How to Write a Cover Letter That Wins Over HR
A three-paragraph cover letter structure HR will finish reading, with opening lines, how to match achievements to the JD, mistakes to avoid and a full example.
You find a role that matches you on almost every point. You hit apply with your resume and the system asks if you have a cover letter. You hesitate because you do not know what to write that is not already in your resume, so you skip it, even though this may be the only space where you can say why you fit this company specifically, not just this type of job.
What a cover letter is and how it differs from a resume
A resume records what you have done. A cover letter is a short letter connecting what you have done to what the company needs. The reader should feel you chose to apply here, not that you sent the same letter to a hundred places. A good cover letter is short, specific and written fresh for each role.
A three-paragraph structure that works for almost any job
Paragraph 1: open with a specific reason
State the role and a reason for your interest in this company that nobody else could reuse. Compare these two:
- Too generic: I am very interested in the company's Marketing Executive position.
- More specific: I have followed your bottle recycling campaign since the start of the year and want to help extend campaigns like it to young people in the provinces, which is why I am applying for the Marketing Executive role.
Finding a reason like this takes less than fifteen minutes: read the company's website, recent news and posts.
Paragraph 2: the value you bring
Choose two or three achievements that best match the requirements in the JD. Do not tell everything. Highlight the three points the JD stresses most, then find an achievement that answers each. Include numbers if you have them. Hypothetical examples:
- Managed an online shop's TikTok account and doubled orders from that channel within six months.
- Reworked the delivery process with the warehouse, cutting wrong-address shipments so customer complaints dropped noticeably.
If you are not sure how to pull key terms from a JD, read how to extract keywords from a JD.
Paragraph 3: close with confidence
Summarise your interest, say you are ready to talk further, and thank them. Short and polite is enough, for example: I would welcome the chance to discuss how my content experience could help the team. Thank you for your time and consideration.
A full sample cover letter (hypothetical)
Dear Khun Somjai, People Team,
I am applying for the Customer Success Specialist role because the company is expanding its service to SME shops in the North, the group I have looked after for three years in my current job.
I have been responsible for more than a hundred small retail customers, run monthly online training on the system, and created a Thai-language guide that lets customers set up the system themselves, reducing repetitive questions to the support team.
I would be glad to discuss how this experience could help your team. Thank you for your time and consideration.
Thanapol Jaidee
Mistakes to avoid
- Sending one template everywhere: HR can tell immediately it was not written for them.
- Repeating your resume: a cover letter should select and connect stories, not repeat every line.
- Focusing on what you want: phrases like “I want to gain experience” should become what you will help the company do.
- Misspelling the company's or person's name: proofread at least twice.
- Going over one page: three short paragraphs readable in a minute is ideal.
Do you need one every time?
Not for every role, but write one when you genuinely want the job, when you are changing fields and need to explain why, when you have a gap worth a short explanation, or when the role demands strong communication. Read more in is a cover letter still needed.
Your resume says what you can do. Your cover letter says why it should be here.
Where to start
- Read the JD and highlight the three most important requirements.
- Spend fifteen minutes finding a specific reason you want this company.
- Choose two or three achievements that answer those requirements.
- Write using the three-paragraph structure, under one page.
- Read it aloud once, check the company and recipient names, then send.
Let the AI Career Assistant draft a first version from the JD and your experience, then adjust it to your own voice. If you want feedback from someone who has hired before, book a chat with a mentor, then search for jobs that fit you.