You spent an hour writing your resume. You applied to 30 jobs. You got zero callbacks.
Sound familiar? If so, the problem might not be your experience. It might be your resume's formatting, structure, or keyword strategy. Applicant tracking systems reject resumes for reasons most people never think about, and the fixes are usually straightforward once you know what to look for.
A 2021 study from Harvard Business School and Accenture found that automated hiring systems, including ATS software, regularly filter out qualified candidates. Their research showed that more than 90% of large employers use ATS to screen resumes, and the systems routinely reject candidates who could do the job well (Harvard Business School and Accenture, 2021).
Here are the seven most common mistakes that cause ATS rejections, along with specific fixes for each.
1. Using tables, columns, or text boxes
This is the single most common ATS formatting mistake. Many resume templates (especially ones from Canva or other design tools) use two-column layouts, tables, or text boxes to organize information. They look great on screen. But most ATS parsers read content linearly, from top to bottom and left to right. When they encounter a table or multi-column layout, they often scramble the content, merge cells together, or skip sections entirely.
A 2023 analysis by TopResume found that multi-column resumes were 2.5x more likely to have parsing errors in ATS systems compared to single-column formats (TopResume).
What happens: Your two-column layout puts "Python" next to "Marketing Manager" in the parser's output. Your carefully organized skills section becomes an unreadable string of text.
The fix: Use a single-column layout. Put all content in a linear flow. If you want visual structure, use bold headings, horizontal lines, and bullet points. These are ATS-safe and still look professional.
2. Non-standard section headers
ATS parsers are trained to recognize standard resume sections: "Work Experience," "Education," "Skills," "Professional Summary," "Certifications." When you get creative with headers, the parser may not categorize your content correctly.
Examples of headers that confuse ATS:
- "Where I've Made an Impact" instead of "Experience"
- "My Toolbox" instead of "Skills"
- "The Journey So Far" instead of "Work History"
- "What I Bring" instead of "Summary"
The fix: Stick with conventional section names. You can still make your resume stand out through the quality of your content. The headers are there for the parser, not for creative expression. Good options include:
- Professional Summary or Summary
- Work Experience or Experience
- Education
- Skills or Technical Skills
- Certifications
- Projects
3. Burying skills in paragraph text
Some people write their experience sections as dense paragraphs. This makes it harder for both ATS parsers and human recruiters to find specific keywords.
Before (paragraph format): "I was responsible for managing a team of engineers while also handling data analysis using Python and SQL. I also worked with cross-functional teams to define product requirements and conducted user research to inform design decisions."
After (bullet point format):
- Managed a team of 6 engineers across 3 product workstreams
- Built data pipelines and automated reporting using Python and SQL, reducing manual analysis time by 8 hours per week
- Conducted 40+ user research interviews to inform product roadmap decisions
The bullet-point version is easier to scan, more specific, and makes each keyword individually identifiable to the ATS parser. According to a 2022 eye-tracking study by Ladders, recruiters spend an average of 7.4 seconds on an initial resume scan (Ladders). Bullet points help them find what they need in that short window.
The fix: Use bullet points for every experience entry. Start each bullet with a strong action verb. Include measurable results where possible.
4. Submitting PDF when the ATS prefers DOCX
This one is tricky because the advice varies. PDFs preserve formatting perfectly, which makes them popular with job seekers. But some older ATS platforms (particularly Taleo and older versions of Workday) have historically had trouble parsing certain types of PDFs, especially those created from design tools or exported as image-based files.
A 2020 analysis by Jobscan found that while most modern ATS platforms can handle text-based PDFs fine, DOCX files had consistently better parsing accuracy across all systems tested (Jobscan).
The nuance:
- Text-based PDFs (exported from Word, Google Docs, or LaTeX) usually parse well in modern ATS
- Image-based PDFs (exported from Canva, Photoshop, or scanned documents) will often fail completely
- DOCX is the safest choice if you are not sure which ATS the company uses
The fix: When a job posting specifies a format, follow it. When it does not specify, submit a DOCX file. If you strongly prefer PDF, make sure it is text-based (you should be able to select and copy text from it). Keep a DOCX version of your resume ready at all times.
