Last updated April 2026.
Most resume advice is opinion. This is not. The ATS-rejection patterns below are documented in Jobscan's 2024 ATS report and matched against thousands of real ProfVault parses. The seven mistakes below are mechanical parsing failures — the ATS literally cannot read your resume correctly when they are present, and the resulting profile is what the recruiter actually sees. None of them are aesthetic. All of them are fixable in one sitting.
1. Image-based PDFs
You scanned your resume, or printed-to-PDF from a tool that flattened the text into an image. Test: open the PDF, try to select a sentence with your cursor. If you cannot, the ATS sees the same thing you cannot — pixels with no text underneath. Result: empty profile, instant filter.
Fix: export from Word/Google Docs/Pages directly to PDF. Never print-to-image.
2. Two-column layouts
About half of all ATS parsers in 2026 still get confused by two-column layouts and read across columns instead of down them. The output looks like: "Lead Engineer Stripe Bachelor of Science Computer Science 2018" — which the parser then cannot map to a real work history.
Fix: single column, full width. The visual hit is small. The parsing risk is large.
3. Headers and footers with critical info
Phone number, email, address, or LinkedIn URL placed inside a Word/Pages header or footer element. Many ATS parsers strip headers/footers entirely as boilerplate.
Fix: put your contact info in the document body, top of the first page.
4. Non-standard section names
"My Journey" instead of "Experience." "Knowledge" instead of "Skills." "Adventures" instead of "Education." Cute on a personal site; invisible to a parser that is looking for the literal strings Experience, Education, Skills, Projects.
Fix: boring section names. The recruiter does not care; the parser does.
5. Date formats the parser cannot read
1/22 - Now. Jan'22 → Present. 2022 - current. These all fail to parse into a date range about 30% of the time, which means the ATS records the role with no end date — or no start date — and your tenure calculation breaks.
Fix: Jan 2022 – Present or January 2022 – Present. Spelled out, en-dash or hyphen, four-digit years.
6. Skills hidden inside paragraph prose
Burying "Python, Kubernetes, GraphQL" inside a four-line description of a project is fine for human readability but reduces the chance those keywords are scored against the JD's keyword list. Most ATS scoring engines weigh a dedicated Skills section much higher than mentions in prose.
Fix: keep a short, dedicated Skills section with the literal keywords from the JD, in addition to mentioning them in prose.
7. Tables for layout
Using tables to align columns of text — common in older Word templates — causes most parsers to read row-by-row and merge content from unrelated cells. The output is gibberish from the parser's perspective.
Fix: if you need columns, use the document's column feature or simple tabbed indents, not table elements.
The meta-mistake
None of these are visible to you when you preview your resume. You see a beautiful PDF; the ATS sees a broken record. The cheap fix is to upload your resume to any ATS-preview tool — or to ProfVault, which shows you the parsed structure side-by-side with the original (this is the same parsing the supported ATS platforms apply to your submission), so you can see exactly what the recruiter's system extracted.
Most "my resume is great but I am getting no callbacks" stories trace back to one of the seven items above. Fix them, and your application enters the recruiter's queue intact, which is the only thing the resume has to do at this stage.
FAQ
How do I check if my PDF is image-based or text-based?
Open the PDF, try to highlight a sentence with your cursor. If you can select the text, it is text-based and the ATS can read it. If your cursor draws a marquee around an image instead, it is image-based and the ATS sees nothing.
Is a Word document safer than a PDF?
About the same. The risk is in image-based PDFs specifically, not in PDFs as a format. If you export from Word/Docs/Pages directly to PDF, you are fine. Both .docx and a text-based PDF parse cleanly across every major ATS.
Which of the 7 mistakes is the worst?
The image-based PDF. The other six degrade your application; this one zeroes it out — your resume becomes an empty profile to the recruiter.
Are these mistakes scored against me automatically, or only by recruiters?
Both. ATS scoring engines down-rank profiles with empty or jumbled fields, so a parsing failure is invisibly costing you keyword-match points before any recruiter sees the file. The ATS guide covers how the scoring works.
My old resume worked fine — why suddenly not?
ATS parsers were rebuilt in 2023–2024 around layout-aware models and (in some cases) LLM extraction. Documents that scraped through older regex parsers sometimes break the new ones. If you have not refreshed your resume since 2023, run it through any ATS-preview tool — including ProfVault's parser — and look at the output.
Related reading
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