The one-minute test that beats most scoring tools
Open your resume PDF, select all, copy, and paste into any plain text editor. That stripped text is close to what a parser receives. Read it top to bottom and ask three questions. Does the order still make sense? Is every job still attached to its dates? Is your phone number there at all?
Most parsing failures are obvious in that view and invisible in the designed one. A sidebar of skills that looked elegant turns into a column of words wedged between unrelated job entries. A contact block built as an image disappears completely.
What breaks parsing, in rough order of damage
Multi-column layouts do the most harm, because reading order is inferred from position and two columns interleave badly. Text placed in a document header or footer is frequently skipped outright, which is a problem when that is where people put their phone number. Tables merge cells in ways that glue unrelated fields together.
Graphics and icons carry no text at all, so a skills chart contributes nothing. Unusual section names cause quieter failures: a parser looking for "Experience" may not recognise "Where I've Made an Impact". Fonts with broken character maps produce garbled output, which is rare but fatal when it happens.
What does not matter as much as you have been told
Exact keyword density is folklore. So is the idea that a specific file name or a particular font gets you filtered out. The widely repeated claim that these systems auto-reject three quarters of applicants has no traceable source, and it misdescribes what the software does. It stores and searches applications; people do the filtering.
White-text keyword stuffing deserves a specific warning. It survives parsing, which is why the trick spread, but recruiters read resumes in the parsed plain-text view where hidden text is plainly visible. It reads as an attempt to deceive, and it is a faster route to rejection than any layout mistake.
What to do instead
Use one column and conventional headings. Put contact details in the body, never in a header. Give every position a title, an employer, and a date range. Mirror the vocabulary of the posting where it honestly applies to your work, because recruiters search the database with those words.
The builder produces this shape by default and scores the draft against the same checks. It reports what it could extract from an imported file, which doubles as a parsing test on your current resume.