What is a Keyword Density Checker?
A keyword density checker analyses a piece of text to count how frequently each keyword or phrase appears, and expresses that frequency as a percentage of the total word count. For example, if "email" appears 5 times in a 200-word article, its keyword density is 2.5%. SEO professionals use this metric to ensure content is optimised for target keywords without over-using them.
The generally accepted ideal keyword density range is 1–3%. Below 1%, the content may not rank well for that term because search engines may not perceive it as topically relevant. Above 3–4%, the content risks being flagged for keyword stuffing — a black-hat SEO tactic that can result in ranking penalties. Our tool helps writers and SEO specialists find the sweet spot, identify overused words, and ensure content reads naturally for both humans and search engines.
How to Use the Keyword Density Checker
- Paste your article or page content into the text area.
- Optionally type a specific keyword in the Filter field to focus the results on that term.
- Click Analyse.
- View the top 30 keywords with their count, density percentage, and a Good/Low/High rating badge.
Why Use Our Keyword Density Checker?
- 100% Free — Analyse unlimited content at no cost.
- No Registration — No sign-up needed.
- Browser-Based — Your content stays in your browser and is never sent to a server.
- Stop Word Filtering — Common words (the, and, is…) are excluded so only meaningful keywords are shown.
- Rating Badges — Each keyword is rated Good (1–3%), Low (<1%), or High (>3%) at a glance.
Frequently Asked Questions
Most SEO experts recommend 1–3% for your primary keyword. At this density, the keyword appears often enough for search engines to understand the topic without feeling unnatural to readers. Secondary and related keywords can appear at lower densities (0.5–1%). Focus on natural, helpful writing — modern search engines prioritise content quality over keyword counts.
Keyword stuffing is the practice of excessively repeating a keyword to try to manipulate search rankings. Google's algorithms penalise this — pages with unnaturally high keyword density may rank lower or be removed from search results. It also makes content unpleasant to read, increasing bounce rates. A density above 4–5% is generally considered risky.
It is most useful for long-form content pages (blog posts, service pages, landing pages) where keyword optimisation matters most. For short pages like contact or about pages, keyword density is less relevant. Use this tool as a sanity check rather than a strict rule — content that reads naturally for humans will usually have appropriate density automatically.
It is one of many signals but not as dominant as it was in the early 2000s. Google's algorithms now use semantic understanding (NLP) to assess topical relevance beyond simple keyword counting. However, you still need to use your target keyword and related terms naturally. Keyword density analysis helps ensure you are mentioning important terms without over-doing it.