Free ATS Resume Checker & Optimizer

An ATS resume checker reads your resume the way an applicant tracking system would and scores how well it matches the job description. Resume Optimizer Pro goes further: it automatically fixes the formatting and parsing issues that get resumes filtered out, so you do not have to.

The systems that screen resumes do not run AI detection. They rank your resume on how well your skills and experience match the job. Public AI detectors are unreliable and routinely flag fully human resumes, because resume text is short and formulaic. What matters is whether the right skills appear in the right sections, which is exactly what we optimize. Read more: Will my resume be flagged as AI?

Resume Optimizer Pro is built by former ATS software engineers and uses Sovren and Textkernel parsing standards, the same engines used by major employers. Most free resume checkers use basic keyword matching. Our tool checks actual parsing compatibility, not just word counts, making it a more accurate resume checker than tools that simply count keyword occurrences. See our full comparison of ATS resume checker tools for a side-by-side breakdown.

The checker detects common ATS-breaking issues including: tables and multi-column layouts that scramble content order, graphics and images that are invisible to parsers, non-standard section headers that ATS systems can't categorize, and date formats that fail to parse correctly.

A job description is optional but recommended. Without one, the tool checks formatting and parsing compatibility. With a job description, it also analyzes keyword alignment and gives you a match score specific to that role.

Upload a .docx or .pdf resume file. For best ATS compatibility, we recommend .docx format, as some PDF files (especially those with complex layouts or created from design tools) can cause parsing issues with certain ATS systems.

Seeing what an ATS reads from your resume is free and needs no account. The extracted text comes back on the next screen, held for that session only and never shared or sold. A free account adds the match score against a job description. A paid plan unlocks the optimized resume download, editing, templates, and cover letters.

Upload your resume using the free checker above. We parse it with the same engines that major ATS platforms use and automatically fix any formatting issues: broken layouts, unreadable sections, and non-standard headings. Your match score then shows how well the optimized resume fits the job, and a match score above 70% with no formatting flags means it is ATS-friendly.

Resume Optimizer Pro is built on Sovren and Textkernel parsing standards, which are the foundation for most major ATS platforms including Workday, Greenhouse, Lever, iCIMS, and Taleo. This means the checker accurately represents how the majority of employer ATS systems will read your resume.

Submit as .docx whenever possible. Word documents have the highest parsing success rate across all ATS platforms. PDFs can work, but complex layouts, custom fonts, or design-tool exports often cause parsing failures. If the job posting specifically requests PDF, use a simple, text-based PDF created from Word or Google Docs.

ATS parsers read resume content as a linear text stream. When they encounter a table, they collapse all cells into a single sequence, which scrambles the reading order. A two-column layout showing "Software Engineer | Acme Corp | 2020-2023" becomes a string of disjointed text. The result is a job title matched to the wrong company, missing dates, or content that fails to map to any recognized field. Use a single-column layout with clear section headers instead.

Standard headers that all major ATS platforms recognize: Work Experience, Professional Experience, Employment History, Education, Skills, Technical Skills, Certifications, Summary, and Objective. Creative alternatives like "My Journey," "What I've Built," or "Areas of Expertise" often fail to categorize correctly, leaving the content unattached to any structured field. Stick to conventional header names to ensure your content is classified and scored accurately.