How to write a cover letter with AI (step-by-step guide)

You're staring at a job posting you're genuinely excited about. You open a blank document. You type "Dear Hiring Manager" and then sit there for twenty minutes trying to figure out what comes next.

Meanwhile you have eleven more applications to submit this week.

This is where AI cover letters make sense. Not because writing is hard, but because writing the same type of document over and over, customized each time, for dozens of applications, is an unreasonable use of your time. A well-prompted AI can produce a solid first draft in under two minutes. Your job is to make it specific and make it yours.

Here's the process.

Step 1: Get your resume ready

The AI needs something to work with. Your resume is that something. If your resume is missing your most recent role or skips your best accomplishments, the cover letter will have the same holes.

You don't need a perfect resume. You need an accurate one, especially for the experience that's most relevant to what you're applying for.

Step 2: Copy the full job description

Not just the title and company. The whole thing. Responsibilities, qualifications, "nice to haves," all of it. The more context the AI has about what this employer actually wants, the better it can connect your experience to their needs.

Pay attention to the language in the posting. If they say "cross-functional collaboration" instead of "working with other teams," the AI will pick up that phrasing and mirror it. This also helps with ATS keyword matching if you're submitting through a portal.

Step 3: Generate the first draft

Upload your resume and paste the job description into whichever AI tool you're using. Four-Leaf's cover letter generator does this in one step. The AI reads both documents, finds the strongest overlaps between your experience and the role's requirements, and writes a full letter.

The output follows a proven structure: a specific opening that shows genuine interest, a middle section connecting your most relevant accomplishments to the role, and a short closing that invites the next step. Three paragraphs. That's the format hiring managers respond to best.

Step 4: Edit it

This is the step that separates a useful cover letter from an embarrassing one.

Read the draft and check three things.

Accuracy. AI occasionally invents details. It might attribute a result to the wrong role or exaggerate an accomplishment. Fix anything that isn't precisely true. One inaccuracy in an interview and your credibility is gone.

Voice. Does this sound like something you'd actually write? If you're conversational, a stiff formal letter will feel wrong to the reader. If you're applying to a conservative law firm, casual language won't land. Match your personality and the company's culture.

Specificity. The best cover letters reference something real about the company. A recent product launch. A blog post from their engineering team. A value statement on their careers page. The AI probably doesn't know these things. Add one or two sentences that prove you've done homework a machine can't do for you.

Step 5: Read it out loud and send

Reading out loud catches awkward phrasing your eyes skip over. Make sure the letter fits on one page, the company name and role are correct, and your contact information is there.

Then submit and move on. The whole process, from paste to send, should take under five minutes.

What makes the difference between good and bad

A good AI cover letter has specific accomplishments with numbers. "I led a migration that reduced data latency from 24 hours to under 5 minutes" beats "I have experience with data infrastructure." It draws clear connections between your past work and this specific role. And it reads like a person wrote it, not a thesaurus.

A bad AI cover letter opens with "I am thrilled to apply for this exciting opportunity at your innovative company." Every candidate could write that sentence for every job. It restates the resume in paragraph form, wasting the reader's time. And it's full of phrases like "I am confident that my unique blend of skills" that make hiring managers stop reading.

If your letter contains the phrase "valuable asset to your team," delete it and start over.

When to bother with a cover letter at all

Not every application needs one. If you're applying to a high-volume tech role through an online portal with no cover letter field, spend that time on your resume instead.

Cover letters earn their keep in specific situations. High-volume job searches where you're submitting 15+ applications per week and can't hand-write each one. Career transitions where your resume doesn't obviously match the target role and the letter needs to bridge the gap. Competitive roles at smaller companies where someone is actually reading every application. And roles where writing quality matters, like marketing, communications, or product, where the cover letter doubles as a writing sample.

The one thing you should not do

Don't generate a letter and submit it unread. AI makes mistakes. Wrong company names. Hallucinated job titles. Accomplishments pulled from the wrong context. Every letter needs a human pass before it goes out.

And don't use the same letter for every application. The entire point of AI-assisted cover letters is personalization at scale. A letter tailored for a data analyst role at a healthcare startup should read nothing like one for the same title at a financial services firm.

The AI gives you a starting point. What you do with it, the editing, the personal details, the company-specific research, is what makes the letter worth reading.

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Related reading:

• Do you actually need a cover letter? breaks down when they help and when they're a waste of time.