What is an ATS in simple terms?

An Applicant Tracking System (ATS) is software that companies use to collect, sort, and filter job applications before a recruiter reads any of them. It scans your resume for keywords, parses your work history into structured fields, and often ranks or filters out candidates automatically based on how well the text matches the job posting.

Does a PDF resume work with an ATS?

Yes, as long as it's a text-based PDF (created from a document, not a scanned image) and uses a simple, single-column layout. Most modern ATS platforms parse PDFs correctly. The real risk isn't the file format — it's complex design elements like tables, text boxes, columns, and graphics that confuse the parser regardless of whether the file is a PDF or a Word document.

How do I know if my resume passed an ATS scan?

You can't see the ATS's internal score, but you can test how well it reads your file. Convert your resume to plain text and check whether your job titles, dates, and skills still appear in the right order and without garbled characters. If the text comes out clean and complete, an ATS is very likely to parse it the same way.

Do small companies use an ATS too?

Yes. ATS platforms like Workday, Greenhouse, Lever, and iCIMS are used by companies of every size, not just large corporations, because even a handful of open roles can generate hundreds of applications. If you're applying through an online portal rather than emailing a person directly, there's almost certainly an ATS involved.

What Is an ATS and How Do You Beat It? (Full Guide)

An Applicant Tracking System scans your resume before a human ever sees it. Here's exactly what an ATS checks, why it rejects good candidates, and how to format a resume that gets through — free and in your browser.

You spend hours polishing your resume, hit submit on a job portal, and never hear back — not even a rejection email. Most of the time, the problem isn’t your experience. It’s that an Applicant Tracking System (ATS) never let a human see your resume in the first place.

What an ATS actually does

An ATS is software recruiters use to manage job applications at scale. When you upload your resume to a company’s careers page, it doesn’t go straight to a hiring manager’s inbox. Instead, the ATS:

Parses your file into structured data — pulling out your name, contact info, job titles, dates, education, and skills.
Matches keywords from your resume against the job description (and sometimes against a recruiter’s saved search).
Scores or ranks candidates so recruiters can sort by relevance instead of reading every application.
Stores everything in a searchable database recruiters can filter later.

Popular platforms include Workday, Greenhouse, Lever, iCIMS, Taleo, and BambooHR. Different companies configure them differently, but the core mechanics are the same everywhere.

Why good candidates get filtered out

Most ATS rejections aren’t about qualifications — they’re about formatting. Here’s what commonly breaks the parse:

Multi-column layouts. Some parsers read left-to-right across the whole page, which scrambles a two-column resume into nonsense — mixing your job title from the left column with a bullet point from the right.
Tables and text boxes. Content placed inside a table cell or a floating text box is often skipped entirely by the parser.
Headers and footers. Contact info placed in a document header or footer sometimes never gets extracted.
Images and icons. A phone icon next to your number, or your job history rendered as an image (common with some flashy templates), is invisible text-wise — the ATS sees nothing there.
Unusual section titles. “My Journey” instead of “Work Experience” can confuse keyword matching, since many systems look for standard section headers.
Missing keywords. Even a well-formatted resume gets scored low if it doesn’t use the same terms as the job posting — “project management” vs. “managed projects,” for example.

The frustrating part is that a resume can look great to a human and still score poorly with an ATS, simply because of layout choices made for visual appeal.

How to build an ATS-friendly resume

The safest approach is a clean, single-column layout with standard section headers. If you’re starting from scratch, the Resume Builder generates a resume in this format automatically — no tables, no columns, no icons standing in for text, so there’s nothing for a parser to misread.

If you already have a resume and want to check it, a few concrete steps help:

Use standard headers: “Work Experience,” “Education,” “Skills,” “Summary” — not creative alternatives.
Avoid tables and columns. A single vertical column, top to bottom, parses reliably everywhere.
Spell out abbreviations at least once. Write “Search Engine Optimization (SEO)” so you match both the acronym and the full term.
Mirror the job posting’s language. If the posting says “customer relationship management,” don’t only write “CRM” — include both.
Keep contact info in the main body, not in a header/footer, and never in a text box.

Test your resume the way an ATS reads it

The most reliable way to catch problems before you apply is to see your resume the way a parser sees it: as plain text, stripped of all formatting.

Open your resume with the PDF to Text tool (or convert a Word file to PDF first with the Word to PDF tool if needed).
Read the extracted text top to bottom.
Check that your name, job titles, company names, and dates appear in the correct order, and that nothing from a table or column has been jumbled or dropped.

If the extracted text is clean and complete, a real ATS will almost certainly parse it the same way. If sections are missing or scrambled, that’s exactly what a recruiter’s system will also miss — and it’s a strong signal to simplify your layout before you send it anywhere else.

The bigger picture

An ATS isn’t trying to trick you — it’s a sorting tool built to handle volume, and most of its “rejections” are really parsing failures, not judgments about your career. The fix isn’t gaming the system with keyword stuffing (which can actually hurt readability and get flagged); it’s making sure the format doesn’t get in the way of the content. A clean, single-column resume with the right keywords will pass through almost any ATS and still read well to the human on the other side.

Every tool above runs entirely in your browser — your resume and personal details never get uploaded to a server, which matters given how much personal information a resume contains.