Keyword Density Checker Online

In the early days of SEO, marketers would blindly stuff keywords into their articles to rank higher on Google. Today, Google actively penalizes "keyword stuffing." To rank on the first page, you need a natural keyword density (typically between 1% and 3%). This tool is built to help content writers and SEO specialists analyze exactly how often specific phrases appear in their text.

Single Words vs N-Grams

Analyzing single words isn't very helpful; words like "the" or "and" will always dominate the results. This tool utilizes an N-Gram tokenization algorithm. It analyzes your text to extract not just single keywords, but 2-word phrases (bigrams) and 3-word phrases (trigrams). This allows you to see if you are overusing "long-tail keywords" like best running shoes.

Stop Word Filtering

To provide actionable SEO data, the script automatically filters out common English "stop words" (e.g., a, is, on, with). By removing the linguistic glue, the tool isolates the actual topical subjects of your article, giving you a mathematically accurate view of your article's semantic focus.

Local Browser Privacy

If you are auditing an unreleased press release or proprietary marketing copy, you shouldn't paste it into a random server. This tool executes the lexical tokenization and counting loops entirely in your browser's local memory. The data is instantly destroyed when you close the tab.