How to Write a Cover Letter (Free Builder That Matches Your CV)

Most people spend days polishing a résumé and then write the cover letter in ten minutes, the night before the deadline. That is backwards. Recruiters often read the letter first, and it is the only part of your application where you get to sound like a person instead of a list of job titles.

The good news: a cover letter is not hard to write once you know what goes in it. Below is the structure that consistently works, how long it should be, and how to turn it into a polished PDF in a few minutes using the free cover letter builder on techyworks.online — which can also match the résumé you have already built.

What a cover letter is actually for

A cover letter is not a summary of your CV. If the reader can get the same information from your résumé, the letter has wasted their time. Its job is to answer three questions your CV cannot: why this role, why this company, and what you are like to work with. Your CV proves you are qualified. Your letter explains why you care.

The four-paragraph structure that works

Nearly every strong cover letter follows the same shape. You can write yours in four short paragraphs:

• 1 — The opening: Say which role you are applying for and give one concrete reason you are a serious candidate. Skip "I am writing to express my interest" — it says nothing. Lead with the strongest fact you have.
• 2 — The evidence: Pick one or two achievements that map directly onto the job description, and put numbers on them. "Cut API latency by 45%" beats "improved performance." One specific result is worth a paragraph of adjectives.
• 3 — Why this company: Show you did more than press apply. Reference something real — a product, a blog post, a way they work. This is the paragraph most applicants skip, which is exactly why it stands out.
• 4 — The close: Thank them, say you would welcome a conversation, and mention your attached résumé. Keep it short and confident.

How long should a cover letter be?

Between 250 and 400 words, on a single page. Shorter than that and you have not given any real evidence; longer and most hiring managers stop reading. If your letter spills onto a second page, cut the paragraph that repeats your CV — it is almost always the one that can go.

Write it without facing a blank page

The hardest part of a cover letter is the first sentence. The builder on techyworks.online gives you ready-made openings grouped by your situation — applying directly, referred by someone, changing careers, a recent graduate, or reaching out cold — plus middle and closing paragraphs you can drop in and edit.

They are a first draft, not a finished letter. Anything the starter cannot know is left in curly braces so you can see exactly what still needs your own detail, and the builder warns you if any of those placeholders are still there when you download.

Make it match your résumé

An application looks far more considered when the letter and the CV are visibly a set. If you built your résumé with our résumé builder, click Matching cover letter and your name, contact details, accent colour, page size, and a design that suits your CV's header are carried straight across. You only have to write the part that is specific to the job.

There are four letter designs — Classic Block, Modern Accent, Letterhead Bar, and Minimal Centered — and you can switch between them at any time without retyping a word. You can also choose A4 or US Letter, so the margins are right for wherever you are applying.

Step-by-step: build your cover letter

• Step 1 — Open the builder: Go to techyworks.online and open the Cover Letter Builder from the menu.
• Step 2 — Add your details: Fill in your name and contact information, or click "Use my resume details" to pull them from a résumé you already made.
• Step 3 — Name the company and the role: Add the hiring manager, the company, and the exact job title. The greeting and subject line fill in automatically if you leave them blank.
• Step 4 — Write the letter: Work through the paragraphs, using a starter if you want a first line to react to. The PDF preview updates as you type.
• Step 5 — Check it: The letter check flags the things that matter — length, one page, whether you named a real person, and any placeholders you forgot.
• Step 6 — Download: Save a clean PDF with no watermark, or open it in the editor for any final touches.

Mistakes that get letters binned

• Addressing nobody: "To Whom It May Concern" reads like a form letter. Spend two minutes finding the hiring manager's name.
• Retelling your CV: If a paragraph could be pasted into your résumé, cut it.
• The same letter for every job: A generic letter is worse than none. Change at least the opening and the "why this company" paragraph each time.
• Leaving a placeholder in: A stray {company} in a sent letter ends an application instantly.
• Making it about you only: Frame your experience as what it lets you do for them.

A note on applicant-tracking systems

You will see tools advertising an "ATS score" for cover letters. Be sceptical. Résumés are parsed by software, but cover letters are overwhelmingly read by people, so a percentage badge gives you false confidence rather than useful advice. We deliberately do not show one. Your letter is checked on things that genuinely matter to a human reader — clear length, one page, addressed to a real person, and no unfinished placeholders.

Private and free, start to finish

Like every tool on techyworks.online, the cover letter builder runs entirely in your browser. Your name, your contact details, the company you are applying to, and everything you write stay on your own device — nothing is uploaded to a server. There is no cost, no sign-up, and no watermark on the finished PDF.

Write yours today

A good cover letter takes about twenty minutes once you stop staring at an empty page. Open the Cover Letter Builder, pick a starter, tell them why you want the job, and send an application that reads like it was written for them — because it was.