How to Make Your Resume ATS-Friendly

An applicant tracking system (ATS) is software that employers use to collect, sort, scan, and rank job applications. Over 97% of Fortune 500 companies and a growing majority of mid-size businesses use some form of ATS. Popular systems include Greenhouse, Lever, Workday, iCIMS, and Taleo. When you submit your resume online, it rarely goes straight to a recruiter. Instead, the ATS parses the document, extracts text into structured data fields, and scores it against the job description. Resumes that do not meet a minimum threshold are filtered out before any human sees them. Estimates suggest that 70-75% of resumes are rejected at this stage. This means that even a perfectly qualified candidate can be eliminated by a resume that is poorly formatted for machine reading. Understanding how ATS works is not optional — it is a fundamental job-search skill in 2026.

ATS parsers work by scanning your document for recognizable patterns and mapping content to predefined fields: name, contact info, work history, education, skills. The parser reads the document top to bottom and relies on standard section headings to categorize information. When parsing goes wrong, it is usually because the resume uses non-standard formatting. A two-column layout might cause the parser to merge text from both columns into a single garbled line. A creative section heading like "Where I've Made My Mark" instead of "Work Experience" may cause the parser to skip the entire section. A table used for layout might have its contents read in the wrong order. Modern ATS platforms have improved significantly, but they are still far from perfect. The safest approach is to use a clean, single-column layout with standard section headings and minimal formatting. Let your content do the work, not your design.

Following a few key formatting rules will dramatically improve your ATS compatibility. Use a single-column layout. Multi-column designs, text boxes, and tables confuse most parsers. Stick to a straightforward top-to-bottom flow. Use standard section headings. The ATS looks for headings like "Work Experience," "Education," "Skills," and "Summary" or "Professional Summary." Creative headings may not be recognized. Avoid headers and footers. Many ATS systems cannot read content placed in the header or footer area of a document. Your name and contact information should be in the main body of the resume. Use standard bullet characters. Simple round bullets or hyphens are universally supported. Fancy symbols, icons, or emojis may be stripped or rendered as gibberish. Stick to common fonts. Arial, Calibri, Times New Roman, Garamond, and similar widely available fonts ensure consistent rendering. Avoid decorative or uncommon fonts.

ATS scoring is heavily keyword-driven. The system compares words and phrases in your resume against those in the job description and calculates a match percentage. The higher your match rate, the more likely your resume is to surface to a recruiter. Start by reading the job description carefully. Highlight specific skills, tools, certifications, and qualifications mentioned. Then ensure those exact terms appear in your resume where they honestly apply. If the job asks for "project management" and "stakeholder communication," those phrases should appear verbatim in your skills section or experience bullets. This is not about dishonesty or keyword stuffing. Keyword stuffing — hiding white text, repeating terms unnaturally, or listing skills you do not have — is easily detected by modern ATS systems and will get your application flagged or rejected. The goal is to describe your genuine experience using the same language the employer uses. Pay attention to both hard skills (specific tools, technologies, methodologies) and soft skills (leadership, collaboration, problem-solving). While hard skills carry more weight in ATS scoring, many systems also check for soft skill keywords that appear in the job posting.

The file format you submit matters more than you might think. Most ATS systems handle .docx files reliably, and many also parse PDF files well. However, some older systems struggle with PDFs, especially those generated from design tools like Canva or InDesign that embed text as images. When given the option, submit a .docx file unless the posting specifically requests PDF. If you do submit a PDF, ensure it is a text-based PDF (you should be able to select and copy text from it). StellaCV generates text-based PDFs that maintain ATS compatibility while looking polished. Avoid submitting .pages, .odt, or image files (.jpg, .png). These formats are either unsupported or poorly parsed by most ATS platforms. File naming also matters — use a clear, professional naming convention like "FirstName_LastName_Resume.pdf" rather than "resume_final_v3 (2).docx."

Beyond formatting, several content-related mistakes can tank your ATS score. Using acronyms without spelling them out is a frequent issue. If the job description says "Search Engine Optimization" and your resume only says "SEO," the ATS might not make the connection. Include both the full term and the acronym the first time you mention it. Another mistake is omitting a dedicated skills section. Even if your skills are demonstrated throughout your experience bullets, a separate skills section gives the ATS a clean, parseable list of keywords to match against the job requirements. Failing to tailor your resume is perhaps the biggest ATS mistake of all. A one-size-fits-all resume will never score as well as one that is specifically aligned with the target posting. Take fifteen minutes per application to adjust your keywords, reorder your bullets, and update your summary.

One of the best ways to improve your ATS performance is to test your resume before you submit it. StellaCV includes a built-in ATS scoring engine that analyzes your resume across 18 weighted checks, including keyword density, formatting compliance, section completeness, and readability. The ATS scorer runs in real time as you edit your resume in StellaCV's editor. You will see a score badge that updates instantly, along with a detailed breakdown of each check and specific recommendations for improvement. This means you can iterate on your resume and watch your score improve with each change. The scoring algorithm is modeled on how real ATS platforms evaluate resumes, covering factors like whether you have a professional summary, whether your experience bullets include measurable results, whether your skills section contains enough relevant keywords, and whether your formatting is clean and parseable. Use the ATS scorer as a pre-flight checklist before every application. A score above 80 indicates strong ATS compatibility, while a score below 60 suggests significant issues that could prevent your resume from reaching a recruiter. The detailed breakdown tells you exactly what to fix, taking the guesswork out of resume optimization.