What actually breaks a resume in an ATS, ranked by what it costs
The short answer
Most advice about applicant tracking systems is written from the outside, by people guessing at what the software does. We took a different route: we built a checker, published every rule in it, and put the point value next to each one. There are 21 checks. You can read all of them, and the weight attached to each, on the free ATS checker itself.
That published list doubles as a priority order. If you only have an hour to spend on your resume file, the weights tell you where the hour goes. This post walks that list from the most expensive failure down to the cheapest, and explains what each one actually does to your document once a parser opens it.
One thing to be clear about first, because it is the thing most articles on this subject quietly get wrong. Nobody can simulate a specific employer's system. Every vendor parses differently, and most of the scoring that decides your application happens on the employer's side under rules you will never see. What a checker can verify is the part you control: whether the file parses cleanly, whether the content is complete, and whether your bullets carry evidence. Those things help with every system, which is why they are worth ranking.
The five categories, and what each is worth
The 100 points split five ways.
Parse is worth 35, and it is the heaviest for a reason: it covers whether the software can read your file at all. Evidence is worth 25, and covers whether your bullets say anything a reader can check. Completeness is worth 15, and asks whether the expected pieces are present. Clarity is worth 15, and looks at whether the writing gets out of its own way. Consistency is worth 10, and covers dates and formatting.
Grades sit on top of the score: A+ at 92 or above, A at 85, B at 70, C at 55, D at 40, and F below that.
Notice the shape of it. More than a third of the available points sit on a question that has nothing to do with your career, your writing, or your fit. It is purely about whether the file opens and gives up its text. That is the part of a job search that is most fixable in an afternoon, and the part almost nobody checks.
The two failures that take everything
Two checks are worth 35 points each, more than any other, and they are worth that because both are total.
The first is password protection. If the file is encrypted, a parser gets a locked container and nothing else. It does not partially read a protected file. It reads none of it.
The second is no extractable text. This is the scanned resume, or the resume exported as an image, or the design file that flattened every letter into pixels. To you it looks perfect. To software it is a picture of a resume, which is not a resume.
Both share an unpleasant property: your own copy looks completely fine. You have no way of noticing from the outside, which is exactly why they are worth so much. We wrote about both at length in the two resume files that score zero.
Layout: the ten point question
Multi column layout is a 10 point check. It is a real risk, and it is also the single most exaggerated risk in this whole subject.
The problem is reading order. A parser walks the document in the order the file stores it, which is not always the order your eye sees. A sidebar can end up interleaved with the main body, so your skills land in the middle of a job description and your dates attach to the wrong employer.
But 10 points is 10 points, not 35. A two column resume is not disqualifying, and treating it as though it were is how people throw away a layout that was working for them. The distinction between a layout that survives and one that does not is worth understanding properly, and we lay it out in two column resumes.
Content that lives outside the body
Three checks cover the same underlying problem: content that is technically in the file but not in the document body.
Content inside tables is 8 points. Tables are a layout device, and when a parser flattens one it has to guess whether to read across the row or down the column. Guess wrong and your job title attaches to the wrong dates.
Content inside text boxes is also 8 points. Text boxes float above the document rather than sitting in it, and some parsers skip them entirely, so whatever they hold may never be seen at all.
Contact details in the header or footer is 6 points, and it is the cruelest one on the list. Word headers and footers live outside the document body, and a well known class of parser never reads them. Your name, your email and your phone number can silently vanish while the rest of the resume comes through perfectly. The system then has a complete work history it cannot reply to. We gave that one its own post: where your email silently vanishes.
The small parse checks
Unreadable characters is 8 points. When extracted text comes back with replacement characters in it, the file's font encoding does not map back to real letters. Whole words can be lost, and the ones that survive often arrive with junk fused to them.
Type below 9 points is 4 points. Sub nine point type is rarely a parsing failure on its own. It is a signal, usually of two pages being squeezed into one, and it reads badly for the human who sees the resume after the software does.
Decorative bullet glyphs is 3 points. Stars, arrows and check marks are not in every parser's character map, and when they fail they tend to come through as junk glued to the first word of the line. Both of these, and why they share a cause, are covered in junk characters and decorative bullets.
Evidence: the heaviest thing you actually write
Parse is about the file. Evidence is about the writing, and it is worth 25 points.
Numbers in your bullets is 15 of those, which makes it the heaviest single check outside the two total parse failures. A bullet without a number is a claim. A bullet with one is evidence. It is the highest return edit available to most people, and it is entirely within your control. See numbers in your bullets.
Overlong bullets is 6 points, and enough bullets to judge is 4. Together they describe a shape rather than a rule: enough detail to evaluate, not so much that nobody finishes the sentence.
Completeness, clarity and consistency
Completeness is 15 points across two checks. Core sections is 8, because parsers look for standard section names to know which lines are which. Contact block is 7, because a missing contact field is an empty box a recruiter has to chase.
Clarity is 15 points across four. Filler phrases is 6, and it targets the language that displaces evidence rather than adding it. Length is 4, run on sentences is 3, and summary length is 2.
Consistency is 10 points across three. Date format consistency is 4, readable employment dates is 3, and keyword stuffing is 3.
That last one deserves a note, because it runs against a great deal of published advice. Keyword stuffing is penalised here, not rewarded. Modern screening flags it. A checker that coached you to pack your resume with terms would be optimising for a system that stopped existing some years ago.
What to actually do with this
Work top down. Confirm the file opens and gives up its text, because 70 of the 100 points sit on two checks that most people never think to test. Then move anything load bearing out of headers, footers, tables and text boxes. Then go through your bullets and put a number in the ones that are carrying a claim.
Everything below that is real but small. The order is the point.
If you want the specific findings for your own file rather than the general shape, the free ATS checker runs entirely in your browser, does not upload anything, and shows each finding with the exact line it refers to. The rule set it uses is the same one this post is built from, published in full, which is a claim worth checking rather than taking on faith. When your file is clean, the next question is which jobs are worth sending it to, and that is what ATS application forms actually ask for picks up.
iapplyai.app publishes this entire rule set because a checker that hides its rules is asking to be trusted rather than checked. Run your own file against it on the free ATS checker, fix the findings in weight order, and the same evidence then feeds the scoring that decides which postings are worth your time.
