Free Keyword Density Checker

What is keyword density.

Keyword density is the share of a page’s words taken up by a particular word or phrase. If a 1,000-word article uses “running shoes” 15 times, that phrase has a density of 1.5%. It is one of the oldest measurements in SEO, dating from an era when search engines really did count word frequency to work out what a page was about. Modern search engines are far cleverer than that, but the measurement still has a genuinely useful job.

That job is diagnosis. Density will not tell you what to add to a page, but it is very good at exposing what has gone wrong. A target phrase sitting at 5 or 6% almost always means the copy reads awkwardly and was written with one eye on the search engine rather than the reader. Google’s spam policies call this keyword stuffing, and pages that do it tend to underperform, get rewritten in the SERP or get filtered entirely.

The over-optimisation risk cuts the other way too. Sometimes an important page never mentions its own target phrase in the title, the H1 or the opening paragraph, and density analysis surfaces that gap in seconds. The healthy range for a primary phrase is roughly 0.5 to 2.5%, occurring naturally in the places that matter. This tool measures exactly that, for every phrase on the page, not just the one you thought to check.

Here’s how the tool looks:

How the tool works.

When you submit a URL, the page is fetched through a server-side rendering pipeline that executes JavaScript before extraction, so single-page applications and JS-heavy templates are analysed on their real content rather than an empty HTML shell. The extractor isolates the main content and captures the title, meta description and headings separately, since phrase placement in those elements is half the story.

The analysis itself is deterministic text maths, with no AI involved. Common English stopwords are filtered out, then the tool computes the top twenty one-word, two-word and three-word phrases, each with its raw count and density as a share of total words. Your target keyword, if provided, gets its own card showing density against a guidance band: roughly 0.5 to 2.5 percent reads as natural, while anything above 4 percent is flagged as possible over-optimisation. Deliberately warn-level language, because density alone never proves a problem.

Because there is no AI processing cost, results are fast and the rate limits are generous. URL results are cached for 24 hours; paste mode runs entirely on the text you provide and stores nothing beyond the session.

Please Note:

1. This tool is provided for free as-is. Density figures are a diagnostic aid; we make no guarantees about rankings or traffic based on any result shown here.

2. Analysis reflects the page as fetched at the time of the check. Pages behind logins, paywalls or aggressive bot protection may not extract fully; use paste mode instead.

3. URL results are cached for up to 24 hours. Text submitted in paste mode is processed for the analysis only and not stored beyond the session.

4. Guidance bands are editorial rules of thumb, not statements about Google penalties. No density figure on its own indicates a penalty.

FAQ.