Updated November 2026
TL;DR
Writing an internship cover letter takes six steps: figure out what the employer needs, keep the format professional, open with a clear and specific first line, use projects, clubs and self-taught skills instead of past jobs, show how you'd contribute and what you want to learn, and close professionally and proofread. Keep it to one page, about 250 to 350 words. A strong letter shows how your existing skills meet the employer's needs, even if you've never had a job.
It can feel like you need experience to get experience. What sets a strong high school cover letter apart is that it turns the experience you already have, like a class project or a club role, into evidence for the specific internship. Below you'll find each step, a sample letter for a startup marketing internship and how to follow up.
Applying with a thin resume? See Ladder's guides to applying for an internship with no experience and making extracurriculars sound professional on a resume.
What does an internship cover letter need to do?
A cover letter explains why you want this internship and why you're a promising candidate, adding context your resume can't. Instead of repeating your resume, use it to explain why a specific project matters, what you learned and how you'd apply it.
Employers aren't just reading a list of what you've done; they're working out what you could do next. You don't need to sound like a seasoned professional, just like someone who understands the role and has thought about how to help.
How do you write an internship cover letter in 6 steps?
1. Figure out what the employer actually needs
Read the listing and note the responsibilities, skills and tools it mentions most, then pick about three you can honestly speak to. A marketing intern might research competitors or draft social posts; a software intern might test features or document bugs.
Next, spend a few minutes on the company's website, products and social accounts and find one specific thing that interests you. That's how you answer "why this company?" without generic lines about loving tech or marketing.
2. Keep the format professional
One page, about 250 to 350 words: your name and contact details, the date, the company, a greeting, two or three short body paragraphs and a sign-off. Use a clean font that matches your resume, and address the hiring manager by name if you know it, or "Dear Hiring Manager."
Follow the submission instructions exactly. If they ask for a PDF, name it clearly, like FirstName_LastName_CoverLetter.pdf; if there's a text box, paste it there.
3. Open with a clear, specific first line
Name the internship, say why you're applying and give one genuine connection to the company's work. "I'm interested in how your team explains a technical product to new customers on social media" says more than "I've always wanted to work in marketing."
Two or three focused sentences are enough, and never open by apologizing for being young or inexperienced.
4. Use projects, clubs and self-taught skills instead of past jobs
Experience doesn't have to come from a paid job: a class presentation shows research and communication, a club role shows organization and a personal website or coding project shows initiative. The key is explaining what you actually did, not just naming the activity.
Instead of "I'm a member of the media club," write what you did, such as drafting captions or researching newsletter topics. Include numbers only if you can verify them, and never invent experience.
5. Show how you'd contribute and what you want to learn
Connect your skills to the work the employer needs: if you've written for a school publication, you could help draft content; if you've taught yourself basic coding, you could take on a small task while learning the team's process.
It's fine to say you're still learning. Employers hiring high schoolers know that, and they care more about honest strengths and a willingness to learn than big promises.
6. Close professionally and proofread
Restate your interest, thank the reader and sign off with "Sincerely," and your name. Then check the company and hiring manager's names, fix typos and make sure your examples match the listing.
If you can, let it sit a day and read it aloud, or ask a teacher to review it. Your attention to detail is part of the impression you make.
What does an internship cover letter example look like?
Here's a sample for a startup marketing internship; replace every detail with your own real experience.
> [Your Name] | [Email] | [Phone] | [Date] > > Dear Hiring Manager, > > I am writing to apply for the Marketing Intern position at [Startup Name]. I'm interested in how businesses build an audience and explain the value of their products, and I'm especially curious about how your team approaches [specific product, service or customer problem]. I would welcome the chance to contribute to your marketing team while learning how a startup develops and tests its ideas. > > For a recent class project at [School Name], I researched how different brands speak to their target audiences and presented my findings to my class. Comparing marketing messages showed me how audience, language and visuals shape the way a product is presented. The project strengthened my research and presentation skills, which I'd be excited to use to help your team study competitors or develop content. > > Outside class, I help plan activities and share information with students through [club name]. I've also been teaching myself Canva to create simple graphics. These experiences taught me to pay attention to detail, think about my audience and revise when something could be clearer. > > Although I haven't held a formal marketing role, I'm comfortable learning new tools, working on a team, asking questions and taking feedback. I'd be glad to help with research, content preparation and other tasks that support your goals, and I'm eager to learn how a small team decides which marketing ideas to test. > > Thank you for considering my application. I'd appreciate the chance to discuss how my skills and interest in marketing could support your team. > > Sincerely, > [Your Full Name]
What should you do after you send your cover letter?
If the employer gives a timeline, follow it; otherwise, wait about one to two weeks before sending a short, polite follow-up that names the role and restates your interest. Keep applying elsewhere instead of waiting on one application.
Tailor every letter. Reuse the structure, but change the opening, examples and skills to fit each role, and keep a list of which projects you've used so you can pick the best evidence each time.
Does a cover letter matter for competitive internships?
Yes: when many students apply for a limited number of spots, a clear, specific letter is one of the easiest ways to stand out. It's also practice for college essays, scholarship applications and future jobs.
Many high school programs welcome applicants with no work history. Ladder Internships accepts high school students in grades 9 to 12 worldwide for remote start-up internships, no prior work experience needed.
Common questions about internship cover letters
Do high school students need a cover letter?
Not always. Submit one if it's requested, consider one if it's optional, and skip it if the application says not to.
What if you don't meet every qualification?
Separate required from preferred qualifications. If you meet the essentials, apply, be honest about what you know and don't claim skills you don't have.
Can you use AI to help write a cover letter?
You can use it to brainstorm or check grammar, but rewrite everything in your own words and only include real experiences. Some applications ban AI use, so check the instructions first.
Where can you apply with no work experience?
Try a program designed for high schoolers. Ladder Internships runs remote, eight-week start-up internships for high school students worldwide, at 5 to 10 hours a week, with a company coach and full financial aid available. The next deadline is November 15, 2026, for the Winter I cohort starting December 7, 2026.
Contact us at contact@ladderinternships.com if you have any questions!