IconVault's TF-IDF Analyzer ranks up to 8 documents by term frequency-inverse document frequency relevance to your query, with a full per-term score breakdown showing TF, DF, IDF and TF-IDF for every query term in every document. It is the classic information-retrieval measure behind keyword relevance scoring, explained visually instead of as a formula.

Everything runs fully in your browser in JavaScript, so your documents are never uploaded and the tool works offline once loaded. It is free with no signup. The honest note: TF-IDF is a bag-of-words measure, it ignores word order and synonyms, so use it to compare keyword relevance across drafts, not as a final SEO quality score.