Analyze the keyword frequency and density of any text to optimize your content for search engines and improve readability. Keyword density — the percentage of total words represented by each keyword — is a fundamental SEO metric that helps content creators ensure their target keywords appear at an appropriate frequency. Too low and search engines may not associate your page with the intended topic; too high and it can be flagged as keyword stuffing, which harms rankings. This tool tokenizes your text, counts every word, and displays frequency and density percentages in a sortable table. You can exclude common stopwords and filter out short words to focus on meaningful terms. All analysis runs in your browser — your content is never sent to any server.
About Keyword Density Checker
Keyword density measures how frequently a specific word or phrase appears in a piece of text relative to the total word count, expressed as a percentage: (keyword count ÷ total words) × 100. It is a key indicator in SEO content optimization — search engines use word frequency (among many other signals) to determine what a page is about. The ideal keyword density varies by context, but most SEO practitioners recommend keeping primary keywords between 1-3% density to appear natural. This tool provides a complete frequency analysis with sortable results, showing every word's count and density percentage. Excluding stopwords (common words like "the," "is," "and") lets you focus on the content-bearing terms that matter for SEO. All processing is client-side. For word counting, see our Word Counter, and for readability metrics, try our Reading Time Calculator.
How to Use Keyword Density Checker
- Paste your text content into the input area — this can be a blog post, article, product description, or any text you want to analyze.
- Optionally check Exclude stopwords to filter out common words like "the," "a," "is" that dilute the analysis.
- Optionally check Ignore words 1-2 characters to skip very short words.
- Click Analyze to generate the frequency and density table, sorted by most frequent words first.
- Review the density percentages for your target keywords and adjust your content accordingly.
Key Features
- Complete frequency analysis — Shows every word's count and density percentage in a sortable table.
- Stopword filtering — Exclude common words to focus on meaningful, content-bearing keywords.
- Short word filtering — Ignore 1-2 character words that add noise to the analysis.
- Sorted results — Words are ranked by frequency (most common first) for quick identification of dominant terms.
- Browser-based privacy — Your content is analyzed locally and never sent to any server.
- SEO guidance — Helps identify over-optimized (keyword-stuffed) or under-represented target keywords.
When to Use This Tool
- Optimizing blog posts and articles for target keywords before publishing.
- Checking for keyword stuffing that could trigger search engine penalties.
- Analyzing competitor content to understand their keyword strategy.
- Reviewing product descriptions to ensure key terms are adequately represented.
- Auditing existing pages for SEO improvements during content refresh campaigns.
Technical Details
The tool tokenizes input text by splitting on whitespace and punctuation boundaries, converting all words to lowercase for case-insensitive counting. Stopwords are filtered using a built-in list of common English words (articles, prepositions, conjunctions, auxiliary verbs). Each unique word's count is divided by the total word count to calculate density as a percentage. Results are sorted by count in descending order. The analysis runs entirely in JavaScript with no server communication. For a broader content quality assessment, combine this tool with our Word Counter for length analysis and our Reading Time Calculator for readability estimation.
Conclusion
The Keyword Density Checker is a practical SEO tool that helps you balance keyword usage for better search rankings without over-optimization. With filtering options, sortable results, and complete browser-based privacy, it's an essential part of any content optimization workflow.