Keyword Density & N-Gram Analyzer

Keyword density stopped being a ranking dial years ago — but it never stopped being a diagnostic. Zero density means the page literally never says the thing it wants to rank for, which no amount of semantic understanding fixes. Four-plus percent means a human wrote for a machine, and both notice. The healthy band in this tool (0.5–2.5%) isn't a target to optimize toward; it's the range naturally-written topical copy lands in when it covers a subject properly. Write first, measure second, and treat anything outside the band as a prompt to re-read the copy out loud.

The placement matrix matters more than the raw percentage. Search engines weight where a phrase appears far more than how often: the title and H1 declare the topic, the first hundred words confirm the page delivers it, the URL slug and image alts corroborate it. A page with 1% density but the phrase in all six positions will beat a 3%-density page that buries it in body copy. That's also why this tool asks for your title, description and URL — or extracts them automatically when you paste full HTML.

N-grams are the honest “what is this page about” view. The 2-gram and 3-gram tables surface the phrases you actually repeat — which is either reassuring (your topic dominates) or alarming (a template sentence appears eleven times). The stop-word-boundary rule means the tables show real topical phrases like “rock plate” rather than junk like “of the”. Any 3-gram above 1% of all trigrams gets flagged: that's the empirical line where repetition starts reading as boilerplate.

For the full picture, run the page through the 85-check SEO audit (it runs this same keyword engine plus everything else), check the copy's reading level in the Readability Scorer, and make sure the title you optimized actually fits the SERP in the pixel-accurate preview.