Keyword Density Checker analyzes text content and calculates the frequency of individual words and multi-word phrases as a percentage of total word count. It strips HTML tags, ignores common stop words (the, and, is, etc.), and supports n-gram analysis from unigrams through trigrams to surface both single-keyword and long-tail phrase densities. The tool flags over-optimized content where any keyword exceeds recommended thresholds, typically 2-3 percent for primary keywords, helping writers avoid search engine penalties for keyword stuffing.
SEO content writers optimizing articles, digital marketers auditing landing pages, and editorial teams reviewing content before publication. The tool runs entirely in your browser — your data never leaves your device.
Learn more about related topics: TF-IDF, Keyword stuffing, On-page SEO, Content optimization.
Keyword Density Checker is a free, browser-based developer tool on AIDToolStack. Analyze keyword frequency and density in text for SEO optimization. It requires no installation or sign-up and works entirely in your browser.
Yes, completely free. Keyword Density Checker has no usage limits, no account requirements, and no hidden fees. Use it as often as you need.
No, all processing happens locally in your browser. Your data never leaves your device and nothing is sent to any server.
Yes, it works in any modern browser on both desktop and mobile devices. No app download required — just open the page and start using it.
AIDToolStack tools run entirely in your browser with no server processing. This means faster results, complete privacy, and zero downtime. There are no ads blocking your workflow, and everything is free with no sign-up required.
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