Keyword Density Checker

Keyword density is the percentage of times a word or phrase appears in your content compared to the total number of words. The formula is (count of keyword / total words) × 100. Per Semrush's keyword-density guide, it's a useful "on-page relevance" signal, even though Google has said it's not a direct ranking factor.

Per Yoast's official keyphrase density check, a density between 0.5% and 3% is the "green bullet" zone. Below 0.5% risks being too sparse for search engines to recognize your topic; above 3% starts to read as forced repetition. Some tools (like behind-the-search.in) use a tighter 0.5–2.5% window, but Yoast is the canonical reference. There is no "perfect" number — write for humans first, then sanity-check with a tool.

No — Google's John Mueller has stated it explicitly: "no, Google does not have a notion of optimal keyword density" (Google SEO office-hours, January 2023, transcribed on Search Engine Roundtable). Google's systems are sophisticated enough to understand what a page is about even when the keyword is mentioned rarely. However, density is still a useful sanity check: extreme stuffing (3–500+ mentions on a single page, per Mueller) hurts readability, and density above 4% is a reliable red flag for content that needs editing.

Stop words are common English words ("the," "a," "and," "of," "to") that carry little SEO relevance on their own. Filtering them produces a cleaner, more actionable density table — "the" appearing 50 times in a 500-word article is normal, not a 10% density hit on a real keyword. Our tool filters ~120 common stop words by default; toggle the filter off to see the raw count.

Yes, completely free — no signup, no email gate, no usage cap. The whole tool runs client-side in JavaScript, so your text is never sent to a server, never logged, never used to train an AI. You can verify this by opening DevTools → Network while using the tool: no outbound requests are made with your content. (Only Vercel's static-asset fetches and our anonymous analytics fire.)