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Applying this keyword density tool does not help repair your errors so that you can make the appropriate corrections, but it does identify your errors.
What is unique about that keyword density tool is you could input a URL or paste an article, pick some keyword results to display, and how many words per phrase (up to 3 words). In an issue of seconds, your results will show and you'll be able to see the count and density beginning with all the most frequently used words and phrases.
Keyword density is a calculated percent based on the number of times a word or phrase is employed, in comparison with the total word count for this page. SEO elements including keyword density should always take a backseat to quality on your website or article. Otherwise, all Search Engine Optimization efforts are in vain because only pages that are entertaining, interesting, informational, or valuable in almost any other way will keep a sustainable existence in internet search engine results. Nevertheless, it is just as important to use this keyword density tool and avoid the extreme of over- under or optimizing -optimizing. While there aren't any proven guidelines set forth by Google for keyword density, you should keep your primary keyword(s) between 2 and 3%, and secondary keywords (long tail search phrases) between 1 and 2%.