Ideal Keyword density is very important for on page seo optimization. We can maintain this ideal density of keywords with best seo tools for calculating keyword percentage i.e. No. Of time a keyword is repeating in an article. Google gives importance to optimal keyword density for ranking in search results that's why it is necessary to find best websites to check seo keywords / suggestions. Google doesn't have any tool or calculator for keyword analyzing but there are 10 tools given below in this article. Link to these 10 websites are also given in brief reviews. These are keyword checker free to use. This is the perfect seo book on internet and helps you in site keyword checking for free. Read: Best Domain Authority Checker & Top 5 Keyword research tools 1. Free Keyword Density Analyser Tool SEOBook is best place for wonderful seo tools and services around the web and their results are quite accurate which helps in SEO optimization with