Before a recruiter ever sees your resume, an Applicant Tracking System (ATS) usually parses it into plain data and matches its content against the job description. University career service guides are unusually consistent about what that means in practice: save the file in a widely readable format, strip out visual decoration, use standard section headings and traditional fonts, and mirror the keywords—both spelled out and abbreviated—that the posting emphasizes. Get those mechanics right and your resume reaches human review; get them wrong and even strong experience can be silently lost.
ATS-Friendly File Formats and Basic Structure
File type is the first decision, because an ATS can only score what it can read. The University of Illinois at Chicago's career services guide is blunt: use a standard Word document saved in .doc format (Word 97-2003), because not all ATS systems can read .docx, PDF, RTF, and JPG files. Other guides take a slightly broader position—Hire Autism lists Microsoft Word, .doc, .docx, and PDF as ATS-recommended formats—so the safest reading is that .doc is the most universally accepted choice, while other formats may work depending on the employer's system.
Structure matters just as much. Use a reverse chronological resume format, as the University of Central Missouri's guide recommends, so the ATS can read your work history as a clear timeline. Label each section with plain, standard headings such as "Summary," "Experience," "Skills," and "Education," because the ATS actively looks for those titles to categorize your information. Always check the application portal's specific upload requirements before submitting, since some employers mandate a particular method or file type.
Optimizing Layout and Visual Elements
The biggest parsing failures come from layouts built for human eyes rather than software. Career advisors at Ohio Northern University describe the problem directly: templates are a combination of fields and tables that can confuse ATS systems, so the format needs to be as plain as possible even when the content is not. Their rule is a single-column, left-aligned layout with no tables, multiple columns, or text boxes.
The same logic extends to decoration. Hire Autism warns against columns, graphs, photos, color blocks, headers, and footers, because the ATS cannot scan these blocks and the information within them will be lost. The Illinois-Chicago guide adds borders, lines, symbols, and shading to the avoid list, noting that standard bullet points are fine. If your current resume leans on graphics or color, plan on rebuilding it in a plain single-column version for applications that pass through an ATS.
