Word Frequency and Keyword Density

Reading the numbers for SEO: density is each word's count divided by the total word count. As a rule of thumb, a target keyword sitting around 1-2% density reads naturally; anything above roughly 4-5% starts to look like keyword stuffing to both readers and search engines. The 2-word and 3-word phrase tables surface the long-tail keyphrases your text actually emphasizes, which is often more useful than single-word counts. The stopword filter removes about 120 common English words (the, and, of, to...) so meaningful terms rise to the top; phrases are dropped only when every word in them is a stopword. Everything runs locally in your browser.