ATS resume mistakes are silent killers. You will never receive an error message telling you that your resume failed to parse, that your keywords did not match, or that your formatting confused the system. You will simply hear nothing. No rejection email, no feedback, no explanation. Just silence.
The frustrating part is that most of these mistakes are easy to fix once you know what they are. This guide covers the fifteen most common ATS resume mistakes, explains why each one causes problems, and tells you exactly how to fix it.
Mistake 1: Using Tables for Layout
Tables are the single most common cause of ATS parsing failures. Many resume templates, including popular ones from Microsoft Word’s built-in gallery, use invisible tables to create multi-column layouts. The table borders are hidden, so the resume looks clean to a human reader, but the ATS sees the underlying table structure and may read the cells in the wrong order.
When a parser encounters a table, it might read across rows instead of down columns, merging your job title with your graduation date or your skills with your address. The result is garbled data that makes your resume unintelligible in the ATS database.
The fix: Remove all tables from your resume. Use a single-column layout with standard paragraph formatting. If you need to separate items on the same line (like city and date), use a simple tab stop, not a table cell. Our ATS-optimized templates use clean formatting without any tables.
Mistake 2: Placing Contact Information in Headers or Footers
Document headers and footers seem like a natural place for your name, email, and phone number. They stay visible on every page and keep the main body free for content. Unfortunately, some ATS parsers skip headers and footers entirely during text extraction.
When this happens, the ATS creates a candidate record with no name, no email, and no phone number. Even if the rest of your resume parses perfectly, the recruiter has no way to contact you.
The fix: Place all contact information in the main body of the document, at the very top. Your name should be the first text element, followed by your email, phone, LinkedIn URL, and location.
Mistake 3: Submitting the Wrong File Format
File format matters more than most people realize. While .docx and text-based PDFs are generally safe, other formats can cause complete parsing failures.
Problematic formats include:
- Image-based PDFs: PDFs created by scanning a printed document or exporting from graphic design tools sometimes embed text as images. The parser cannot read text from images without OCR, which is error-prone.
- Apple Pages files (.pages): Most ATS platforms cannot open .pages files at all.
- Rich Text Format (.rtf): Parsing support is inconsistent across platforms.
- Image files (.jpg, .png): These cannot be parsed whatsoever.
The fix: Save your resume as .docx for maximum compatibility. If you prefer PDF, ensure you can select and copy the text in the file. If you cannot select text, the ATS cannot read it either. For more details, see our guide on DOCX vs. PDF for ATS.
Mistake 4: Using Creative or Non-Standard Section Headings
ATS parsers identify resume sections by matching headings against a database of expected labels. “Work Experience,” “Education,” and “Skills” are universally recognized. “My Professional Journey,” “Learning Adventures,” and “Tech Arsenal” are not.
When the parser cannot identify a section, the content beneath it may be miscategorized, attributed to the wrong section, or ignored entirely. Your work experience might be treated as a general text block rather than a structured employment history, which means job titles, dates, and company names are not extracted into their proper fields.
The fix: Use standard, universally recognized section headings. Stick with: Professional Experience, Work Experience, Education, Skills, Technical Skills, Projects, Certifications, and Summary.
Mistake 5: Not Tailoring Keywords to the Job Description
Submitting the same generic resume to every job is the most widespread strategic mistake in job searching. Every job posting uses specific language, mentions particular skills, and emphasizes certain qualifications. The ATS scores your resume based on how closely your content matches that specific posting.
A resume that scores 85 percent for one role might score 50 percent for a similar role at a different company simply because the two postings use different terminology for the same concepts.
The fix: For every application, read the job description carefully and incorporate its specific keywords into your resume. Match the exact terminology used in the posting. Use tools like Teal to identify which keywords you are missing and where to add them. Our guide on tailoring your resume to a job description provides a step-by-step process.
Mistake 6: Using Graphics, Icons, and Images
Photographs, skill bar charts, icons next to section headings, company logos, and decorative graphics are all invisible to ATS text parsers. The parser extracts text; it cannot interpret images.
This means if you use a star icon next to your email address, the ATS might not extract your email. If your skills are represented as graphical progress bars, the ATS sees no skills at all. If you include a headshot photograph, it takes up space that could be used for text content while providing zero value to the parser.
The fix: Replace all visual elements with plain text. List skills as text, not progress bars. Use text labels, not icons. Remove photographs and logos entirely.
Mistake 7: Using a Multi-Column Layout
Two-column and three-column resume layouts create reading order confusion for ATS parsers. The parser may read across both columns on the same horizontal line instead of reading down each column sequentially. This interleaves content from different sections, producing garbled output.
For example, if your left column contains your work experience and your right column contains your education, the parser might merge a job title from the left column with a degree from the right column into a single, incomprehensible line.
The fix: Use a single-column layout where all content flows from top to bottom in the correct reading order. For a detailed comparison, see our guide on one-column vs. two-column resumes.
