What a cover letter should do that a resume cannot
A resume is a structured list: roles, dates, achievements, skills. A cover letter is the one place in a job application where you get to write in full sentences, connect the dots between your background and this specific role, and show genuine interest in this specific employer rather than a generic interest in being employed. A hiring manager who reads both documents is really asking the cover letter one question the resume cannot answer on its own: why this role, at this company, and why you.
That means a cover letter that simply restates the resume in paragraph form has failed at its one job. It should read as a short, connected argument, not a second copy of the same information in a different format.
Not every application requires a cover letter, and some postings explicitly say one is optional. Where it is requested, or clearly welcome, skipping it can read as a missed opportunity rather than a neutral choice, since it is the one document where you get to explain, in your own words, why you specifically are applying to this specific opening rather than sending out the same resume everywhere.
This is also why a cover letter written well can matter disproportionately for a career change or an unconventional path into a field. A resume shows a work history; it does not, on its own, explain why that history is relevant to a role it does not obviously lead to. A cover letter can make that connection explicit, in a way a resume's format simply is not built to do.
Structure: opening hook, body, close
Most effective cover letters run three to four short paragraphs and fit on a single page. A structure that reliably works:
| Section | What it does | Typical length |
|---|---|---|
| Opening hook | A specific reason for your interest in this role or company, not a generic greeting. | 2 to 3 sentences |
| Body paragraph 1 | The strongest piece of experience directly relevant to what this role needs, with a concrete result. | 3 to 5 sentences |
| Body paragraph 2 (optional) | A second relevant strength or a genuine connection to the company's mission, product, or work. | 3 to 4 sentences |
| Close | A clear, confident call to action: interest in discussing the role further, availability, next step. | 2 to 3 sentences |
The opening hook carries more weight than its length suggests. A hiring manager reading dozens of letters will keep reading past the first few sentences only if those sentences give a real, specific reason to. "I am writing to apply for the marketing coordinator position" is not a hook. A sentence that names something specific about the role or the company, and connects it to something concrete in your background, is.
The second body paragraph, when you include one, is a good place to address anything a hiring manager might otherwise wonder about, a career change, a return from a career break, or relocating for the role, briefly and matter-of-factly, framed around what you bring to the role rather than as an apology. Left unaddressed, these details can sit as a quiet question mark; addressed directly in a sentence or two, they usually stop being a concern at all.
Researching the employer before you write
A cover letter that could be sent to any company with only the name changed is easy to spot, and hiring managers spot it quickly. Genuine interest in a specific employer usually comes from a small amount of real research: reading the actual job posting closely rather than skimming it, looking at what the company has recently launched, published, or announced, and understanding roughly how this role fits into the team or the company's current priorities.
You do not need to praise the company in general terms, calling it innovative or a great place to work says nothing a hiring manager has not already heard. What works is naming something specific: a product, a project, an approach to the work, and connecting it to a specific reason it appeals to you or a specific way your background is relevant to it.
This research also helps with tone. A cover letter to a small, informal startup and a cover letter to a large, established institution can both be professional while sounding noticeably different, and matching that tone, without overdoing it, is itself a small signal that you have paid attention to who you are writing to.
An example: from generic to connected
I am a hard worker with strong communication skills and a passion for customer service. I believe I would be a great fit for this position and would appreciate the opportunity to discuss my qualifications further.
When your team launched the self-serve return portal last spring, our support tickets on that exact issue dropped by roughly a third within a month, which is the kind of problem I spent the last two years solving at a smaller scale for a 12-person retail support team. I would like to bring that same approach, reducing repeat contact through better self-serve tools rather than just answering the same question faster, to your customer experience team.
The first paragraph is a list of qualities anyone could claim about themselves. The second names something the company actually did, connects it to specific relevant experience, and shows the applicant has thought about how their skills apply to this employer's actual work, not employment in general.
Format: matching your resume, staying easy to scan
A cover letter should visually match the resume it accompanies, using the same font, similar margins, and a comparable level of formality, so the two documents read as a single, coordinated application rather than two unrelated files. Keep paragraphs short, generally no more than four or five sentences, since a wall of unbroken text is harder to read quickly than a few clearly separated paragraphs, even at the same total length.
Save the file with a clear, professional file name that includes your name, and submit it in whatever format the application requests, usually a PDF so your formatting displays consistently across different devices and software. A cover letter pasted directly into an online application text box should follow the same structure, even without the visual formatting a file allows.
Salutation and sign-off deserve the same care as the body. "Dear" followed by a name is the safest default; overly casual openings like "Hi there" or overly formal ones can both feel slightly off depending on the industry, so match what is typical for the field you are applying to. Close with a standard professional sign-off, your full name, and, where relevant, a way to reach you beyond what is already on the resume.
Common mistakes that weaken a cover letter
- Restating the resume in paragraph form instead of adding a connected argument the resume cannot make on its own.
- Generic language like "I am a hard worker" or "I am a team player" with no specific evidence behind it.
- Addressing it "To Whom It May Concern" when the hiring manager's name is findable on the job posting, the company site, or a professional network.
- Spending the whole letter on why the role would benefit you, with nothing about what you would bring to the employer.
- Using the same letter for every application with only the company name swapped, which is usually detectable to an attentive reader.
- Ending without a clear next step or a confident closing line, trailing off instead of inviting a conversation.
- Formatting the letter inconsistently with the accompanying resume, or submitting a file format the application did not ask for.
Checklist before you send it
- Confirm it is addressed to a specific name where one is findable, and otherwise to a specific title rather than a generic greeting.
- Check that the opening two sentences give a real, specific reason for interest in this role or company.
- Remove any sentence that only restates a bullet already on the resume with no new detail added.
- Confirm it fits on one page and reads in well under a minute.
- Read it next to the job posting and check that your strongest relevant qualification is clearly visible.
- Confirm the company name and role title are correct throughout, especially if the letter started from an earlier version for a different application.
- Check the closing paragraph names a clear next step rather than trailing off with a passive sign-off.
How ApplicationWriters helps with a cover letter
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