An Applicant Tracking System (ATS) is the first gatekeeper between your resume and a hiring manager. According to Jobscan, over 75% of resumes are rejected by ATS before a human ever reviews them. The good news: optimizing your resume for ATS is a learnable skill, and the strategies below will dramatically increase your pass-through rate.
What Is an ATS and How Does It Work?
An ATS parses your resume into structured data, then scores it against the job description's requirements. The system extracts your contact information, work history, education, and skills, then matches them against the employer's criteria. Resumes that score above the threshold move to human review; those below are filtered out.
10 Proven ATS Optimization Strategies
1. Use a Single-Column Layout
Multi-column layouts confuse ATS parsers. Stick to a clean, single-column format with clear section breaks. According to a 2025 TopResume study, single-column resumes have a 40% higher ATS pass-through rate than two-column designs.
2. Choose ATS-Safe Fonts
Use standard fonts: Calibri, Arial, Helvetica, or Times New Roman at 10-12pt for body text. Decorative or script fonts can cause parsing errors that result in your resume being misread or rejected entirely.
3. Match Job Description Keywords
The single most impactful optimization is strategic keyword placement from the job description. Tools like HireKit's AI alignment scoring identify exactly which keywords are missing and where to place them naturally.
4. Use Standard Section Headers
ATS systems look for specific section titles. Use these exact headers: Professional Summary, Work Experience, Education, Skills, and Certifications. Creative alternatives like "Career Journey" or "Toolbox" will confuse the parser.
Check Your Resume's ATS Score
HireKit's AI analyzes your resume against any job description in seconds, scoring alignment across 6 dimensions and suggesting specific improvements.
Try Free for 7 Days →5. Submit in DOCX Format When Possible
While PDF works for most modern ATS, DOCX has the highest compatibility rate across all systems. When a job posting doesn't specify a format, DOCX is the safest choice. Learn more in our complete resume formatting guide.
For a comprehensive deep-dive into every aspect of resume writing, see our complete resume optimization guide which covers everything from keyword strategy to formatting across all major ATS platforms.
HireKit Team
Career Technology Experts
The HireKit team combines expertise in AI, career coaching, and HR technology to help job seekers land their next role faster. Our content is informed by analysis of thousands of resumes, job descriptions, and hiring outcomes.
Frequently Asked Questions
What is an ATS and why does it matter for your resume?
An Applicant Tracking System (ATS) is software used by 99% of Fortune 500 companies and 75% of all employers to screen resumes before a human ever sees them. If your resume isn't ATS-optimized, it may be automatically rejected regardless of your qualifications.
What resume format works best for ATS?
A single-column layout in DOCX or PDF format works best for ATS. Use standard section headers (Professional Summary, Work Experience, Education, Skills), Calibri or Arial 11pt font, and avoid tables, columns, headers/footers, and graphics that ATS cannot parse.
How many keywords should I include in my resume?
Include 15-25 relevant keywords from the job description, distributed naturally across your Professional Summary, Work Experience, and Skills sections. Focus on hard skills, tools, certifications, and industry-specific terminology. Avoid keyword stuffing — each keyword should appear in a meaningful context.
Can AI tools help optimize my resume for ATS?
Yes. AI-powered tools like HireKit analyze job descriptions and your resume side-by-side, scoring alignment across 6 dimensions: skills match, experience relevance, keyword coverage, formatting compliance, certifications, and education fit. This gives you a data-driven optimization strategy.
Should I use a different resume for every job application?
Yes, tailoring your resume for each job application significantly improves your chances. At minimum, adjust your Professional Summary and Skills section to match the specific job description's keywords and requirements. HireKit's AI can generate tailored versions automatically.
Related Guides
- Complete Resume Optimization Guide — Master every aspect of resume writing
- Resume Keywords Strategy — How to find and place the right keywords
- How to Tailor Your Resume for Each Job — Customize efficiently without starting over
- How ATS Systems Actually Work — Deep dive into ATS parsing and scoring