How to write a co-op cover letter in Canada

Do you need a cover letter for a co-op application?

If the posting asks for one, yes. If it does not, check your school's rules, because they differ. At the University of Waterloo, a letter is optional on WaterlooWorks unless the posting says otherwise, and the school suggests putting your effort into the jobs you care about most.

When you do send one, write it for that job. Canada's Job Bank says a cover letter should be concise, well written and tailored to the company and the job, and that you may need a different one for each job.

What goes in a co-op cover letter?

Five parts, in this order, on one page. This follows the outline from alis, the Government of Alberta's career service.

1. Header and subject line

Your contact details, the date, then the employer's. Add the job title and the posting number. The Ontario Public Service student tip sheet asks for both in the subject line, which helps on co-op portals where every posting has an ID. Sending by email? The email's subject line does this job.

2. Greeting

Use a real name if you have one. If not, alis suggests "Dear Hiring Manager" or "Dear [Company] Team". Waterloo tells students on WaterlooWorks to write "Dear Recruiter" or "Dear Hiring Manager". Skip "Sir or Madam".

3. Opening paragraph

Name the job, then give one specific reason you want it. UBC Science Co-op advises against generic openers and suggests tying your interest to a real detail about the company. Spend a few minutes on the employer's website first.

4. One or two proof paragraphs

This is the letter's main job. UBC suggests starting each paragraph with the skill or experience it will show. Alis says to link your skills to the posting's requirements and leave the details for the CV.

5. Closing

Say your CV is attached, ask for an interview, and give a phone number. End with "Sincerely," and your name. A digital letter needs no signature.

How do you match the letter to the posting?

Choose the requirements first, then find your proof. Writing in that order keeps the letter short and specific.

1. Pick two or three requirements. Take the ones the posting repeats or lists first.
2. Find one true proof for each. A course project, a lab, a team assignment, a volunteer role or a student job all count. Alis lists work, training, volunteer and school experience as relevant.
3. Write what you did and what came of it. The Ontario tip sheet asks for detailed examples of where you gained and showed each skill. A number helps only if it is real.
4. Use the employer's terms, not their sentences. Alis says to work the posting's skills into your letter, and also warns that copying the ad's wording makes you look unoriginal. Say "data analysis" if you did data analysis, in a sentence of your own.
5. Cut what the posting does not ask for. UBC says unrelated details lower a hiring manager's interest.

For the resume that goes with it, see our guide on tailoring a co-op resume.

What does a co-op cover letter look like?

Here is the middle of a letter for a made-up student applying to a software testing role. Swap in your own facts: nothing here should stay if it is not true for you.

I am applying for the QA Co-op Student position (posting 123456). I use [Company]'s app to [real use], and your recent post about [real detail] is why this role stands out for me.

Your posting asks for test writing in Python. In my software engineering course, I wrote the automated tests for my team's web app and ran them before each release, which caught [real bug] before our demo.

You also ask for clear communication. As a campus help desk assistant, I turned student reports into tickets the technicians could act on, and I wrote the short guide we gave new staff.

My CV is attached. I would be glad to meet and can be reached at [phone number].

What mistakes should you avoid?

Most weak letters are too general, too long or unchecked.

• Sending the same letter everywhere. Alis says to tailor each letter to its job.
• Repeating your CV. Pick the proof that matters and let the CV carry the rest.
• Going past one page. Alis and UBC both set one page as the limit.
• Starting every sentence with "I". Alis suggests keeping those to a minimum, with short paragraphs and plain language.
• Mismatched files. Alis suggests using the same font as your CV.
• Skipping the proofread. Check spelling and grammar, and have someone else read it.
• Claiming what you cannot back up. Whatever you write, you may be asked about in the interview.

International student: do you need a co-op work permit?

Eligible post-secondary students no longer do. IRCC says that since April 1, 2026, they do not need a co-op work permit for a placement their program requires, as long as they meet conditions such as a valid study permit, full-time enrolment and a placement that makes up 50% or less of the program. Secondary students still need one. Check your own case with IRCC or your school's international office.

Frequently asked questions

Do I need a cover letter for every co-op posting?

Write one whenever the posting asks for it. Rules differ by school: on WaterlooWorks, for example, a letter is optional unless the posting says otherwise. When you do send one, tailor it: Canada's Job Bank says you may need a different letter for each job.

How long should a co-op cover letter be?

One page. Alberta's alis service says one page at most, and UBC Science Co-op says the same. Ontario's student tip sheet allows up to two pages, but a first co-op letter rarely needs more than one.

Who do I address it to if the posting gives no name?

Use "Dear Hiring Manager" or "Dear [Company] Team", as alis suggests. Waterloo tells co-op students on WaterlooWorks to use "Dear Recruiter" or "Dear Hiring Manager". Avoid "Dear Sir or Madam".

What do I write if this is my first co-op and I have no experience?

Use what you have: course projects, labs, team assignments, volunteering and student jobs. Alis counts work, training, volunteer and school experience as relevant. Name what you did, how you did it and what came out of it.

Should I mention my study permit or work authorization?

Only if the posting asks. If it does, answer truthfully and check your own situation with IRCC or your school's international office. Otherwise, spend the page on what you can do for the employer.

Can I use an AI tool to write my cover letter?

Yes, as long as every claim is true and the letter still sounds like you. Alis warns that AI can get facts wrong or link your experience to a job in ways that do not make sense, so check each line. CVScriba, for example, writes from the CV you give it, without inventing jobs or numbers, and you review it before sending.