The ATS score is a guide, not a guarantee — it rewards a clean single-column layout, standard section headings, complete contact details, action verbs and quantified results, and a sensible length, because those are what real applicant-tracking systems parse most reliably. Two-column templates look sharp but some older systems misread them, so the checker flags that. Keyword matching is a plain word comparison done entirely in your browser. Your draft and everything you type stay in this browser's local storage on this device and are never uploaded.