The Hidden Risks of Submitting PDF Resumes to an ATS
While PDFs are excellent for ensuring your resume looks exactly the same on every screen, they can inadvertently cause your application to be rejected before a human ever sees it. Here is why the "Standard Professional Format" might actually be working against you.
1. The "Layer" Problem and Image Rejection
Many ATS algorithms are designed to "strip" a document down to its raw text to categorize your skills. If your PDF contains images—such as a professional headshot, icons for contact info, or even decorative graphic lines—the parser may glitch.
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The Rejection Trigger: Some older or more rigid systems are programmed to reject files that contain unreadable "objects" (images) to prevent malware or simply because they cannot "see" the text behind or around the graphic.
2. The "Broken Word" Phenomenon (Text Encoding)
PDFs do not store text as a continuous flow like a Word document does; they store characters as coordinates on a page. When an ATS tries to "suck" the text out of a PDF, it can struggle with the spacing.
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The Result: A perfectly spelled word like Engineer can be imported as Eng ineer or E n g i n e e r.
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The Consequence: If the recruiter searches the database for "Engineer," your resume won't show up because the system doesn't recognize the broken fragments as a keyword match.
3. Column Confusion
If you use a two-column layout in a PDF, a human reads it left-to-right in sections. However, many ATS parsers read a PDF linearly from left to right across the entire page.
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The Result: The system might read the first line of your "Experience" (left column) and merge it with the first line of your "Skills" (right column), creating a nonsensical jumble of data that makes you look unqualified.
4. The "Searchable Text" vs. "Image" Trap
If a user creates a resume in a design tool (like Canva or Photoshop) and saves it as a PDF, it is often saved as a flat image rather than selectable text.
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The Test: If you cannot highlight and copy the text in your PDF with your mouse, an ATS cannot read it either. To the system, your resume is a blank page.
The Professional Recommendation
To ensure 100% readability, the most reliable approach is to:
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Draft in a standard .docx format using a single-column layout.
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Avoid all images, charts, and headers/footers (parsers often skip text inside headers).
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Upload the .docx file unless the application portal explicitly and exclusively requests a PDF.
Pro Tip: If you must use a PDF, always "Save As" a PDF from Word rather than "Printing to PDF," as "Printing" is more likely to create the character-spacing issues that break your keywords apart.