How to Write a Cover Letter That Says Something
Most cover letters fail in their first three sentences, and they fail the same way: they could have been written by any applicant for any job at any company. This guide covers the four paragraphs, the one story worth telling in them, the format nobody notices when you get it right, and the applications where a letter is your evening spent badly.
When a letter earns its half hour
The honest answer to whether recruiters read cover letters is that it depends on the company, and that nobody has a number worth repeating. At a twelve-person firm the person opening your application is often the person you would report to, and they read everything. At a large employer with a structured process, the letter may sit unopened in the system until a shortlist exists, and then be read closely by the hiring manager deciding between four people. Anyone who tells you a precise percentage is quoting a survey they did not read.
That uncertainty has a practical shape. The letter is asymmetric: a specific one can move a borderline application onto the shortlist, and a generic one is neutral at best, so the cost of writing badly is your time rather than your candidacy. Which means the real decision is not whether to write a letter but which applications deserve one, because thirty identical letters are worth less than eight written for jobs you actually want.
Applications where the letter does real work
A career change, an employment gap, a relocation, a title that undersells the job, an unusual path into the field, a small team, or any role where writing is part of the work. In all of these the resume raises a question that only prose can answer, and leaving it unanswered means somebody else answers it for you.
Applications where it is time spent badly
High-volume postings where the form asks for nothing but a file, roles you are applying to in bulk, and any application where you have nothing specific to say about the employer. A letter assembled from adjectives costs you an hour and adds nothing that the resume did not already carry.
When the upload field says optional
Treat optional as a genuine invitation rather than a trap. Attach one when you have something the resume cannot say, and skip it when you would only be restating your work history in paragraphs. The field being optional is not evidence that the letter goes unread by the person who ultimately decides.
The four paragraphs
A cover letter has one job: to make a specific claim about your fit and support it with one piece of evidence the reader can check against your resume. Four paragraphs is enough room for that, and more than four is usually a sign that a second story crept in.
Paragraph one: the claim
Name the role, then say the thing that makes you worth reading for it - the scale you have operated at, the result you are known for, or the specific overlap between this job and your last one. Two or three sentences. If the paragraph would survive being pasted into a different application, it is not finished.
Paragraph two: the one story
The center of the letter and the only part the reader will remember. One project, told end to end: what the situation was, what you decided, what you did, and what changed as a result, with a number if the work produced one. Five or six sentences is normal here.
Paragraph three: why this employer
Something true about this company that connects to the story you just told - a product decision, a market they are moving into, a public engineering post, the way the team is structured. Two or three sentences, and it must be a sentence no other company could receive unchanged.
Paragraph four: the close
Thank them, offer the next step, and stop. Two sentences. The close is where letters go soft with apologies, superlatives, and promises about how perfect a fit you would be, none of which add information the first three paragraphs did not already establish.
How to open without wasting the paragraph
The advice you have read is to never begin with I am writing to apply. The more useful version is that the clause itself is harmless - it names the role, which the reader needs - and the failure is a whole opening paragraph made of it, padded out with how excited you are and where you saw the posting. What matters is what the second sentence does.
Look at how the letters in our own example library handle it. The sales representative letter names the role in the first clause and then earns the paragraph immediately: "Sales letters should lead with numbers, so here are mine: 118 percent of quota last year, 109 percent the year before, and the top prospector on a team of nine for six of the last eight quarters." The graphic designer letter does the same trick differently, dividing the labor between the portfolio and the page: "My portfolio at [portfolio URL] will show you how I design; this letter is about how I work."
Both openings pass the test that matters. Take the company name out and the sentence still belongs to one candidate and no other. Compare that with an opening built on enthusiasm, which reads identically no matter who signs it and tells the reader only that you would like the job - something they had already inferred from the application.
Choosing the one story you are going to tell
Most weak letters are weak because they contain four stories at a paragraph each. Picking one is the hardest decision in the process and the one that decides whether the letter is memorable, so make it deliberately rather than reaching for whatever is most recent.
Answer the hardest requirement in the posting
Read the job description and find the requirement you are least obviously qualified for, or the one repeated in two different sections. That is the doubt in the reader's mind, and the story that answers it is worth more than the story that confirms something your resume already proved.
