What it does that a resume cannot
A resume is a document you edit and reuse. It is a record of facts, ordered and selected, and it can be tailored but it is fundamentally the same document across applications. A cover letter is written to one employer and can therefore make an argument — about why this role, why now, why you specifically.
It also handles the things that would look strange on a resume: a career change that needs a sentence of explanation, a relocation, a gap, a step down, an unusual route into the field. Those explanations are awkward as bullets and natural in a letter.
And it demonstrates writing, which for a great many roles is a substantial part of the job. A cover letter is a work sample whether or not anyone calls it that.
When it is worth writing
When it is asked for, always, and taken seriously — an employer who requests one and receives a generic paragraph has learned something. When you are applying directly to a person or a small organisation, where somebody will genuinely read it. When something about your application needs explaining. And when the role involves writing.
It is worth less when you are applying through a portal that offers an optional attachment field to a large organisation, where the first screen is automated and the letter may never be opened. It is worth nothing at all when it is generic — a letter that could be sent to any company is read as evidence of exactly that.
The honest position: one strong tailored letter to a job you want beats twenty generic ones, and if you do not have time to write it properly, spend the time on the resume instead.
The structure that works
Four paragraphs, one page, under 400 words.
- Open with why this job and this employer, specifically. Not "I am writing to apply for" — that is the subject line, not a sentence.
- Then the strongest piece of evidence you have that maps onto what they asked for, expanded beyond what the resume bullet could say.
- Then what draws you to this organisation in particular, demonstrating you know something real about it.
- Then a short close. What you are asking for, and nothing servile.
A cover letter is not a cover page
These get confused often enough to be worth separating. A cover letter is the letter described above. A cover page — a title sheet with your name on it in large type, in front of the resume — is a different thing, and for a resume it is almost always wrong.
The reasons are practical. It puts a page between the reader and your content at the exact moment you have their attention. It can confuse parsers, which may take the title page as page one and miss the header on the real first page. And nobody has ever asked for one.
The narrow exceptions are portfolios and formal proposal documents, where a title page is part of the expected format. For an ordinary job application, send the resume, with a cover letter as a separate file if one is wanted.
