Our ATS guide already covered the 5 most critical mistakes; here we map the same problem across a wider set of categories β because design mistakes go well beyond "don't use columns." Below is a map of mistake categories that cause HR software to tag a resume as "blank" or "unreadable," each with concrete examples.
Layout Mistakes
- Multi-column layouts: A parser reads left to right, top to bottom; when it jumps between columns, sentences get scrambled together.
- Text boxes: Text-box elements in Word/Canva are often entirely invisible to a parser β or the text inside them merges with text outside them into a meaningless block.
- Tables: Placing your experience or skills list into table cells can scramble the order of lines depending on how the parser interprets cell boundaries.
- Critical data in headers/footers: When contact information lives in the page header, some older ATS platforms never scan that region at all.
Visual Element Mistakes
- Icons and symbols: Phone/email icons are usually harmless, but star/dot icons meant to show skill level are completely skipped by an ATS β express skill level in words instead.
- Progress bars: Visual bars like "English 80%" are meaningless to both an ATS and most recruiters (what does 80% even mean?) β write out the level instead ("Advanced β comfortable with business correspondence").
- Photo placement: The photo itself is usually harmless, but text wrapped around it can confuse the parser.
Typography Mistakes
- Non-standard fonts: Handwriting or decorative fonts can cause characters to be misread (e.g., "l" read as "1").
- Font size too small: Text under 9pt reduces reliability in some OCR/parsing engines.
- Low-contrast color combinations: Color pairings chosen for visual appeal can reduce readability in systems that extract images from PDFs.
File Format Mistakes
- Scanned/image-based PDFs: A PDF whose text can't be selected is a completely blank page to an ATS.
- Bad file names: Names like "Resume_final_v3_REAL.pdf" look unprofessional; use
FirstName_LastName_CV.pdf. - Password-protected PDFs: Some systems can't open password-protected files at all.
A Practical Self-Test
The simplest way to test your own resume: open the PDF, select all the text with Ctrl+A, and paste it into a plain text editor. If the pasted text is readable and comes out in a sensible order, most parsers will read it the same way. If it comes out scrambled or can't be selected at all, you need to simplify the design.