A cover letter is a one-page argument that pairs with your resume: greet a real reader, hook the company by quoting its own posting, prove one qualification with one concrete example, and close by asking for the interview. Keep it between 250 and 400 words, write it fresh for every application, and match the posting's tone — the builder and tone checker on this page handle the drafting and the casual-slip check.
Honesty note: the builder assembles what you draft into a letter-shaped page — it does not find jobs, verify company details, or write sentences for you. The worked example below is an invented, illustrative letter from a fictional student to a fictional bookstore; every name, number and open rate in it exists for teaching. Your application needs your real details, and you are the one who checks them.
Build the letter, one paragraph at a time
The four paragraphs of a cover letter do four different jobs, and mixing them up is where most student letters die. The greeting names a person — five minutes on the posting and LinkedIn usually finds one. The hook says why this company, in the words of its own job ad, and it is the one paragraph that can never be reused. The body carries a single qualification with a single piece of evidence: a number, a named project, an outcome. The closing asks for the interview and says when you can start. Draft each in its own field below, click a sentence frame when you are stuck for an opener, and watch the full letter assemble above the counters.
The word meter holds you to the honest range. Under 250 words, either the hook or the evidence is usually missing; between 250 and 400, the letter fills one comfortable page; past 400, you have started re-typing your resume, and recruiters recognize that pattern before the second paragraph. The counter updates as you type, so the budget is visible while there is still time to fix it.
What you type saves to this browser only (key csw-clt-v1), so a closed tab is not a lost draft. Load example fills an invented letter — a student called Jordan Ellis applying to a fictional bookstore — so you can take a finished letter apart before writing your own; it is the one thing the page never saves. Reset wipes the fields and the stored key together.
One habit worth stealing from the other side of the table: read your hook and ask whether it would still make sense with a different company's name dropped in. If it would, the hook is not written yet — it is still a template, and templates read like mass mail.
Cover letter builder
100% private — runs in your browserNames a real reader. One line — a name you found, or Dear Hiring Manager after a real search.
Quotes the posting's own words and connects them to you. Never reusable, never pure flattery.
One qualification, one example, one number. The longest paragraph — and still not a resume re-type.
Asks for the interview, thanks the reader, and states availability. Two or three sentences.
Your cover letter, assembled live
Paragraphs autosave in this browser only — the loaded example is the one thing that is never saved. Reset erases the stored key.
Before you send: six cover letter checks
- The greeting names a person — or says Dear Hiring Manager after a real search
- The hook names the company and quotes one detail from its posting
- The body carries one example with a number, a named project or an outcome
- Nothing in the letter repeats a resume line word for word
- The closing asks for the interview and states availability
- The whole letter fits the 250-400 word range and one page
Notice what the builder refuses to do: it never writes a sentence for you. The sentence frames are openers with bracketed gaps — [company], [top requirement], [measurable result] — and the gaps are exactly the parts a recruiter reads for. If a frame stays half-empty, that is usually the application telling you something: you cannot name the requirement yet, or you have not found the number your example produces. Both are research problems, not writing problems, and both are fixable in twenty minutes with the posting and your own records.
The four paragraphs and their jobs
Every sentence in a cover letter serves one of four jobs, and the fastest way to diagnose a flat letter is to label each paragraph by job and see which one went missing. The table below is the whole structure — four rows, no secret fifth paragraph.
| Paragraph | Its one job | Length share | What the reader checks |
|---|---|---|---|
| Greeting | Names a real person at the company | One line | Is the name spelled right? |
| Hook | Says why this company, from its own posting | 50-80 words | A posting detail, not flattery |
| Body | Proves one qualification with one example | 120-180 words | A number, project or outcome |
| Closing | Asks for the interview, states availability | 40-70 words | Did you actually ask? |
Greeting — five minutes to a real name
The greeting is one line, and it still gets more attention than any sentence you will write. A named reader — Dear Ms. Okafor — signals that this letter went to one company; Dear Hiring Manager is the honest fallback when the name stays hidden after checking the posting, the company site and LinkedIn. The greeting is also where tone rules bite hardest: Hey there and Hi team read as messages to a friend, not an application, and the tone checker below flags both.
Hook — why this company, in its own words
The hook is a one-paragraph version of a claim about fit, and the grammar of a good claim is the same one the thesis statement generator teaches for essays: a specific assertion plus a reason it is true. Swap the essay terms for hiring terms and the move is identical — quote the posting's own requirement, then attach yourself to it in one sentence. What the hook must never be is a paragraph of company praise. The reader knows their own company; the flattery paragraph spends your 250 words proving nothing.
