Most applications today land in an applicant tracking system (ATS) that processes resumes before a human sees them. Cover letters attached to a “not required” field often get ignored or, worse, read as desperate. Recruiters I've spoken to say that unsolicited cover letters feel like extra noise unless the candidate has a clear reason to write.
The real risk: you waste the 15–20 minutes it takes to customize a letter on a submission that already has a 2–3% chance of landing an interview. That time is better spent tailoring your resume's bullet points to match the job's required skills.
If a current employee—especially one in the hiring team or a direct peer—agreed to refer you, write a cover letter that mentions them by name in the first sentence. Example:
“Jane Chen in your Product Design team suggested I apply for this role. We worked together at Acme Corp on two product launches, and she thought my experience in cross-functional stakeholder management would fit your team's current needs.”
This gives the recruiter a reason to read further: a trusted employee already vouched for you. Without this, skip the letter.
If you spent the last 18 months caring for a family member, or you are moving from K–12 teaching to corporate training, a two-sentence explanation in a resume bullet can sound defensive. A cover letter lets you frame the story proactively:
“After a career break to manage a relocation, I am now fully available and eager to apply my project management skills from the non-profit sector to your operations team. I have rebuilt workflows for three organizations from scratch and can do the same for your client onboarding process.”
Keep it to 3–4 lines. Do not apologize—just state the context and immediately pivot to what you bring.
When your last job title was “Administrative Assistant” but you performed data analysis (SQL, dashboards, reporting) that matches the analyst role you want, the ATS may not surface your resume because it does not see the keyword “analyst.” A cover letter can bridge the gap:
“Although my current title is Administrative Assistant, I have spent the past two years building Tableau dashboards for 12 departments and reducing report generation time by 40%. I am applying to the Data Analyst role because that work is the core of what I do daily.”
Use this exact 4-sentence structure. Keep it to 5–7 lines total—do not exceed half a page.
Example (for a marketing role at a SaaS company that just launched a new feature):
“I am applying because I have followed your recent expansion into the healthcare vertical and believe my background launching B2B campaigns at a similar stage would be useful. At my last company, I increased trial-to-paid conversion by 25% within four months of the feature launch—from 8% to 10%—by rewriting onboarding emails for two segments. Your new patient-scheduling tool targets small clinics that are notoriously slow to adopt new software, and I have tested segmentation strategies specifically for that audience. I have attached my resume and welcome the chance to discuss how I could help accelerate adoption.”
Even if no one requests a cover letter, the ATS may still scan the document you upload. Keep it plain: no images, no tables, no colored headers. Use a standard font like Arial or Calibri at 11pt. Save as PDF unless the application portal specifies .docx (PDF preserves your layout and is universally readable). If you attach it to the same field as your resume, label it clearly: “Jane_Doe_Cover_Letter.pdf”.
Usually no. Optional fields exist for the three cases listed above. If you do not fit one of those cases, skip it—recruiters rarely read optional letters and your resume is stronger alone.
5–7 lines maximum. If you need more than that to explain your case, your resume probably needs restructuring instead of a letter.
Only if you have a new piece of information, such as a referral who just agreed to recommend you or a recent accomplishment relevant to the role. Send it in an email to the recruiter with a subject line like “Application for [Role] – additional context”. Otherwise, do not follow up with a letter.
Combine your resume and cover letter into a single PDF. Place the cover letter on page 1, then the resume on page 2. Use a header on the cover letter with your name and contact info so the ATS can still parse it.
Before you send that letter, run your resume through a free checker to catch formatting issues that could hide your best bullets from the ATS: Check your resume at PrismResume
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