length so you know exactly where you stand.

What is the mobile title cutoff?

Even though a title can be up to 200 characters, mobile search results only show roughly the first 80 characters before truncating with an ellipsis. Most Amazon shopping happens on phones, so your most important keywords and selling points should come first. The preview above shows an approximate cutoff point — it's a visual guide based on average width, not an exact match for every device.

Is anything sent to a server?

No. All counting happens in your browser with JavaScript — your listing text never leaves your device. It works offline once the page has loaded, and there's no signup.