Body — one qualification, one proof
The body is where students over-write, because the instinct is to list everything the resume already lists. One qualification wins instead, carried by one example with a number in it: a newsletter rebuilt for a student club, a course project handed to a real client, a register shift that ended with a cleaner stockroom. The example does the arguing; the claim just names it. If your evidence is coursework rather than work experience, say so plainly — in my retail analytics course, my team's pricing study graded highest of forty — and the same structure holds.
Closing — ask, thank, state
Three moves, two sentences: ask for the interview, thank the reader, state when you can start. Letters without the ask end on a shrug — I look forward to hearing from you is a polite version of nothing, because it asks for no decision. A specific ask — walk through the newsletter redesign in an interview — gives the reader a yes-or-no question, and yes-or-no questions get answered.
How long a cover letter should be
The 250-400 word range is not a superstition; it is what four real paragraphs add up to when each one does its own job. The research paper abstract obeys the same law from the academic side — a one-page document that must win over a skeptical reader, where every sentence pays rent. The bands below translate the counter in the builder into decisions.
| Word count | What it says about the letter | The fix |
|---|---|---|
| Under 150 | Hook or evidence is missing — it reads as a note, not an application | Write the hook from the posting; add one numbered example |
| 150-249 | Workable for a referral where someone vouches for you in advance | For cold applications, add a second proof sentence to the body |
| 250-400 | The sweet spot — four full paragraphs on one comfortable page | Ship it; just run the tone check first |
| 400+ | You are re-typing the resume — readers notice before paragraph two | Cut company praise and repeated resume lines first |
Two length rules sit outside the counter. First, the letter never runs past one page, whatever the word count — dense paragraphs hide in margins. Second, white space is part of the argument: a page with four breathing paragraphs reads as organized before anyone reads a word, which is the first quality a hiring screen tests. When the letter is done, a final count in the word counter settles any dispute with a form's character limit.
Tone: formal without sounding like a form
Cover letters fail at both ends of the tone scale. Too casual — Hey! I'd be super pumped to join you guys — and the letter reads as spam written by a friend. Too stiff — pursuant to my enclosed credentials — and it reads as a template older than the reader. The workable register sits in the middle: contractions are fine, first person is required, and internet slang is where the checker draws the line.
The tone checker below scans word by word, not vibes. It keeps a list of 23 markers in two families — internet slang (dude, lol, awesome, gonna, wanna, yeah) and filler intensifiers (super, totally, literally, basically) — plus an emoji scan, because a 🙏 does not survive an applicant tracking system. Paste any draft, yours or the builder's, and every hit gets flagged in place with a suggested register fix.
Tone checker
Nothing you paste leaves your deviceWord-based check: 23 casual markers + emoji scan. Flags update as you type; nothing is saved.
Highlighted draft
Two tone rules the checker cannot enforce, because they are judgment calls. Match the posting: a startup that writes we ping customers constantly has licensed a warmer letter than a bank that writes successful candidates will demonstrate. And cut the intensifiers even when they are polite ones — very, really, truly — because the evidence paragraph already supplies the intensity, in numbers.
Five cover letter mistakes and their fixes
Every mistake below is one recruiters name most often for entry-level and internship applications, and each has a one-move fix you can apply in the builder.
| Mistake | Why it fails | The fix |
|---|---|---|
| Re-typing the resume | The letter adds no argument, so it reads as a slow copy of a fast page | One qualification in the body, proved with one example that is not on the resume |
| To Whom It May Concern | Signals a mass mailing from the first line — the greeting is the cheapest specificity you have | Five minutes of searching; then Dear Hiring Manager if the name stays hidden |
| Two paragraphs of company praise | Spends the word budget proving you read the About page, not that you can do the job | Compress the flattery into one hook sentence quoted from the posting |
| Empty claims | Hard worker, team player and passionate appear in every application, so they distinguish no one | Replace each claim with the example that would prove it — number included |
| No call to action | The letter ends on a shrug, giving the reader no question to answer | Ask for the interview and state availability in the closing |
The mistakes share one root: the letter written for any job instead of this job. That is also why the builder separates hook from body — the hook is the paragraph you rewrite every time, and keeping it in its own field makes the rewrite visible instead of optional.
One letter, built: an illustrative example
Here is the invented letter the Load example button fills — Jordan Ellis, a final-year marketing student, applying to Larkspur Books, a fictional independent bookstore hiring a summer marketing assistant. Every name and number is illustrative; the structure is the point. It runs 259 words, inside the sweet spot, and each paragraph labels its own job.
1 · Greeting
Dear Ms. Okafor,
2 · Hook — why this company
Your posting for the summer Marketing Assistant role asks for someone who can turn a small email list into steady sales, and it names the numbers plainly: 12,000 subscribers, a 19 percent open rate, and a goal to lift both. Growing a list from a slow start is the exact problem I spent last semester solving for a student club, with the same free tools your posting lists. That combination — a stated target and a list small enough to know by name — is the challenge I want for a summer.
