Using AI to write a cover letter: what works and what employers allow

You can use AI to write a cover letter, and many employers allow it. The AI should shape and polish your material, not supply it. Research on hiring platforms found that once AI made tailored letters cheap, employers stopped treating them as a sign of effort. A letter now earns attention through specific, true evidence that only you could give.

What the research shows

Three studies of online hiring platforms help explain what happens when candidates use writing tools.

• Writing help on resumes. Researchers gave algorithmic writing help to a random group among nearly half a million jobseekers. That group was hired 8% more often, and employers were no less satisfied with them (Wiles and others). Clearer writing helped employers judge the candidates.
• An AI cover letter tool. A large online labor platform introduced one, and callback rates rose. But the link between a letter's match to the job and the chance of a callback fell by 51% (Cui, Dias and Ye). Employers turned to other signals, such as past work history. Candidates who spent more time editing the AI draft were more often hired.
• Tailored applications. A second study, using data from Freelancer.com, found employers once paid more for workers whose applications were tailored to the job. After AI writing tools arrived, that premium disappeared (Galdin and Silbert).

These studies cover freelance platforms, not every job market. Their lesson still applies. Clear writing helps. A letter that only mirrors the job posting no longer stands out, because anyone can produce one in seconds.

What employers allow

Employers that publish candidate guidance tend to allow AI help on written materials, with one condition: the content must be yours and must be true.

• Anthropic asks candidates to write the first draft of application materials themselves and then use its AI model to refine it (Anthropic).
• Greenhouse lets candidates use AI to build a resume or cover letter. The content must reflect their real experience and skills (Greenhouse).
• The UK Civil Service lets candidates use AI to refine ideas and check spelling and clarity. It tells them not to inflate their experience or paste generic AI responses into an application (Civil Service Careers).

It's not about creating a persona that isn't you.

Read the job posting and the employer's careers pages for a stated rule. If you find none, the safe reading is the common one above: AI may help with the wording, and the facts and reasons must be yours. For more on how rules differ by stage, see can you use AI in a job application.

Where AI helps most

AI tools are good at the parts of a letter that depend on wording rather than facts. Use them for these jobs:

• Choosing which of your examples best fits the posting, from a list you wrote.
• Proposing an order for the paragraphs.
• Cutting a long draft to a set length without losing the evidence.
• Matching the tone to the employer, from formal to plain.
• Catching spelling, grammar and repeated words.

Keep the tool away from the parts that depend on you: what you did, what resulted, and why you want this job.

A method that keeps the letter yours

1. Write your raw notes first. Answer three questions in plain words: why this role, why this employer, and which two pieces of your work prove you can do it. Include numbers and names where you can share them.
2. Give the AI the posting and your notes. Ask it to propose a structure and a first draft of no more than 250 words. Tell it to use only the facts in your notes.
3. Edit line by line. Replace every phrase that could fit any company. Cut any claim the AI added that is not in your notes.
4. Read it aloud. Change any sentence you would not say in an interview.
5. Run the check below before you send it.

A request in step 2 might read: "Here is a job posting and my notes. Draft a cover letter of up to 250 words. Use only the facts in my notes. Open with the second example. Use a plain, direct tone. Mark any sentence where you had to guess."

The last instruction matters. Asking the tool to flag its guesses makes invented details easier to find. The free guide on giving context explains why source material produces better output than a bare request.

Signs a letter reads as generic

AI drafts tend to share a few patterns. None of them proves AI use, and a careful human can write them too. Each one weakens a letter.

• Claims with no evidence, such as "I am a results-driven professional".
• A paragraph that restates the job posting back to the employer.
• Praise for the company that would fit any company in the sector.
• Even, polished sentences with no detail a reader could check.
• Skills you do not have, added because the posting asked for them.

The last pattern is the serious one. An invented skill is a false statement on an application. Greenhouse says misrepresentation can lead to disqualification (Greenhouse). The Scottish Government withdraws applications that present AI-generated experience as the candidate's own (Scottish Government).

The check before you send

• Check every name, date, number and job title against your records.
• Make sure the employer's name and the role title are correct throughout. AI drafts reused across applications often keep the wrong one.
• Remove any private detail about a past employer or client that you pasted into the tool.
• Keep a copy of your notes. They are the evidence behind each claim if an interviewer asks.

The same habits apply to all AI-assisted writing at work. The output verification checklist turns them into a reusable list.

If the employer asks whether you used AI

Answer plainly. Say what you used it for, such as structure and editing, and that the content and examples are your own. Employers that allow AI help expect this answer. Employers that ban it should say so in the posting, and then you should not use it.

A cover letter shows how you write with AI help. Work samples can show more of how you use it on the job. See how to build an AI work portfolio.