Keyword Density Checker calculates how frequently specific words or phrases appear in a piece of text or on a webpage. After scanning content, it provides a ratio of targeted keywords to total words. This helps ensure you haven’t overused or underused important search terms. Proper keyword density influences readability and on-page SEO. Overstuffing can harm user experience (and risk penalties for spammy techniques), while ignoring core terms might hurt relevance. By carefully balancing your primary and secondary keywords, you improve SEO signals without sacrificing a natural flow for readers.