Most ATS rejections aren't caused by being underqualified. They're caused by small, quiet formatting choices that confuse the parser — choices that look completely normal to a human reader but break the software's ability to extract your information correctly.
The difficulty is that you never get told why your resume was filtered out. You submit, hear nothing, and assume you weren't a fit. In many cases, your resume was never actually read. Here are the seven most common causes, with real examples of what fails and what passes.
Mistake 1: Multi-column layouts and text boxes
This is the single most common ATS failure we encounter. Two-column resumes are popular because they look clean and modern — but most ATS parsers read documents left-to-right, top-to-bottom, treating the entire page as one continuous text stream.
What actually happens: imagine your left column contains job titles and company names, and your right column contains dates and locations. The parser reads the entire left column first, then the entire right column. The result looks like: 'Software Engineer, Google, Product Manager, Meta, Senior Engineer, Stripe, 2018–2020, 2020–2022, 2022–2024.' There's no way for the software to connect which dates belong to which role.
Text boxes are even worse. Most parsers skip text boxes entirely. If your skills section or certifications are inside a text box, they simply don't exist in the ATS's version of your resume.
The fix: use a strict single-column layout. Your resume may look less visually impressive, but it will parse correctly. A recruiter who actually sees your resume will read the content, not the layout.
Mistake 2: Contact information in document headers
Many popular resume templates put your name, phone number, and email in the Word document's header region. This looks identical to body text on screen — but it's a separate layer that many ATS parsers skip entirely.
The real-world consequence: a recruiter receives your resume, loves your experience, and goes to call you — but there's no phone number. Your contact info is in a region the parser never extracted.
The fix: delete the header/footer and paste your name and contact information as regular body text at the top of the first page. It can still be formatted to look like a header — it just needs to be real document body text.
Mistake 3: Non-standard section headings
ATS software is trained on millions of resumes and learns to look for specific section heading patterns. Common ones include 'Work Experience,' 'Professional Experience,' 'Education,' 'Skills,' 'Certifications,' and 'Summary.'
Creative alternatives that fail: 'My Journey' (instead of Work Experience), 'What I Know' (instead of Skills), 'Where I've Studied' (instead of Education), 'My Story' (instead of Summary). A human understands all of these immediately — the software often does not.
The fix: use the most common, standard heading for each section. Save your personality for your actual content.
Mistake 4: Image-based resumes
A resume exported as a flattened image — common with Canva templates, Adobe Illustrator exports, or scanned physical resumes — contains zero extractable text. The ATS receives what is essentially a photograph of your resume. No parser can read it.
How to check: open your resume file and try to highlight and copy a sentence with your cursor. If the text selects normally, you're fine. If nothing highlights, or if you can only select the entire image as one object, your resume is image-based.
The fix: recreate your resume in Microsoft Word, Google Docs, or a proper resume builder that exports text-based PDFs. If you love a Canva design, recreate the layout in Word to get the best of both.
Mistake 5: Inconsistent or missing dates
ATS systems use dates to build a timeline of your career. Inconsistent formatting — some roles with 'Jan 2023 – Mar 2025,' others with just '2023–2025,' others with 'January 2023 to March 2025' — makes this timeline harder to parse correctly.
Missing dates are worse. Removing dates from older roles to hide gaps doesn't fool the system — it just creates entries that can't be placed in time, which can cause them to be misread or ignored.
The fix: pick one date format and use it for every role and every educational entry throughout the document.
Mistake 6: Keyword stuffing
Some job seekers try to game ATS keyword matching by adding a hidden block of keywords at the bottom of their resume — sometimes in white text on a white background, sometimes in a tiny font. This used to work on very old, basic systems. Modern ATS platforms are trained to flag this behavior.
Even if the keyword stuffing isn't detected by the software, it will be by the recruiter who reviews the resume after it passes the ATS scan. A block of 50 disconnected keywords at the bottom of an otherwise professional resume is an immediate red flag.
The fix: include keywords naturally throughout your bullet points and summary — in contexts where they're true and connected to real experience.
Mistake 7: Generic file names
'Resume.pdf,' 'CV_Final.pdf,' or 'Resume(3)_FINAL_edited.pdf' are all common and all worth fixing. Some ATS systems log the filename, and it contributes to the professional impression of your submission.
The fix: rename your file to 'FirstName-LastName-Resume.pdf' or 'FirstName-LastName-JobTitle.pdf' for targeted applications. It takes ten seconds and looks significantly more professional.
How to check your resume for all of these at once
Going through this list manually takes time. A faster approach is to upload your resume to a free ATS checker — it scans for all of these issues automatically and gives you a score with specific fixes.
Our checker at atsresumetracer.com runs entirely in your browser (nothing is uploaded to a server), takes about ten seconds, and tells you exactly which of these issues it finds in your specific resume.
Frequently asked questions
Can I tell if a company uses ATS? Most mid-size and large companies do. If you're applying through an online portal (not emailing a resume directly to a person), there's almost certainly an ATS involved.
Will fixing these issues guarantee I get an interview? No — ATS optimization gets your resume in front of a human. After that, your actual experience and fit for the role determines what happens. But if your resume is being filtered out by software, fixing these issues is necessary before anything else can work.
Which ATS systems are most commonly used? Workday, Greenhouse, Lever, iCIMS, Taleo, and BambooHR are among the most widely deployed. They all have slightly different parsing behaviors, which is why broad best practices (single column, standard headings, text-based PDF) tend to work better than optimizing for one specific system.