Keyword Density Checker
Paste your content to see the most frequent keywords and their density percentage. Useful for SEO content optimization.
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What is Keyword Density Checker?
Keyword density is the percentage of times a specific keyword appears in a text relative to the total word count, calculated as: (keyword occurrences ÷ total words) × 100. The widely cited guideline is a 1–3% density range: below 1% and Google may not recognize the page as topically relevant to that term; above 3% and the content reads unnaturally and risks a keyword-stuffing algorithmic penalty. Modern search engine optimization goes significantly beyond raw density — Google's algorithms use TF-IDF (Term Frequency–Inverse Document Frequency) to measure keyword relevance against a corpus of documents, meaning context and co-occurring terms matter more than simple repetition. LSI keywords (semantically related terms) signal topical authority more effectively than keyword repetition alone.
How to use
- Paste your article content into the input area — keyword density analysis runs instantly.
- Review the top keywords list and their density percentages.
- Identify your primary target keyword and check whether its density falls within the 1–3% range.
- If a keyword is above 3%, replace some instances with synonyms or related terms to read more naturally.
- If a keyword is below 1%, consider adding it to your introduction, a subheading, or the conclusion.
Why it matters
Keyword stuffing — pushing density above 5% — was a common SEO tactic in the early 2000s that Google now penalises algorithmically and manually. Under-density means the page may not rank for the target term at all, leaving traffic on the table. Checking density before publishing catches both extremes and ensures your content is optimised without appearing manipulative. More importantly, this analysis reveals opportunities to introduce synonyms and related terms that expand your semantic footprint, helping the page rank for a wider range of related search queries rather than just the single exact-match keyword.
Pro tip
Modern SEO best practice: place your primary keyword in the page title, the first paragraph, one H2 subheading, and the URL slug. Then let it appear naturally in the body text — do not force it. Fill the remaining semantic space with related terms. For a 'mortgage calculator' article, those terms include: amortization, principal, interest rate, monthly payment, and loan term. This broader semantic coverage helps the page rank for dozens of related queries rather than just the exact keyword phrase, multiplying your organic traffic potential.