SEO & Readability Highlighter
🔴 Stuffing >1.5% (0)🟡 Overused >1% (0)🔵 High >0.5% (0)
0
FK Score
Post-grad
Very difficult
Avg 0 words/sentence
Total words
0
Sentences
0
Hard sentences
0
Passive voice
0
Adverbs (-ly)
0
Stuffing words
0
✅ Ideal targets
🔑 Keyword density <1.5% per word
📖 Flesch score >60 (8th grade)
📝 Sentences <20 words on average
🟢 Passive voice <10% of sentences
🟣 Adverbs — use sparingly
About this tool
See exactly where your problems are. This highlighter marks dense keywords, long and hard-to-read sentences, passive voice and adverbs right inside your content, with separate SEO and readability views or a combined mode — like a Hemingway-style editor built for search.
Frequently asked questions
What do the colours mean?
Red marks very hard sentences or stuffed keywords, orange marks hard sentences, green marks passive voice, and purple marks adverbs. Hover any highlight for details.
Why highlight passive voice and adverbs?
Heavy passive voice and adverb use make content harder to read, which can increase bounce rate and weaken engagement signals.