Mistake 8: Missing a Dedicated Skills Section
Some candidates list their skills only within their experience bullet points, without a dedicated Skills or Technical Skills section. While experience bullets are important for context, a dedicated skills section serves as an explicit keyword index that the ATS can process efficiently.
Without a dedicated skills section, the parser must infer your skills from your prose. More sophisticated parsers can do this, but simpler ones may miss skills that are not explicitly listed.
The fix: Include a clearly labeled “Skills” or “Technical Skills” section that explicitly lists your technical and professional skills. Group them by category for both ATS and human readability.
Mistake 9: Inconsistent Date Formatting
When your resume uses different date formats in different places (“Jan 2024” in one entry, “01/2024” in another, and “2024” in a third), the parser may fail to extract some dates correctly. This affects the ATS’s ability to calculate your years of experience, which is often used as a filtering criterion.
The fix: Pick one date format and use it consistently throughout your resume. “Jan 2024 - Present” or “January 2024 - Present” are both clear and universally parseable. Always include both month and year.
Mistake 10: Using Unusual Fonts and Special Characters
Decorative fonts, custom fonts, and special characters can cause encoding issues during parsing. When the parser encounters a character it does not recognize, it may substitute a question mark, drop the character, or misinterpret it entirely. This can corrupt your job titles, skills, or contact information.
The fix: Use standard system fonts: Calibri, Arial, Garamond, Times New Roman, Georgia, or Cambria. Avoid special characters, decorative bullets, and uncommon symbols. Use standard round or square bullet points for lists.
Mistake 11: Writing Vague, Unquantified Bullet Points
While this is more of a content issue than an ATS issue, vague bullet points hurt you at both stages. The ATS may not find relevant keywords in generic descriptions, and the recruiter who reviews your resume after the ATS will not be impressed by statements like “Responsible for various projects” or “Helped the team succeed.”
The fix: Write specific, quantified bullet points that include relevant keywords. Instead of “Worked on backend projects,” write “Designed and deployed 5 microservices using Go and gRPC, reducing average API latency from 450ms to 120ms.” This version includes keywords (microservices, Go, gRPC, API) and quantified results (5 services, latency reduction).
Mistake 12: Keyword Stuffing
In an attempt to maximize ATS scores, some candidates stuff their resume with every keyword from the job description, often in a hidden white-text section, through excessive repetition, or by listing skills they do not actually have.
Modern ATS platforms can detect keyword stuffing through techniques like analyzing keyword density and distribution. And even if the ATS does not catch it, the recruiter will. A resume that lists “Python” seventeen times or includes a hidden text block will be immediately rejected.
The fix: Use keywords naturally within genuine descriptions of your experience. Each keyword should appear in a context that demonstrates real competence. If you know Python, describe a project where you used Python. Do not just list it repeatedly.
Mistake 13: Making the Resume Too Long
While ATS systems can technically process documents of any length, excessively long resumes dilute your keyword density and reduce the impact of your most relevant qualifications. More importantly, recruiters do not read past the second page for the vast majority of candidates.
The fix: Keep your resume to one page if you have less than 10 years of experience, two pages if you have more. Focus on your most recent and relevant experience. Remove dated skills and old positions that do not support your current job targets.
Mistake 14: Omitting Both Acronyms and Full Terms
If the job description says “AWS” and your resume says “Amazon Web Services,” or vice versa, some ATS platforms will not recognize the match. Different recruiters configure their searches differently, and simpler ATS platforms may not have comprehensive normalization databases.
The fix: Include both forms the first time you mention a term: “Amazon Web Services (AWS),” “Continuous Integration/Continuous Deployment (CI/CD),” “Machine Learning (ML).” After the first mention, you can use either form.
Mistake 15: Not Testing Before Submitting
Perhaps the most avoidable mistake of all: not testing your resume before submitting it. A five-minute test can reveal parsing failures, missing keywords, and formatting issues that would otherwise cost you the opportunity.
The fix: Before every application, test your resume. At minimum, paste it into a plain text editor and check that everything appears correctly. For a thorough check, use an ATS resume checker. Our ATS resume checker guide reviews the best tools for this purpose.
Starting with the Right Foundation
Most of these mistakes can be prevented by starting with an ATS-optimized template rather than trying to retrofit a poorly formatted resume after the fact. Our templates page offers several options that are pre-tested for ATS compatibility across all major platforms. The CS Resume Template is specifically designed for technical professionals and handles all the formatting requirements outlined above.
The Cost of These Mistakes
Every ATS mistake you make is not just a formatting error. It is a missed opportunity. Each garbled parse, each missing keyword, each unreadable section represents a job application that consumed your time and effort but never had a chance of succeeding.
The good news is that every mistake on this list is fixable. Most take less than five minutes to correct. Run through this list with your current resume, fix what needs fixing, and confirm the results with an ATS checker. That investment of time will pay for itself with the very next application you submit.