If you're asking this question, you've probably sent applications into the void and suspect software is screening you out. Here's the honest answer: an ATS almost never "rejects" a resume by itself. What it does is parse your resume into a database — and if the parsing goes badly or your keywords don't match, you rank low in every recruiter search and no human ever opens your file. The effect feels identical to rejection.
So "passing the ATS" really means two things: your resume parses cleanly, and it contains the terms recruiters search. Both are checkable in about a minute, below.
When you apply, the ATS extracts your text and tries to slot it into fields: name, employers, titles, dates, skills, education. Recruiters then search and filter that database rather than reading applications one at a time. You "fail" in one of two quiet ways: the parser mangles your layout (so your last three years of experience land in the wrong field or vanish), or your resume is parsed fine but simply doesn't contain the words being searched.
That's why instant automated rejections usually aren't the ATS scoring your resume at all — they're knockout questions (work authorization, location, license requirements) answered during the application.
First, the parse test: select all the text in your PDF and paste it into a plain-text editor. If what comes out is jumbled — columns interleaved, headings separated from their sections, bullets turned into symbols — an ATS will struggle the same way. Second, the keyword test: put your resume and a real job description side by side and count how many of the posting's hard skills, tools, and title words literally appear in your text.
Or let the checker do both at once: paste your resume (and optionally the job description) for a score, your missing keywords, and the formatting issues to fix.
A handful of choices cause most parsing failures: tables and text boxes (contents get scrambled or skipped), two-column layouts (read straight across), headers and footers (many parsers ignore them — never put contact info there), images and icons (invisible to the parser), and non-standard section headings the software can't categorize. Ornate fonts and graphics-heavy templates from design marketplaces are the most common culprits. A clean single-column document with standard headings passes parsing essentially every time.
Paste your resume — and the job description if you have one — and get an instant ATS score with the exact keywords you're missing and what to fix first.
Check your resume free — no sign-up, instant score →Rarely. Auto-rejection almost always comes from knockout questions in the application (work authorization, location, required licenses) — not from the resume itself. The real risk is invisibility: a poorly parsed or keyword-poor resume ranks at the bottom of every recruiter search and never gets opened.
On this checker, 80+ means you're in strong shape; 60–79 means apply after addressing the top issues; below 60 means fixing the flagged problems is worth an hour before you send anything. No score guarantees an interview — it measures parseability and keyword match, which is what the software layer controls.
Follow the posting if it specifies. Otherwise a text-based PDF is safe with modern systems and preserves your layout. The rule that matters more than file type: simple, single-column formatting. A clean PDF beats an over-designed DOCX every time.
That speed points to knockout questions, not resume screening — something in your answers (location, authorization, salary, a required credential) triggered an automatic no. Re-read the application questions on your next few submissions before rewriting your resume.