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Keyword Density Checker

Analyze text content to extract keyword frequency metrics and calculate density percentages for single, double, and triple-word phrase combinations.

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Extract single-word, 2-word, and 3-word key phrases from articles or HTML copy, measure frequency distributions, and audit keyword densities client-side to prevent Google search penalties.

Learn About This Tool

Understanding Keyword Density Ratios & Search Engine Over-Optimization

Keyword density measures how frequently specific terms or phrases appear in your body copy relative to the total word count. While search engine crawlers require relevant keywords to categorize page topics, overusing primary keywords triggers search penalties for keyword stuffing. Maintaining a target keyword density between 1.0% and 2.5% signals high topical relevance without over-optimization.
// Keyword Density Ratio Formula:
Density (%) = (Keyword Occurrence Count / Total Word Count) * 100

// Target Density Benchmarks:
Total Words: 1,000 | Keyword Count: 15 -> Density: 1.5% (Ideal Optimal Zone)
Total Words: 1,000 | Keyword Count: 45 -> Density: 4.5% (Warning: Over-optimized)
  • Provides density breakdowns for single keywords, 2-word, and 3-word n-gram key phrases
  • Filters standard English stop words (the, and, in, with) to highlight real content terms
  • Prevents algorithmic search penalties associated with unnatural phrase repetition
  • Audits word frequency distribution across headings, intro, and body paragraphs

Analyzing 2-Word and 3-Word N-Gram Key Phrase Combinations

Modern Search Engine Result Pages (SERPs) evaluate topical completeness using multi-word n-gram phrase combinations rather than isolated single words. Analyzing 2-word and 3-word key phrases reveals whether your article copy incorporates natural secondary search terms and long-tail query variations.
  • 2-Word N-Grams: Identifies core subject pairings (e.g. 'json schema', 'jwt token')
  • 3-Word N-Grams: Tracks long-tail search intent phrases (e.g. 'convert json to sql')
  • Reveals overused layout phrases that can be replaced with varied vocabulary
  • Maintains natural reading flow for human readers while satisfying indexing bots

LSI Keywords & Semantic Vocabulary Expansion

Latent Semantic Indexing (LSI) terms are conceptually related vocabulary words that Google expects to find within a given topic cluster. Incorporating LSI terms and synonyms builds topical authority without artificially inflating your primary keyword count. To check your page's overall SEO title and meta descriptions, use our Meta Tag Generator.
  • Discovers semantic synonyms to replace repetitive target keywords
  • Strengthens E-E-A-T (Experience, Expertise, Authoritativeness, Trustworthiness) signals
  • Ensures header tags (H1, H2, H3) logically align with body phrase frequencies
  • 100% client-side execution ensures your unreleased draft content stays confidential

On-Page Keyword Placement Strategy

Strategic keyword placement carries significantly more SEO weight than sheer frequency. Primary keywords should appear naturally within the first 100 words, in at least one H2 subheading, within the page title, and inside the meta description tag.
  • First 100 Words: Include primary keyword early in the introductory paragraph
  • Headings (H2/H3): Integrate natural 2-word and 3-word key phrase variations
  • Image Alt Text: Add descriptive alt attributes to image tags
  • URL Slug: Keep primary keywords clean and hyphens-separated in the path

How to Use Keyword Density Checker

1

Paste Article Copy or HTML

Enter your raw draft text or HTML template markup into the text editor panel.

2

Inspect Frequency Metrics

Review total word count, unique word counts, and toggle single-word, 2-word, or 3-word phrase density tables.

3

Refine Copy & Balance Density

Toggle stop words filtering to isolate target keywords, adjust over-used phrases, and optimize density levels between 1.0% and 2.5%.

Common questions

What is keyword density?

Keyword density is the percentage ratio of how often a specific keyword or phrase appears within a text document relative to the total word count.

What is the recommended keyword density percentage for SEO?

An optimal keyword density for primary target terms is between 1.0% and 2.5%. Keeping densities below 3.0% prevents search penalty algorithms from flagging your page for keyword stuffing.

What are 2-word and 3-word n-gram key phrases?

N-grams are contiguous sequences of words from a text. 2-word (bigram) and 3-word (trigram) phrases represent long-tail search terms that search engines use to evaluate topical depth.

How does filtering stop words improve keyword analysis?

Stop words (like 'the', 'is', 'and', 'at') occur frequently but carry no search intent value. Filtering them isolates meaningful topic words for accurate density reporting.

What are LSI keywords?

Latent Semantic Indexing (LSI) keywords are terms and synonyms semantically related to your main topic. Using LSI keywords builds topical authority without overusing your main keyword.

Is my text data safe while running this check?

Yes, 100%. All word extraction and density calculations execute locally inside your browser runtime. Zero draft text or HTML markup is transmitted to external servers.

Does the tool strip out HTML tags when analyzing web pages?

Yes. When HTML code is pasted, the tool automatically strips HTML tags (`<div>`, `<p>`, `<a>`) and inline CSS attributes, analyzing only the visible text content.

Does the keyword counter ignore case and punctuation?

Yes. The analyzer converts all text to lowercase and strips punctuation marks so that 'SEO', 'seo', and 'seo,' are counted as identical instances.

What is keyword stuffing?

Keyword stuffing is the practice of overloading a web page with target keywords in an attempt to manipulate search engine rankings, which leads to lower rankings or manual penalties.

Can multi-word phrase densities be lower than single words?

Yes. Because 2-word and 3-word phrases occur less frequently than individual words, a density of 0.5% to 1.0% for a 3-word key phrase is considered strong and effective.

Is there a limit to how much text I can analyze?

The tool handles articles, long-form blog posts, and documentation pages up to 50,000 words smoothly inside browser memory.

Should keywords be placed in H1 and H2 headings?

Yes! Placing primary keywords and 2-word variations in your H1 title and H2 subheadings provides strong relevance signals to search engine crawlers.

Are there keyboard shortcuts?

Press `Ctrl+L` (or `Cmd+L` on Mac) to reset the text input editor instantly.

Does this tool work offline?

Yes. Once loaded, the keyword density analyzer operates 100% offline in your browser sandbox.

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