Free Online Keyword Density Checker
Analyze keyword density for single words, 2-word, and 3-word phrases. Find your top keywords with frequency counts, density percentages, and SEO optimization tips.
Paste content above to see top keywords
Paste content above to analyze keyword density.
What is a Keyword Density Checker?
A keyword density checker is an SEO tool that measures how frequently each keyword or phrase appears in your content relative to the total word count. Keyword density is expressed as a percentage: if a keyword appears 10 times in a 500-word article, its density is 2%.
What is good keyword density for SEO?
The ideal keyword density for SEO is generally considered to be 1–2% for your primary keyword. Here is what the different ranges mean:
- Under 0.5%: Possibly too low — your content may not be clearly targeting the keyword
- 0.5–1%: Low but acceptable — works well for supporting keywords and long-tail phrases
- 1–2%: Optimal range — signals relevance without appearing manipulative
- 2–3%: Borderline — monitor carefully, especially for shorter pieces
- Over 3%: Over-optimization risk — Google may flag this as keyword stuffing
Important note from Google: Google's Search Advocate John Mueller has stated that keyword density is not a direct ranking factor. What matters more is overall content quality, relevance, and natural language. However, measuring keyword density helps you identify unnatural repetition that could harm readability and user experience.
Why check 2-word and 3-word phrases?
Single-word keyword analysis misses the bigger SEO picture. Long-tail keywords (2–4 words) typically have:
- Lower competition
- Higher conversion intent
- More specific search relevance
Checking 2-word and 3-word phrase density helps you identify which natural phrases are appearing throughout your content — these are often the most valuable for SEO because they match how users actually search.
What are stop words?
Stop words are common function words (the, a, an, is, are, of, in, to, for, etc.) that carry little SEO value. Our checker lets you filter these out to focus on meaningful content keywords. Toggle stop words on to see your full vocabulary; toggle them off to see only meaningful content terms.
How to Use Our Keyword Density Checker
Paste or type your content into the editor on the left. Keyword density results appear instantly in three tabs below:
- Single Words: Every meaningful word with its count and density percentage
- 2-Word Phrases: All bigrams (two consecutive words), sorted by frequency
- 3-Word Phrases: All trigrams (three consecutive words), sorted by frequency
The right sidebar shows the Top 10 Keywords at a glance with proportional density bars.
Toggle stop word filtering using the switch above the results table. With stop words filtered out, you'll see only meaningful content keywords. Turn it off to see all words including common function words.
Watch for the over-optimization warning — any keyword appearing at over 3% density gets a yellow warning badge. This signals potential keyword stuffing that could hurt your SEO.
SEO tips for optimal keyword density:
- Your primary keyword should appear at 1–2% density in body content
- Include your primary keyword naturally in the first 100 words
- Use semantic variations and related terms (LSI keywords) to support your main keyword
- Check your 2-word and 3-word phrase tabs to ensure your key phrases appear naturally throughout
- If a keyword shows over 3% density, consider replacing some instances with synonyms
Frequently Asked Questions
What is keyword density?
Keyword density is the percentage of times a keyword or phrase appears in your text relative to the total word count. It is calculated as: (keyword occurrences / total words) × 100. For example, if 'SEO tool' appears 5 times in a 500-word article, its density is 1%.
What is the ideal keyword density for SEO?
The generally accepted ideal keyword density for SEO is 1–2% for your primary keyword. Going above 3% risks appearing as keyword stuffing to search engines like Google. However, Google's John Mueller has confirmed that keyword density is not a direct ranking factor — focus on natural, useful content and the density will usually fall in the right range automatically.
What is keyword stuffing?
Keyword stuffing is the practice of overloading web content with keywords in an unnatural way to try to manipulate search rankings. It violates Google's Webmaster Guidelines and can result in manual penalties or algorithm-based ranking drops. Signs include the same keyword repeating unnaturally, keyword density above 3–5%, and content that reads awkwardly. Always write for humans first.
What are stop words and should I filter them?
Stop words are common English function words with little semantic value: the, a, an, is, are, was, were, of, in, to, for, on, at, by, with, and, or, but, not, etc. For SEO keyword analysis, it is usually best to filter stop words out so you can focus on meaningful content keywords. Toggle the stop word filter in our tool to see the difference.
Why does this checker show 2-word and 3-word phrases?
Most online content is searched using 2–4 word phrases rather than single words. Long-tail keyword phrases are more specific, have lower competition, and often drive more targeted traffic. Analyzing 2-word and 3-word phrase density helps you ensure your key phrases appear naturally and at an appropriate frequency throughout your content.
How is keyword density calculated?
Keyword density is calculated using the formula: (Number of times keyword appears / Total number of words) × 100 = Keyword density %. Our tool counts all occurrences of each word or phrase (case-insensitive), divides by the total word count, and multiplies by 100 to get the percentage.
Can keyword density analysis help with content optimization?
Yes. While keyword density itself is not a direct ranking factor, analyzing it helps you: (1) ensure your target keyword appears frequently enough to establish relevance, (2) identify unintended keyword stuffing that could hurt readability, (3) spot natural phrase patterns that match real user search queries, and (4) check that secondary keywords and variations appear throughout your content.
What is a keyword density checker used for?
A keyword density checker is used by SEO professionals, content writers, and marketers to analyze how frequently target keywords appear in web content. Common use cases include auditing existing content for keyword optimization, checking competitor content density, verifying that newly written content hits target keyword frequencies, and identifying over-optimized sections that need rewriting.