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What Is an ATS and Why Does It Matter?

An Applicant Tracking System (ATS) is software that companies use to manage job applications at scale. When you submit your resume through an online job portal — whether it's LinkedIn, Indeed, the company's careers page, or any other platform — your resume enters an ATS before any human sees it.

The ATS parses your resume into structured data, extracting your name, contact information, work history, education, and skills. It then compares this data against the job description to calculate a relevance score. Applicants are ranked by this score, and only the top candidates are forwarded to the hiring manager. Everyone else is automatically filtered out.

This means your resume could be perfect for the role, but if the ATS can't parse it correctly — or if it's missing the right keywords — no human will ever read it. Studies estimate that 75% of qualified applicants are rejected by ATS before reaching a recruiter.

The 7 Most Common ATS Failures

• Missing keywords: The job description says "project management" but your resume says "managed projects." ATS looks for exact phrase matches. If the keyword isn't there verbatim, you lose points.
• Non-standard formatting: Two-column layouts, text boxes, headers/footers, and tables confuse ATS parsers. Your carefully designed resume turns into jumbled text on the recruiter's screen.
• Graphics and images: Logos, icons, headshots, skill bars, and infographics are invisible to ATS. Any information conveyed only through graphics is lost.
• Creative section headers: "My Journey" instead of "Work Experience," "Toolkit" instead of "Skills," "Learning" instead of "Education." ATS expects standard headers.
• Wrong file format: Some ATS can't parse certain PDF types (especially those exported from design tools like Canva or Figma). DOCX from Word or Google Docs is the safest format.
• Lack of dates: ATS calculates years of experience from your employment dates. Missing or ambiguous dates (e.g., "2020-present" vs "January 2020 - March 2026") can misrepresent your experience level.
• No quantified achievements: ATS and recruiters both look for numbers. "Increased revenue by 23%" scores higher than "Responsible for increasing revenue."

How Our ATS Checker Works

ApplyGlide's ATS resume checker simulates how real Applicant Tracking Systems evaluate your resume. Here's the process:

• Document parsing: We extract text from your PDF (or use the text you paste directly). This simulates how an ATS would read your file.
• Keyword extraction: We analyze the job description to identify required skills, qualifications, tools, certifications, and experience levels.
• Match analysis: We compare your resume content against the extracted keywords, identifying exact matches, partial matches, and complete gaps.
• Format evaluation: We check for common formatting issues that cause ATS parsing failures.
• Score generation: You receive a score from 0-100 along with specific, actionable recommendations for improvement.

What to Do After Checking Your Score

If your score is below 70, your resume needs optimization before submitting. You have two options:

Option 1: Fix it manually. Use the keyword gaps our checker identifies to update your resume. Add missing keywords to your skills section and bullet points. Simplify your formatting. Use standard section headers. This works but takes time, especially if you're applying to multiple jobs.

Option 2: Rebuild with AI. Use ApplyGlide's AI resume builder to generate a new resume from the same job description. The AI automatically includes all relevant keywords, uses ATS-safe formatting, and produces bullet points that are both machine-readable and compelling to humans. Average score: 87/100.

Major ATS Systems and Their Quirks

Different companies use different ATS platforms, and each has its own parsing behavior. Here are the major players:

• Taleo (Oracle): Used by many Fortune 500 companies. Strict about formatting. Prefers single-column layouts and standard section headers.
• Workday: Growing rapidly. Better at parsing modern PDF formats but still struggles with graphics and multi-column layouts.
• Greenhouse: Popular with startups and tech companies. Relatively forgiving parser, but keyword matching is strict.
• Lever: Common in tech. Clean interface for recruiters. Good at extracting structured data from well-formatted resumes.
• iCIMS: Widely used in healthcare, retail, and large enterprises. Conservative parser that rewards simple formatting.

ApplyGlide's ATS checker evaluates against the common denominators across all these platforms. If your resume scores well on our checker, it will perform well on any ATS.