5. Missing the exact job title
ATS platforms often give extra weight to job title matches. If the posting is for a "Digital Marketing Manager" and your resume says "Marketing Specialist" or "Growth Lead," you are starting at a disadvantage, even if your actual responsibilities were identical.
This does not mean you should fabricate titles. If your official title was "Marketing Specialist," keep it. But there are honest ways to close the gap:
Option 1: Add context in parentheses "Marketing Specialist (Digital Marketing Manager responsibilities)"
Option 2: Use the target title in your summary "Digital marketing professional with 5 years of experience managing paid campaigns, SEO strategy, and content marketing programs."
Option 3: Mirror the language in your bullet points Instead of "handled marketing tasks," write "managed digital marketing campaigns across Google Ads, Meta, and LinkedIn."
The fix: Read the job title carefully. If your experience matches but your title does not, find honest ways to include the target keywords in your summary or bullet points. Never invent a title you did not hold.
6. Keyword stuffing
Some job seekers go too far in the other direction. They copy every keyword from the job description and paste them into their resume, sometimes in white text hidden at the bottom of the page. This is keyword stuffing, and it backfires in two ways.
First, many modern ATS platforms can detect hidden text and white-text tricks. Greenhouse and Lever, for example, strip formatting and render all text as plain text during parsing, which means your hidden keyword block becomes visible gibberish.
Second, even if you get past the ATS, a human recruiter will immediately see that your resume does not make sense. Listing 50 skills you do not actually have is a fast way to get rejected at the interview stage, or worse, to get flagged as dishonest.
What keyword stuffing looks like: A skills section listing 40+ technologies, including ones you used once in a tutorial five years ago. A summary that reads like a job description instead of a description of your actual experience.
What genuine keyword optimization looks like: Including the 8 to 12 most relevant skills from the job description in your skills section, and then demonstrating 4 to 5 of those skills with specific examples in your experience section.
The fix: Only include skills you can confidently discuss in an interview. Use keywords naturally within your bullet points. Focus on the top 10 keywords from the job description, not every single term mentioned.
7. Generic buzzwords instead of specific achievements
"Results-driven professional with a proven track record of success in dynamic environments."
That sentence says absolutely nothing. It contains no specific information, no measurable results, and no keywords that an ATS would find useful. Yet some version of it appears on millions of resumes.
ATS scoring rewards specificity. "Managed a $2.4M annual advertising budget across 4 channels" scores better than "managed advertising budgets" because it contains more searchable, specific terms.
Before (generic): "Experienced software engineer with strong problem-solving skills and a passion for building great products."
After (specific): "Software engineer with 6 years of experience building React and Node.js applications. Reduced API response times by 40% at Series B fintech startup. Led migration from monolith to microservices architecture serving 50K daily active users."
The second version is better for both ATS matching and human review. It contains specific technologies (React, Node.js), measurable outcomes (40% reduction), and concrete context (Series B fintech, 50K DAU).
The fix: Replace every generic claim with a specific example. Use numbers, percentages, dollar amounts, team sizes, and timeframes. If you cannot quantify something, describe the scope and impact in concrete terms.
How these mistakes add up
Any single mistake might cost you 5 to 10 points on your ATS match score. But most people make 2 or 3 of them simultaneously. A multi-column layout with non-standard headers and paragraph-style bullet points could easily drop a well-qualified candidate from 85% to 50%, which is the difference between getting an interview and getting filtered out.
The good news: all of these fixes are straightforward. You do not need to be a resume expert. You just need to understand what the software is looking for.
If you want to see exactly how your resume scores against a real job description, try Fitted. It analyzes your resume for keyword matches, formatting issues, and missing skills, then gives you specific suggestions to improve your score. You can also compare how Fitted's approach differs from other tools in our comparison with Jobscan.
Quick checklist before you apply
- Single-column layout with no tables, text boxes, or graphics
- Standard section headers (Experience, Education, Skills)
- Bullet points for all experience entries
- DOCX format (or text-based PDF)
- Job title from the posting appears in your summary or experience
- Top 8 to 12 keywords from the job description are in your resume
- Every bullet point includes a specific achievement or measurable result
- You can discuss every skill listed in an interview
Run through this list before each application. Better yet, let Fitted check it for you automatically. A two-minute review could save you from being silently filtered out of a job you were qualified for.