Most cover letters restate the resume in longer sentences, which is why most of them go unread. The ones that get read do one thing: they say something about this company and this role that could not have been written for any other application.
This writes that letter, under 250 words, from the posting and your background. It also shows its working, so the next one you write yourself is better. If your background is thin on specifics, it will tell you what is missing rather than papering over it with adjectives.
How to use it well
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1
Paste the full posting, not a summary. The letter opens with why this company and this role, and it can only find that in the text.
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2
In your background, give two or three concrete things you have done that match the posting, with numbers where you have them.
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3
Read "What would make it stronger", add what it names, and run it again.
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4
Rewrite at least one sentence in your own words and check every fact before you send it.
Before you apply, run your resume and the same posting through the ATS resume checker, so the letter and the resume make the same case.
Questions people ask
How long should a cover letter be?
Under 250 words. A hiring manager with a pile of applications gives each one little time, and a long letter gets skimmed to the end and remembered for nothing.
Should I still send a cover letter in 2026?
Send one when the application has a field for it or the posting asks. A specific letter helps at the margin, especially for a career change or a gap that needs explaining. A generic one is neutral at best.
Will the letter sound like AI wrote it?
It is written to avoid the tells: no 'I am writing to express my interest', no adjective stacks, no restating the job back at them. Read it once and change a sentence to your own phrasing before you send it, and it will read as yours because the facts in it are.
Can I use the same letter for several jobs?
No, and that is the point. The letter opens with why this company and this role. Run it again for the next posting; it takes seconds and costs nothing.
Where to go next
More free tools
ATS resume checker
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The questions, what they test, and where they push back.
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Each bullet rewritten, and why the original was weak.