Cover letters · 7 min read

How to write a cover letter (that someone will actually read)

The honest starting point for any cover letter advice is that most cover letters are never read. Recruiters working through hundreds of applications open the resume first, and for a straightforward application where your experience obviously matches, the letter rarely changes the outcome. Any guide that tells you every application needs a beautifully crafted letter is selling you work you don't need to do.

That said, there are four situations where the letter is genuinely decisive, and in those it is often the single most valuable thing in your application. The first is when the posting explicitly asks for one — skipping it then reads as either careless or as evidence you didn't finish the instructions. The second is when your application raises an obvious question: a career change, an employment gap, a relocation, a step down in seniority. The third is when you're a non-obvious fit whose relevance needs one sentence of explanation. And the fourth is a small company or a role where a named human is doing the hiring, where a specific letter lands very differently from a generic one.

Outside those four cases, spend the time on tailoring your resume instead. A tailored resume with no letter beats a generic resume with a beautiful letter almost every time, because the resume is the document that definitely gets opened.

When you do write one, understand what it is for. The cover letter is not a prose version of your resume — the reader already has the resume and will resent the duplication. It answers three questions the resume structurally cannot: why this specific company, why this role now, and what connects your history to the thing they need done. Everything that doesn't serve one of those three questions can be cut.

The structure that works is four short paragraphs, and short is not a stylistic preference. Aim for 200 to 300 words on a single page with white space. A dense full page signals that you don't know what matters; three tight paragraphs signal that you do. The reader is skimming, and a letter they can absorb in twenty seconds is one they will actually absorb.

The opening paragraph should say what you're applying for and give the single strongest reason you're credible. This is where most letters die. Do not open with “I am writing to apply for the position of X, which I saw advertised on your website” — it uses your best line to convey information the reader already has. Open with the substance instead: “I've spent four years making payment systems reliable at scale, most recently cutting checkout failures by a third at FinPay — which is why the reliability engineer role caught my attention.” One sentence, and you have established relevance and evidence at once.

The second paragraph carries your proof. Pick one achievement — not three — that maps directly onto what the job description says it needs, and tell it with enough specificity that it could not have been written by anyone else. Name the problem, what you actually did, and the result. Numbers help, but a concrete detail works nearly as well: the system you rebuilt, the process you inherited and changed, the thing that was broken when you arrived. Vagueness is what makes letters interchangeable, and interchangeable letters are why recruiters stopped reading them.

The third paragraph answers “why us,” and it is the paragraph that most obviously exposes a mass-produced letter. It requires you to know something real about the company: a product decision, a stated problem, the market they're moving into, something a person there wrote. One genuine sentence beats a paragraph of flattery. “You're expanding into UPI payments this year, which is the exact problem I spent two years on” is persuasive. “I have long admired your commitment to innovation and excellence” is noise, and the reader has seen it two hundred times.

The closing paragraph should be brief and direct: you'd welcome the chance to discuss it, and you're available to talk. Do not be elaborate here, and do not undercut yourself. “I know I don't have all the experience listed, but…” invites the reader to agree with you. If you've decided to apply, apply with a straight back.

If you're changing careers, name the change in the first sentence rather than hoping it slides past. “After five years in clinical research I moved into data analysis, and what carried over is the part this role needs most — designing work that produces trustworthy answers.” Owning the pivot immediately removes it as a distraction and lets the rest of the letter make your case. An unexplained career change makes the reader spend their attention on a puzzle instead of on your evidence.

If you have an employment gap, one clause is enough. “I took a year out for caregiving and returned to contract work last spring” closes the question entirely. The instinct to over-explain is understandable and counterproductive; length signals discomfort, and the reader takes their cue from you. A stated gap is a non-event.

Address it to a person whenever you reasonably can. The hiring manager's name is often findable on the company site or in the posting itself, and it changes the register of the whole letter. When you genuinely can't find it, “Dear Hiring Team” is fine. “To Whom It May Concern” reads as dated, and “Dear Sir or Madam” assumes something you don't know.

There is a specific list of phrases worth deleting on sight, because they appear in nearly every weak letter: “I am writing to express my interest,” “I believe I would be a great fit,” “team player,” “detail-oriented,” “passionate about,” “fast-paced environment,” and “I would welcome the opportunity to leverage my skills.” None of them convey information. The test for any sentence in your letter is whether a different candidate applying for a different job could have written it. If they could, it is doing nothing for you and should go.

On using AI to draft: it is a reasonable starting point and a terrible finishing point. Generated letters have a recognisable register — fluent, evenly weighted, full of confident adjectives and short on specifics — and recruiters have become fast at spotting it. The failure is structural rather than stylistic: a model doesn't know which of your achievements is the relevant one, so it hedges across all of them. Use it to get past the blank page if you like, then replace every general claim with something only you could have written, and read the result aloud. If it doesn't sound like you talking, it won't sound like you to them either.

Format it plainly. Same font as your resume, your contact details at the top, a real signature line, and a PDF unless the application asks otherwise. If you're pasting into a form field, put the content first and drop the letterhead formality — nobody needs a postal address in a text box. Name the file clearly, with your name in it. A file called cover_letter_final_v3.pdf tells the reader something you would rather it didn't.

Before you send, run four checks. Is the company name right — the single most common and most fatal error, and the one that copy-pasting produces? Does every paragraph earn its place against one of the three questions? Have you removed anything a different candidate could have written? Is it under 300 words? That last check does more work than people expect, because cutting to length forces you to keep only the material that was actually persuasive.

A practical question that trips people up: attachment or email body? If you're emailing a person directly, put the letter in the body of the email and attach only the resume. Forcing someone to open a second attachment to learn why you're writing is friction with no benefit, and many recruiters simply won't. If you're using an application form with an upload field, attach a PDF. If the form has a free-text box instead, paste the content and strip the letterhead formality — the date and postal address are vestigial in a text field. Your subject line should be plain and searchable: the role title and your name, nothing clever.

If someone referred you or you have a genuine connection to the company, put it in the first line, because it is the most valuable sentence available to you. “Priya Sharma suggested I get in touch about the reliability role — we worked together on payments at FinPay” outperforms anything else you could write, since it converts you from a stranger into someone with a vouching third party. Only do this with the person's knowledge and agreement. A name-drop that surprises the person named does more harm than the referral would have done good, and it will surface in the very first conversation about your application.

Finally, calibrate the effort to the situation. Twenty minutes on a letter for a role you genuinely want and clearly fit is a good use of time. Twenty minutes each on fifteen letters for roles you half-fit is how a job search consumes an entire week without producing an interview. The letter is a precision instrument, and its value comes almost entirely from being specific to one job — which means it only works if you are writing few enough of them to be specific.

Frequently asked questions

Do I really need a cover letter?

Not for most applications. Write one when the posting asks for it, when your application raises an obvious question like a career change or a gap, when you're a non-obvious fit that needs explaining, or when a named human at a small company is doing the hiring. Otherwise put the time into tailoring your resume.

How long should a cover letter be?

Around 200 to 300 words — four short paragraphs on a single page with white space. The reader is skimming, and a letter that can be absorbed in twenty seconds is one that actually gets absorbed. A dense full page signals you don't know what matters.

How do I start a cover letter?

Not with “I am writing to apply for…”, which spends your strongest line on information the reader already has. Open with your most credible, specific reason for being a fit — a concrete achievement that maps onto what the role needs, in one sentence.

Should I use AI to write my cover letter?

As a first draft only. Generated letters hedge across all your experience instead of picking the relevant piece, which produces the fluent-but-generic register recruiters now recognise. Replace every general claim with something only you could have written, then read it aloud.

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