How to Write a Cover Letter That Gets Read (Under 300 Words)

When a letter matters — and when to skip it

Prioritize by expected value. Write a real letter when: the posting asks for one (a compliance test some employers use — skipping it is a silent disqualifier); you're a career changer or have a gap, because the letter is the only document that tells the story in full sentences; you have a referral or genuine company connection to name; the job is one you specifically want; or you're entry-level, where structurally similar resumes make the letter one of the only differentiators available.

Skip or minimize when the application marks it optional at a high-volume employer, or when you're running wide-net applications where those ten minutes are better spent tailoring the resume — the resume is always read first and always matters more.

One rule regardless: never attach a generic letter to look thorough. A visibly templated letter ('your esteemed organization') reads worse than no letter, because it demonstrates exactly the effort level it tried to disguise.

The shape: four short paragraphs, under 300 words

A cover letter is not an essay; it's a structured argument that fits on half a page. The load-bearing version:

1. The hook (2-3 sentences). Name the role, then lead with your single strongest, most relevant fact — a number, a credential, a directly analogous win. Not your feelings about the opportunity.
2. The evidence (the longest paragraph). One or two specific achievements, chosen because they map to this posting's top requirements, with enough mechanism to be believable. This expands your best resume bullets; it never re-lists the resume.
3. The bridge (2-3 sentences). Why this company, concretely — their product, market, stage, or mission, connected to what you bring. One researched sentence beats three flattering ones.
4. The close (1-2 sentences). Restate the fit in one line and ask plainly for the conversation. Sign off; done.

Openings: replace the null first line

'I am writing to apply for…' wastes the only sentence guaranteed to be read — the reader knows what you're writing to do. Open with the strongest true sentence you have:

• The number: 'In three years running support at a 200-store retailer, I cut average ticket resolution from 2 days to 4 hours — the same problem your posting leads with.'
• The referral: 'Maria Chen on your engineering team suggested I apply; we shipped two products together at Datavine.' A named referral is the single strongest opener that exists — use it in sentence one, never paragraph three.
• The direct match: 'You need a CDL-A driver with tanker endorsement and a clean record; I hold both, with 900,000 accident-free miles behind them.'
• The career-change frame: 'After seven years teaching high school math, I've retrained in data analytics — and classroom-tested skills in explaining numbers to skeptical audiences turn out to be the hard part of the job.'

The specificity test

Before sending, run the swap test on every sentence: could this sentence appear, unchanged, in a letter to a different company for a different job? If yes, it's filler — cut it or sharpen it until it couldn't. 'I am a passionate team player with excellent communication skills' fails; 'I presented weekly forecasts to a CFO who hated surprises, and learned to flag risks two weeks early' passes.

The same test governs company research. 'I admire your company's commitment to innovation' fails — every company claims it, so the sentence proves no research happened. 'I've followed your expansion into home-services dispatch; my two years scheduling field technicians is exactly the operations problem you're now hiring for' passes, and took one visit to their website.

Apply it to the whole letter last: if swapping the company name breaks nothing, you've written the null letter. Two specific sentences — one about them, one connecting you to them — are what separate a letter from a form.

Mechanics that quietly matter

Address a person if a name is findable — the hiring manager on LinkedIn, the department head on the team page. If not, 'Dear Hiring Manager' is the correct fallback; never 'To Whom It May Concern', which timestamps the letter to 1987. Match the letter's header to your resume's header for a coherent package, and export both as PDF.

Keep tone in the professional middle: no 'To Whom It May Concern' stiffness, no 'Hey team!' familiarity, no humor you can't be sure lands. Plain, confident, first-person sentences. Contractions are fine. Exclamation points, at most one, probably zero.

Proofread it as hard as the resume — a letter arguing for your attention to detail cannot contain the wrong company name, and pasted-in previous-employer names are the most common cover letter disaster in existence. Read it aloud once; ten minutes total is the budget, and a saved personal template (structure fixed, evidence and bridge swapped per application) is how it stays ten minutes. Worked examples by job are in our cover letter examples.

If you draft with AI, treat the draft as scaffolding, not product: hiring managers now see the default AI letter — same cadence, same 'I was excited to discover' opener — dozens of times a week, and it registers as the new null letter. Feed the tool your real numbers, rewrite the result in your own sentences, and apply the swap test to what remains.

Special cases worth the extra five minutes

Career changers: the letter is your primary document, not the resume's accessory. Tell the transition as one arc — what you did, why you're moving, what carries over, and the credential or project that anchors the destination (the full playbook). This is the story a resume structurally cannot tell.

Employment gaps: one factual sentence in the letter closes the question before the interview — 'After a two-year caregiving break, I recertified in 2025 and I'm fully back.' The letter is often a better home for this line than the resume itself (gap handling).

Entry-level: your letter substitutes enthusiasm-with-evidence for experience. Name the specific projects or coursework that map to their needs, and let genuine, concrete interest in this employer do work it can't do for senior candidates — at your level, readers still price it in (the no-experience guide).