Keyword Density Checker

Keyword Density Checker is a free online SEO tool that analyses any block of text and calculates how frequently each word appears, expressed as a percentage of the total word count. Paste your article, blog post, or web page content and the tool instantly shows you your top keywords, how many times each appears, and what percentage of the text each represents. This helps you optimise content for search engines without over-using or under-using any particular keyword.

Keyword density is the ratio of how many times a keyword appears in a piece of content compared to the total word count, expressed as a percentage. For example, if the word "running shoes" appears 10 times in a 500-word article, the keyword density is 2%. Historically, SEO practitioners targeted specific density ranges — often 2–5% — based on the belief that higher repetition signalled stronger relevance to search engines. This led to the practice of keyword stuffing, where the same phrase was repeated unnaturally throughout content in an attempt to manipulate rankings.

Google's algorithm has evolved significantly since the keyword-stuffing era. Modern ranking relies far more on semantic relevance, user intent, and content quality than raw keyword repetition. Google's Panda and Hummingbird updates specifically targeted thin, keyword-stuffed content. Today, most SEO professionals recommend a primary keyword density of 1–2% — enough to establish clear topical relevance without triggering over-optimisation signals. Synonyms, related terms, and semantically connected phrases are now equally important for demonstrating content depth to search engines.

Despite the shift away from rigid density targets, Keyword Density Checker remains a valuable diagnostic tool. It helps you spot keywords you are inadvertently over-using (which can feel repetitive to readers and trigger spam filters), identify keywords that appear too rarely relative to the page's stated topic, ensure your primary keyword appears early in the content (ideally in the first 100 words and in at least one heading), and audit competitor content to understand what terms they emphasise. Use the data to inform judgment, not to hit arbitrary percentages.

SEO professionals use Keyword Density Checker when auditing existing content for over-optimisation or thin topical coverage. Content writers run a final check before publishing to ensure their primary keyword is naturally distributed throughout the piece. Digital marketing teams analyse competitor content to identify keyword patterns and gap opportunities. Copywriters reviewing long-form content use it to spot repetitive phrasing that affects readability independently of SEO considerations.

Stop words — common function words like "the", "a", "is", "and", "of", "in", "to" — are typically excluded from keyword density analysis because they appear in every piece of writing and carry no topical signal. Our tool automatically filters stop words and focuses the analysis on meaningful content keywords. You can review the full frequency table to see both included and excluded terms. For multi-word phrase analysis (bigrams and trigrams), the tool can identify two- and three-word combinations that occur frequently — these are often more revealing than single-word frequencies.

Keyword Density Checker processes your text entirely in your browser. The tool splits your content into individual words, normalises them to lowercase, filters stop words, counts occurrences, and calculates each term's percentage of the total word count. Results are displayed in a sortable table so you can quickly find your most-used terms. No data is sent to any server and no content is stored.