An applicant tracking system, or ATS, scans and ranks your resume before a human ever opens it. To get through, keep the formatting simple, use the exact language from the job posting, and save the file in the format the employer asks for. Nearly every large employer uses one, so treating this step casually can knock out an otherwise strong application before anyone reads it.
What Is an Applicant Tracking System, and How Does It Actually Work?
An Applicant Tracking System (ATS) is a software that employers use to collect, scan, and rank job applications. When you submit a resume, the system parses the text into fields like work history, skills, and education, then scores or sorts candidates based on how closely that text matches the job posting. A recruiter typically only reviews the resumes the system ranks highest, or the ones that pass a minimum keyword threshold.
This isn’t a niche tool. A 2026 analysis by Jobscan found an ATS behind the career pages of 97.4% of Fortune 500 companies, and the software has spread well beyond large corporations into mid-size and small employers too.
What Should You Actually Change in Your Resume Format?
Formatting is where well-qualified candidates most often lose points, not because they lack the right experience, but because the system can’t read it correctly.
- Use a traditional, single-column layout instead of a multi-column or template-heavy design
- Label sections with standard terms like Work Experience, Education, and Skills, not creative alternatives
- Avoid tables, text boxes, icons, and images, since many systems can’t parse them
- Keep contact information in the main body of the resume, not in a header or footer
- Use simple bullet points, like a solid circle or a dash, instead of decorative symbols
A clean, well-organized layout reads just as well once it reaches a person, and it’s the only kind that reliably survives the system first.
How Do You Use Keywords Without Keyword-Stuffing?
Pull the exact skills, tools, and qualifications listed in the job posting, and use that same phrasing in your resume, matching abbreviations too. If the posting says “SEO,” using only “search engine optimization” in your resume can cost you a match, so include both when space allows.
Spread those keywords naturally across your summary, skills, and experience sections, instead of listing them once at the top. The line between optimizing and stuffing is whether a human would still find the sentence believable. “Managed SEO campaigns that grew organic traffic 40% in six months” passes that test. A skills section with the same keyword repeated five times does not.
Should You Submit Your Resume as a PDF or a Word Document?
Unless the job posting specifically asks for a PDF, a Word document (.doc or .docx) is the safer default. Older or less sophisticated ATS platforms have a harder time parsing PDFs correctly, and a parsing error can scramble your work history before a recruiter ever sees it. Modern systems handle PDFs much better than they used to, but “better” still isn’t “guaranteed.”
When the posting does specify a format, follow it exactly. That instruction is often the first, simplest test of whether you read the job posting closely.
Is It Worth Using an ATS Resume Checker Before You Apply?
Running your resume through a checker tool before you apply is worth the few minutes it takes, mainly to catch formatting problems you can’t see by eye, like a table that looks fine on screen but parses into gibberish. It’s a useful second opinion, not a guarantee.
Treat a high match score as a signal, not a goal. A resume that scores well but reads like a list of disconnected keywords will still lose to a well-written one once it reaches a person, so use these tools to catch real problems, not to chase a perfect number. The same care is worth applying to the rest of your job-search materials, since a LinkedIn headline and a professional bio are both doing similar work: getting you noticed before anyone reads your full story.
Frequently Asked Questions
Does tailoring my resume for each job actually matter that much?
Yes. A generic resume sent to every posting usually misses enough of the specific keywords to rank poorly, even when the candidate is genuinely qualified for the role.
Can a human recruiter reject a resume that passes the ATS?
Yes. Passing the ATS gets your resume in front of a person, it doesn’t guarantee an interview. The content still has to hold up once someone actually reads it.
Do ATS systems actually reject qualified candidates?
They can, usually over formatting issues or missing keywords rather than a true skills gap, which is exactly why format and keyword matching are worth the extra attention before you submit.