What counts as a resume red flag?
A resume red flag is anything that makes a reader doubt your care, your honesty or your fit before they reach your experience. Some are small, like a typo. Others raise a question the resume never answers, like a gap with no dates around it. Each one gives a busy reader a reason to move to the next file.
The lists below come from published guidance, not from surveys of recruiter behaviour. Career centres, a federal department, a human rights commission and an applicant tracking system vendor each say what they look for or what goes wrong. Where they agree, the warning is worth acting on.
This page leaves out claims about how many seconds a recruiter spends on a resume. Those figures usually trace back to job-site studies, and none was checked for this page. What matters more is whether the details you show hold up when someone does read closely.
Which resume mistakes do career centres list most often?
Spelling errors, missing contact details, vague duties with no results and a layout that is hard to skim show up on almost every list. Harvard and Palm Beach State College both name spelling and grammar errors, and both warn about resumes that list tasks without showing what came of them.
The Harvard College guide to creating a strong resume lists its top five mistakes as "Spelling and grammar errors," "Missing email and phone information," "Using passive language instead of 'action' words," "Not well organized, concise, or easy to skim" and "Not demonstrating results." Its list of things to avoid adds personal pronouns, slang, abbreviations and a narrative style.
Palm Beach State College's list of resume problems is longer. It includes "Missing dates or inaccurate information," "Unprofessional e-mail address," "Long, dense paragraphs; not using bullet points" and "Changing font style throughout the resume." It also lists "Lying and misleading information" and "Unexplained gaps in employment."
The fix for most of these is a slow read. Print the resume or read it aloud, check every date and every name, and send it from an email address that uses your name. The guide to resume bullet points shows how to turn a duty into a result.
Is an employment gap a red flag?
To some readers, yes, and an explanation helps. A 2019 SHRM article says many recruiters consider significant gaps "a bad sign." The same article reports a ResumeGo field experiment in which applicants who explained a gap got close to 60 percent more interviews than those who left it blank.
The SHRM article, How to Evaluate Resume Employment Gaps by Roy Maurer, quotes an AARP recruiter on timing. A gap from years ago matters little, he says, "if someone is currently in a multiyear gap, I think it's reasonable to ask about it." Another recruiter in the piece says a brief, factual explanation is enough.
So give the gap a line with dates and a reason. Keep it short and avoid apologising. Here is an example, made up for this page:
Career break, March 2024 to January 2025: full-time care for a family member; completed the Google Data Analytics certificate in 2024.
The page on explaining a resume gap has more wording for different reasons. When the gap comes up in the interview, the guide to explaining an employment gap in an interview gives a short spoken answer.
Which personal details should you leave off?
Leave off your photo, age, date of birth, marital status and identity numbers. Harvard's guide says not to "Include a picture" or "Include age or gender." The US Treasury's federal resume tips say to leave out a Social Security Number, photos and details such as age, sex or religious affiliation.
In Canada, the same details are ones employers are told not to ask for. The Ontario Human Rights Commission's guidance on designing application forms says "employers should not request photos of potential employees" and should not ask for a date of birth. It adds that "No questions about marital status are permitted."
Putting those details on your resume hands the reader information they are told not to use. It also takes space from your work. Your name, city, phone, email and a LinkedIn link are enough at the top. The guide to the Canadian resume format covers the other conventions north of the border.
Can the layout itself be a red flag?
Yes, when software can't read it. Greenhouse, an applicant tracking system, says its parser struggles with columns, graphics, photos, tables, and contact details placed in a header, footer or text box. A resume that parses badly can reach the recruiter with jobs, dates or your name in the wrong fields.
Greenhouse's page on unsuccessful resume parsing, last updated March 2, 2026, also lists "Resumes with incomplete job titles," with the example "Sr. Account Exec instead of Senior Account Executive." It says the parser can't read resumes larger than 2.5MB, which a file full of high-quality images can exceed.
A clean layout fixes all of this: one column, plain headings, contact details in the body and a .docx or text-based PDF. The page on ATS-friendly resume format lists the rules vendors publish, and the guide to how applicant tracking systems work explains what happens after you click submit.
How long is too long for a resume?
It depends on the employer and your experience, and some employers set a hard limit. The US Treasury's resume tips say "Your resume must be two pages or less and explain why you are qualified for the job." The same page says USAJOBS won't accept a longer resume.
Palm Beach State College lists "Resumes over two pages for experienced job seekers or one page for job seekers with little related experience" as a problem. Harvard sets no page count. It warns against a resume that is not concise or easy to skim.
If you are over the limit, cut the oldest and least relevant roles first. The guide on one page vs two page resumes and the page on how far back a resume should go help you decide what stays.
Which red flags matter most, and how do you fix them?
The ones that make a reader doubt your honesty matter most, followed by the ones that hide your experience. A typo is easy to forgive once. A date that doesn't match LinkedIn, or a claim you can't explain in the interview, is harder. The table sorts the common flags by source and fix.
| Red flag | Who lists it | The fix |
|---|---|---|
| Spelling and grammar errors | Harvard, Palm Beach State, US Treasury | Read it aloud and ask someone else to check |
| Missing email or phone | Harvard | Put your name, city, phone and email in the body, at the top |
| Missing dates or inaccurate information | Palm Beach State | Give month and year for every role and check them against LinkedIn |
| Unexplained gap | Palm Beach State, SHRM article | One line with dates and a short reason |
| Duties with no results | Harvard, Palm Beach State | Add what changed because of your work |
| Photo, age or date of birth | Harvard, US Treasury, Ontario Human Rights Commission | Remove them |
| Columns, graphics or contact details in a header | Greenhouse | One column, plain text, contact details in the body |
| Over the page limit | US Treasury, Palm Beach State | Cut old and unrelated roles first |
| Lying or misleading information | Palm Beach State | Keep every claim to facts you can explain |
The last row matters most in an interview. Interviewers often ask about a line on your resume, and an inflated title or number tends to come apart under two follow-up questions. The page on how to tailor a resume without lying shows how to match a posting with true facts.
How do you check your resume before you send it?
Run a short check against the posting and against the list above. Read the resume once for errors, once for dates and once for results. Then compare it with the job description, since the Treasury page also asks whether you have "addressed all the qualifications listed on the job announcement."
- Read it aloud, slowly, and fix every typo and inconsistent format.
- Check that every role has a start and end month and year.
- Give any gap longer than a few months its own line with a reason.
- Remove any photo, date of birth, marital status or ID number.
- Move your contact details out of the header and into the body.
- Make sure each recent role has at least one result, not only duties.
- Check every number and title against what you could explain in an interview.
The free resume optimizer rewrites the lines that matter for a job while keeping your facts. The free job match tool checks every requirement against your resume and gives a score out of 10. Prept also writes tailored resumes only from facts you confirmed, so nothing appears that you can't explain.
When the interview comes, expect questions about the parts of your history a reader might flag. The guide to answering why are you leaving your current job helps with the question that usually follows a short stint or a gap.