Keyword Density Checker — Analyze SEO Keyword Frequency Instantly
Paste any content and instantly see keyword frequency, density %, n-gram analysis, and SEO health score. Perfect for bloggers, SEO writers, and content teams. No login. No uploads.
⚡ All analysis happens in your browser. Your content is never uploaded.
What is Keyword Density and Why Does It Matter for SEO?
Keyword density refers to the percentage of times a keyword appears in your content compared to the total word count. It's one of several on-page SEO factors that search engines like Google use to understand what a page is about.
The formula is simple: (Keyword Count ÷ Total Words) × 100 = Keyword Density %. A density of 1%–2% is generally considered optimal for most content types.
This tool analyzes unigrams (single words), bigrams (2-word phrases), and trigrams (3-word phrases) — giving you a complete picture of how your content reads to both search engines and human readers.
How to Use the Keyword Density Checker
Frequently Asked Questions
What is a good keyword density for SEO in 2025?
Most SEO experts recommend keeping primary keyword density between 1% and 2%. Anything above 3% may be considered keyword stuffing by Google's algorithms, potentially leading to ranking penalties.
Should I use this tool before publishing content?
Yes — running a keyword density check before publishing helps ensure your content is neither under-optimized (too few mentions) nor over-optimized (keyword stuffing). It's a key step in any on-page SEO checklist.
What is the difference between 1-gram, 2-gram, and 3-gram analysis?
A 1-gram (unigram) is a single word. A 2-gram (bigram) is a two-word phrase like "keyword density." A 3-gram (trigram) is a three-word phrase like "keyword density checker." Analyzing all three gives a comprehensive view of your content's SEO structure.
Is my content private when I use this tool?
Absolutely. All analysis runs entirely in your browser using JavaScript. Your content is never sent to any server, never stored, and never shared. It disappears the moment you close the tab.
What does the SEO health score measure?
The SEO health score (0–100) evaluates your content based on word count, unique vocabulary diversity, sentence distribution, and keyword density range. Scores above 70 indicate well-optimized, natural-sounding content.