The debate comes up constantly. Half of people on job search forums say cover letters are a complete waste of time. The other half says skipping them is a red flag that hurts your chances.
Both camps are treating a context-dependent decision like a universal rule. The honest answer is more boring: it depends, but not randomly.
Here's what actually holds up when you look at how hiring works in practice.
most hiring managers don't read them first
A Robert Half poll found that 90% of executives describe cover letters as "invaluable" for evaluating candidates. But there's a gap between describing something as invaluable in a survey and actually reading it when you're working through 200 applications.
When a recruiter is screening a high-volume role, they're moving fast. Twelve seconds per resume, looking for the right job titles, skills, and keywords. A cover letter sitting in the attachment slot isn't part of that initial pass. It might get read for the finalists. Often it doesn't get read at all.
This isn't a criticism of recruiters. It's just how the workload works at most mid-to-large companies.
when cover letters actually matter
Context changes this significantly.
Small companies and startups are different. A five-person team reviewing applications is going to read everything you send, including your cover letter. When the hiring manager and the interviewer are the same person, they're looking for personality and fit, and a cover letter is one place to show both.
Writing-adjacent roles are another case where the cover letter is basically a required writing sample. Communications, content, PR, copywriting: if your letter is stiff or generic, you've already communicated something about your writing before anyone reads your resume. In these fields, the quality of the letter matters.
If your resume needs context, like a gap, a career change, or applying somewhat outside your experience level, a short honest cover letter that addresses this directly can prevent you from being screened out too early. Hiring managers can't ask you about it until they decide to call, so giving them the context upfront removes a reason to pass.
And if the job posting explicitly asks for one, write one. Skipping an explicit request signals you don't follow directions, which is not the impression anyone is trying to make.
when it probably changes nothing
Apply through a Workday or Greenhouse portal at a large company and your application hits a system designed for keyword filtering. The first processing step is automated scoring against the job description. A cover letter doesn't factor in at that stage.
LinkedIn Easy Apply works the same way. You're one of hundreds of applicants. The recruiter's first look is at your resume, not your intro paragraph.
For most high-volume job board applications, the cover letter at the initial stage is a formality. The decision about whether to move you forward happens before anyone gets to it.
what matters more than the cover letter debate
Here's what gets lost in every cover letter discussion: none of it matters if your resume doesn't clear the ATS filter first.
Over 93% of recruiters use an applicant tracking system to screen resumes before a human sees anything. If your resume doesn't match the keywords in the job posting, the exact title, the specific tools mentioned, the phrases from the requirements section, you can be filtered out before anyone opens your file. The cover letter is never read because the resume didn't pass.
Jobscan research found that when a resume matches the job title keywords specifically, interview rates can improve by up to 10.6x. That's a much bigger lever than any cover letter.
If you're choosing between spending 30 minutes writing a cover letter and spending 10 minutes making sure your resume keywords match the job posting, do the keywords. The ATS gate comes before the human one.
Tools like Breeze Apply handle the keyword-matching automatically, rewriting your summary, skills section, and headline to match each specific job before you apply. That's the step where most people lose applications they never even know about. Once your resume is dialed in per role, you can apply to hundreds of jobs fast without starting over every time.
when you do write one, what should it say
If you're writing a cover letter for a situation where it actually matters, keep it short. Under 250 words is fine. Under 200 is better.
Lead with something specific to this company, not a restatement of your resume. Something from their job posting or their site that made you want to apply. Hiring managers at small companies can tell the difference between a letter written for them and a template with the company name swapped in.
Address any obvious questions your resume raises. If you're switching industries or have a gap, say something honest and move on.
Then stop. The goal of a cover letter is to get them interested enough to read your resume, not to replace it.
the short version
Cover letters matter for small companies, writing roles, and situations where your resume needs context. They're largely irrelevant for high-volume ATS-based applications where the first filter is automated.
In all cases, your resume keywords have to be right first. That's the gate that actually determines whether a human sees your application at all. You can have the best cover letter ever written sitting behind a resume that got filtered out before anyone read it.
For more on what the ATS is actually evaluating, how ATS systems actually rank your resume and resume keywords 101 cover the specifics in detail.