Free Keyword Density Checker - Analyze SEO Keywords in Content

Modern SEO recommends 1-3% keyword density for primary keywords. This means if your article is 1000 words, your main keyword should appear 10-30 times. However, focus on natural writing first! Search engines evolved beyond simple keyword counting - they analyze semantic relationships, context, and readability. Densities above 5% risk keyword stuffing penalties. Below 0.5% may not signal relevance. Rather than obsessing over exact percentages, ensure keywords appear in: title, H1/H2 headings, first 100 words, naturally throughout, and last paragraph.

Yes, but less than before. Modern search algorithms (Google RankBrain, BERT) focus on semantic meaning and user intent rather than exact keyword matches. However, keyword presence is still a baseline ranking signal. You can't rank for "blue widgets" without mentioning "blue widgets" somewhere! Best practice: write naturally for humans first, then check density to ensure you haven't accidentally under or over-optimized. Focus more on related terms (LSI keywords), question answering, and comprehensive coverage than hitting exact density percentages.

Keyword stuffing is unnaturally repeating keywords to manipulate rankings. Example: "Best SEO tools. Our SEO tools are the best SEO tools for SEO." Awful to read! Google penalizes this with lower rankings or removal. Avoid by: keeping density under 5%, using synonyms and related terms, writing for humans not bots, using keywords where they fit naturally, and reading content aloud - if it sounds unnatural, rewrite it. Focus on topic coverage and semantic relevance instead of exact keyword repetition.

Both! Single keywords show overall topic relevance, but phrases (2-3 words) are where most search traffic lives. Long-tail phrases like "best waterproof hiking boots" have lower competition and higher conversion intent than "boots". Our tool analyzes bigrams (2-word phrases) and trigrams (3-word phrases) to help identify natural phrase patterns in your content. Modern SEO focuses on topic clusters - covering a topic comprehensively with related phrases rather than repeating one keyword. Use a mix of primary, secondary, and long-tail keyword phrases.

Keyword density is simple: frequency ÷ total words. TF-IDF (Term Frequency-Inverse Document Frequency) is more sophisticated - it measures how important a term is to a document compared to a corpus of documents. High TF-IDF means a term appears frequently in your document but rarely across the web, suggesting unique, specific content. Google likely uses TF-IDF-inspired algorithms. For practical SEO: use keyword density for baseline optimization (1-3%), then focus on comprehensive topic coverage, using terms competitors miss, and answering questions others don't.

Never! All keyword analysis, frequency counting, density calculations, and phrase detection happen entirely in your browser using JavaScript. Your article content, product descriptions, blog posts, and keyword strategies never leave your device or get sent to any server. This makes it completely safe for analyzing unpublished content, confidential business copy, client content before launch, or proprietary SEO strategies. The tool works offline once loaded. Your content remains 100% private.