3 · Body — qualification with proof
As events lead for the Campus Film Society, I rebuilt our weekly newsletter: one story per issue instead of five announcements, sent Thursday evenings when our readers actually open mail. Over one term, open rates moved from 21 to 34 percent, and pre-sales for our spring series sold out two weeks early — 400 seats, a first in the club's history. The work was one hour a week, a rule from my marketing coursework — every email makes one promise and keeps it — and a spreadsheet I still keep, because the numbers were the argument. If the interview runs long on numbers, I can bring the before-and-after spreadsheets from the club project.
4 · Closing — call to action
I would welcome the chance to walk through the newsletter redesign and what I would test first on Larkspur's list. Thank you for your time — my portfolio and a professor reference are ready on request, and I am available from May 15 through August. Every number above has a spreadsheet behind it, ready for the interview.
Read it against the anatomy table and the division of labor shows: the greeting spends one line and a real name; the hook quotes the posting twice and attaches the candidate once; the body carries exactly one qualification — email marketing — with three numbers doing the proof; the closing asks, thanks, and states. Nothing repeats the invented resume, because the letter's job was to add what the resume cannot argue.
Letter drafted, but the deadline is winning?
A cover letter is the short document; the resume, the portfolio and the rest of the application take longer, and the posting's closing date does not move. If the writing stack will not clear in time, a quoted, deadline-bound writer can turn your experience into a submission-ready application — your details, your voice. The form below is the way to ask.
What this page cannot do
The honest limits, because a tool that states them is the only kind worth trusting with an application:
- It does not find names for you. The greeting field holds whatever you type; whether Ms. Okafor is real is a question for the posting, the company site and LinkedIn, and it stays yours to check.
- It does not verify company facts. The hook quotes the posting; the quoting is your job, and so is noticing when a posting contradicts the company's own site.
- The example is invented. Jordan Ellis, Larkspur Books, the 19 percent open rate — all illustrative teaching material. Your letter needs your real numbers, and invented ones are easy to catch in an interview.
- The tone checker reads words, not meaning. It flags 23 markers plus emoji. It cannot tell you that your joke about the office coffee lands badly; read the letter aloud once for the rest.
- No letter survives a wrong company name. The classic application-killer is a great letter addressed to the wrong reader — proofread the greeting last, every time.
Kept in its lane, the page does one thing well: it turns write a cover letter into four fields with four jobs, a word budget you can see, and a tone check that catches what spell-check ignores. The study guides hub holds the rest of the application shelf — personal statements for graduate school and admission essays — and the free writing tools handle everything after the draft.
One boundary worth naming for the shelf itself: a cover letter argues for a job, and if the application is for a program instead, the document changes shape — the personal statement guide owns that form, prompt decoding included. The four-paragraph discipline travels; the content does not.
Quiz: five questions on the letter
Five questions on the decisions this page makes — length, hooks, greetings and honest tone. Every wrong answer reveals the right one, and four options keep the guessing honest.
1. A cold-application cover letter lands at 180 words. What does that usually mean?
2. What does the hook paragraph do?
3. The body paragraph earns trust with…
4. The posting hides every name. The best greeting is…
5. Which draft line will the tone checker flag?
Frequently asked questions
How long should a cover letter be?
Between 250 and 400 words — most of one page, in four short paragraphs. Under 150 words usually means the hook or the evidence is missing; past 400 you are re-typing the resume, and the reader can see it. Recruiters skim the letter before the resume, so the first hundred words carry most of the decision.
Should I reuse one cover letter for every job?
Reuse the frame, never the letter. The greeting and the body's evidence can carry over between similar roles, but the hook names the company and quotes its own posting, so it must be rewritten every time — a letter that would still make sense with another company's name dropped in is the one recruiters bin first.
What if I cannot find the hiring manager's name?
Check the posting, the company site and LinkedIn once; that takes about five minutes. If the name stays hidden, write Dear Hiring Manager — specific enough and polite. Skip To Whom It May Concern: it reads as a form letter from the first line, and it is older than most of the people reading it.
Do students and new grads still need a cover letter?
When it is optional, it is still your cheapest edge: most classmates skip it, so a short, specific letter does double work. It is also the only place you can explain the gap, the career switch or the coursework that the resume cannot argue for by itself. Internship and entry-level postings read more letters per hire than senior roles, not fewer.
Does what I type stay private?
Yes. The builder runs entirely in your browser and nothing is uploaded anywhere. Your four paragraph fields save to this browser's local storage under one key, csw-clt-v1, so a closed tab does not lose the draft; the tone-checker input, quiz answers, poll clicks and the loaded example are never saved. Reset erases the stored key and clears every field — on a shared computer, press it before you walk away.
Did the builder hand you a letter worth sending?