How to write a cover letter for an internship

How long should an internship cover letter be

Keep it to 200 to 300 words. That is roughly three paragraphs on a single page with normal margins. Anything longer signals that you have not edited your work, which is itself a red flag for roles that require written communication.

In the US, Canada, the UK, and Australia, hiring managers for internship programs consistently say they prefer brevity. A summer internship at a 50-person startup and a rotational program at a large bank both expect the same thing: a letter that respects their time.

• Paragraph 1: why this role at this company, in two or three sentences
• Paragraph 2: one or two specific things you have done that are relevant
• Paragraph 3: a clear, low-pressure ask to talk

What to put in the opening line

Name the role and give one concrete reason you want it. Do not open with 'I am writing to express my interest.' Everyone is. Instead, try something like: 'I am applying for the summer 2027 data analyst internship because your team uses dbt and Python, which I have been building with for the past year in my university's data club.'

That single sentence tells the recruiter you read the job posting, you know the tools, and you have already used them outside class. It does more work than two generic paragraphs about being a hard worker.

How to show experience when you have very little

Most internship applicants have limited paid work history, and that is expected. What matters is that you point to real output, not just participation.

Think in terms of projects, not jobs. A class project counts if you can describe what you built, what tools you used, and what the result was. A volunteer role counts if you can say how many people you helped or what changed because of your work.

• Class projects: name the course, the deliverable, and one result
• Clubs or societies: describe your role and one specific contribution
• Freelance or casual work: mention the client type and what you produced
• Open source or personal projects: link to a repository or portfolio if you have one
• Relevant coursework: only list it if the job posting specifically asks for that knowledge

Tailoring the letter to each job posting

A generic letter is easy to spot and easy to reject. Tailoring does not mean rewriting everything. It means changing three things: the company name, the specific role detail in your opening, and one example in your middle paragraph that maps to a skill the posting emphasizes.

Read the job posting and find the two or three skills or tools mentioned most often. Then check whether any of your projects or experience touch those areas. If the posting says 'strong written communication,' your example should involve writing. If it says 'comfort with ambiguity,' your example should show you figured something out without being told exactly what to do.

Break-In Bad writes a tailored cover letter for each job from facts you confirm, so you are never sending something that contradicts your resume or invents experience you do not have. It pulls from what you have already told it and matches the language of the posting.

How to close without sounding desperate or pushy

The closing paragraph should do one thing: make it easy to say yes to a conversation. Keep it to two sentences.

A clean close sounds like: 'I would welcome the chance to talk about how I could contribute to the team this summer. Thank you for your time.' That is it. Do not say you will follow up on a specific date unless the posting asks you to. Do not say the role is your dream job. Do not apologize for your lack of experience.

1. Thank them for reading
2. Express interest in a conversation, not in 'the opportunity'
3. Sign off with your full name and a link to your LinkedIn or portfolio if relevant

Common mistakes to cut before you send

Most internship cover letters fail for the same small reasons. Read your draft once looking only for these issues.

• Restating your resume line by line instead of adding context
• Using the wrong company name because you copied from another application
• Phrases like 'I am a quick learner' or 'I am passionate about' without any evidence
• Addressing it 'To Whom It May Concern' when the hiring manager's name is on LinkedIn
• Submitting a PDF with a filename like 'cover letter final v3 REAL.pdf' instead of 'FirstName-LastName-CoverLetter.pdf'
• Forgetting to change the role title when you reuse a template