Most resumes are not rejected for lack of merit but for avoidable mistakes. The good part: the mistakes that cause rejections are always the same ones, and every one of them has a concrete fix.
This guide covers the 10 most decisive, ranked by severity: first the ones that eliminate an application on their own, then the ones that subtract until the total adds up to a rejection. For each one, why it matters and how to fix it.
In this guide
Mistakes that reject on their own
The first five allow no compensation: a resume that is excellent in every other respect still fails on any one of them.
1. Typos and spelling errors
The fastest rejection there is: it takes no judgment to spot, it jumps off the page and it contradicts any claim of "attention to detail" the resume itself makes. An example of the effect:
"Responsable for client comunication. Excelent attention to detail."
The fix is about process, not talent: run the spell checker, let the document sit for a day and reread it, and above all have someone else read it before sending.
2. Sending the same generic resume to every posting
A resume without the keywords from the job description ranks low in the automated filter, and a generic profile never answers the recruiter's only question: why this person for this position. The effect shows in the most visible pieces:
| Avoid (generic) | Better (aligned with the posting) |
|---|---|
| Title: Versatile professional with extensive experience | Title: Digital Marketing Analyst (the same one as the posting) |
| Skills: Microsoft Office, social media, customer service | Skills: Google Ads, Meta Ads, GA4 (the ones the posting asks for, in that order) |
The fix takes 10 minutes per application: title aligned with the posting, a summary that mentions what the posting prioritizes and skills reordered with the exact names the job description uses.
3. Incorrect contact information
One wrong digit in the phone number or one wrong letter in the email and the process ends without the candidate ever knowing: a recruiter who cannot reach someone moves on to the next one. It is the cheapest mistake on the list and the one with the worst consequences.
The fix: verify phone and email character by character before every send, email the resume to yourself as a test, and check that the email address is professional (ideally first and last name).
4. Verifiable lies
Dates stretched to cover gaps, inflated degrees, optimistic language levels, job titles that never existed. Everything gets verified: degrees with the school, languages in the first interview, dates with a background check. A detected lie does not cost points; it eliminates the candidate and usually keeps them out of the staffing firm's future searches.
The fix is conceptual: gaps and intermediate levels get explained, not disguised. An honest one-year gap prompts a question in the interview; a false date ends the process.
5. A layout the automated filter cannot read
Most mid-size and large companies use ATS software that extracts the text of the resume before anyone looks at it. Two columns, decorative tables, icons and text inside images produce broken extractions: experience without dates, empty sections. The candidate never learns they were rejected for formatting.
The fix: one column, standard section headings, a normal typeface and no information inside graphics. The details are in the guide on building an ATS-friendly resume, and any specific resume can be checked against a real ATS for free, in a minute.
Mistakes that subtract until they reject
The next five do not eliminate on their own, but each one pushes the resume down the pile. Two or three combined produce the same rejection.
6. Duties instead of achievements
"Responsible for customer service" describes the position, not the person: any other candidate would write the same thing. The experience section becomes interchangeable, and an interchangeable resume gives no reason to pick it.
The fix is to apply the verb + what + result formula to each bullet ("handled 40 inquiries a day and raised CSAT from 3.9 to 4.5"). Any honest number works: volume, frequency, people, time saved.
7. Unjustified length
Three pages for a profile with 5 years of experience communicate that the candidate cannot tell the important from the incidental. They also dilute: the strong achievements get buried among minor courses and old jobs, and the first read lands on filler.
The fix: one page by default, two with more than 10 relevant years. What to cut first is settled in one-page or two-page resume?.
8. A summary made of empty adjectives
"Proactive, dynamic, results-oriented" opens thousands of resumes and offers not one verifiable fact. The recruiter skips it entirely, and the best-placed section in the document gets wasted on noise.
The fix: rewrite the summary with the who + strength with a number + goal formula. Three concrete lines beat five generic ones in any process.
9. Gaps disguised with vague dates
Listing only years ("2021 - 2023") to cover a gap of months, or overlapping dates so a period without work goes unnoticed. Recruiters know the trick, and the resulting suspicion weighs more than the gap it was meant to hide.
The fix: dates with month and year, always. Long gaps get a one-line explanation (school, caregiving, a personal project, travel); short ones need no comment, they are normal in any career.
10. The careless file
`resume_final_v3(2).pdf` as a file name, an editable format that falls apart on another computer, or a Word file with Track Changes still visible. It is the first thing the recruiter sees, before opening the document, and it already communicates sloppiness.
The fix takes a minute: export to PDF (unless the posting asks for another format), name the file `First-Last-Resume.pdf` and open it before sending to confirm it looks the way it should.
How to review a resume before sending it
All 10 mistakes can be caught with a review in order: spell checker and a second reader (mistakes 1 and 3), a comparison against the specific posting (mistake 2), a reread of dates and claims (mistakes 4 and 9), and a check of formatting, length and file name (mistakes 5, 7 and 10).
For the bullets and the summary (mistakes 6 and 8), the reference is the complete guide to writing a resume, and content selection is covered in what to put on a resume. The automatable part is already solved: a free resume analysis detects several of these mistakes and flags what to fix.
The order of correction matters: first mistakes 1 through 5, which reject on their own. There is no point polishing achievement bullets in a resume the automated filter cannot read.
Frequently asked questions
What is the most common resume mistake?
Describing duties instead of achievements: "responsible for sales" instead of "grew sales 20%." It is the most common because it is the most natural thing to write, and it leaves the decisive section of the resume identical to any other candidate's.
Why do recruiters reject a resume without reading it all?
Because the first review lasts between 6 and 8 seconds and looks for reasons to reject, not to dig deeper. Typos, an unreadable layout, excessive length or a generic profile decide in that window, before the merits are ever read.
How can I tell if a resume has ATS formatting problems?
With a direct test: two-column layouts, tables and text inside images usually break automated extraction. Free checkers simulate an ATS read on the actual file and flag which parts are not being read.
Is an employment gap grounds for rejection?
A gap explained honestly usually is not: it is normal in any career. What does cause a rejection is disguising it with vague or overlapping dates, because recruiters spot the tactic and the loss of trust weighs more than the original gap.
How many times should a resume be reviewed before sending?
At least two passes of your own (one right away, another the next day) plus a read by someone else. The outside read is the most cost-effective: the author tends to read what they meant to write, not what they wrote.