Pick work you can tell end to end
The story needs a beginning, a decision that was yours, and an outcome. If any of the three is missing you will fill the gap with adjectives. A modest project told completely is stronger than a prestigious one you can only describe from the outside.
Prefer the story with a number in it
Not because numbers impress, but because they end arguments. A retention lift, a resolution time, a budget, a headcount, a launch date held - any of these convert a claim into something the reader can picture and ask about in an interview.
Keep the mistake in if it belongs there
The most persuasive letters often mention what went wrong and what the writer learned, because a candidate who can describe a failure accurately is a candidate who understands the work. Keep it to one clause and never make it the point of the paragraph.
The letter does not repeat the resume
This is the rule that separates a letter worth reading from a letter that wastes the reader's second minute. The two documents are read together, usually within a minute of each other, so anything you copy from one to the other is read twice and counts once. If a sentence in your letter is a bullet from your resume rewritten in full sentences, delete it.
What the resume cannot do is explain. It shows that you moved from teaching to data analysis; it cannot say why, or what transferred. It shows a fourteen-month gap; it cannot tell the reader what you did with it. It shows the churn project; it cannot describe the moment you realized the number was hiding a pattern, or why you took the finding to product leadership rather than filing it in a dashboard. Reasoning, judgment, and context are the letter's territory, and nothing else is.
The practical test takes ten seconds. Put the two documents side by side and highlight every fact that appears in both. If the letter is mostly highlighted, you have written a summary rather than a letter, and the fix is to throw out everything highlighted and build the paragraphs from what is left.
Length, format, and the header
Aim for 250 to 400 words on a single page, in three or four paragraphs. Shorter is fine and frequently better; longer is read diagonally, which defeats the purpose of writing it. Use the same font, the same name block, and the same contact details as your resume, so the two files arrive looking like one document from one person.
Address it to a person if the posting, the team page, or the recruiter's own message gives you a name, and to Dear Hiring Manager if it does not. Do not write To Whom It May Concern, and do not guess at a name you are not sure of. The dated business header with the company's postal address belongs on a printed letter and is optional in every online application - keeping it costs nothing, dropping it costs nothing either.
Send a PDF unless the employer asks for something else, name the file with your own name and the role, and keep it text rather than an image so that whatever the employer stores it in can read it - the same constraints that apply to the resume itself. When the application is an email rather than a form, the letter is the body of the email, not an attachment to a blank message.
Questions people ask
Do recruiters actually read cover letters?
Some do, some never open them, and it varies by company, by team, and by how many applications a posting attracted. Nobody has a reliable number, and none of the widely quoted percentages comes with a source anyone can check. Write one where it can do work, and treat the question as unanswerable in general.
How long should a cover letter be?
Between 250 and 400 words, on one page, in three or four paragraphs. That is enough for a claim, one story with an outcome, a sentence about the employer, and a short close. If yours runs longer, the usual cause is a second story competing with the first rather than a first story told too well.
Who do I address it to when no name is given?
Dear Hiring Manager, which is neutral and correct. Check the job posting, the company team page, and the message from whoever contacted you first, because a real name is worth the two minutes of searching. Avoid To Whom It May Concern, avoid Dear Sir or Madam, and never guess at a name you are not certain of.
Should I send a letter when the field says optional?
Send one when you have something specific the resume cannot carry - a career change, a gap, a relocation, or knowledge of this particular employer. Skip it when the letter would only restate your work history in paragraphs. Optional means the application is complete without it, not that nobody will read it.
Can I reuse the same cover letter for several jobs?
You can reuse the structure and the story, and you will, because you only have so many good stories. What cannot be reused is the paragraph about the employer and the opening claim, both of which must be written for the specific posting. A reader recognizes a recycled letter by how well it fits nothing.
What do I write if I have no experience in the field?
Write about the closest real thing you have done and be explicit about what transfers. Coursework, volunteering, a family business, a side project, or a job in another industry all supply evidence of how you work. The letter is the one place where you can make that connection for the reader instead of hoping they make it.
Keep going
Write the letter next to the job you are applying for.
Start from a structure that already has the four paragraphs, keep your details in one place, and export a matching PDF.