How to Write a Cover Letter That Passes ATS

Most candidates spend hours perfecting their resume for ATS and then dash off a generic cover letter -- not realizing that cover letters go through the same automated screening. At companies that collect applications through platforms like Workday, iCIMS, or Taleo, your cover letter is parsed, keyword-scored, and ranked right alongside your resume. A cover letter that ignores ATS requirements can drag down an otherwise strong application.

The good news: writing an ATS-optimized cover letter doesn't mean writing a robotic document. It means making smart structural and keyword choices that let the system read your letter accurately, so that when a recruiter finally opens it, the content is what wins them over. Here's exactly how to do it.

Do ATS Systems Actually Read Cover Letters?

Yes -- when they're submitted through an online application portal. If you upload or paste a cover letter into an ATS platform, it gets parsed just like your resume. The system extracts text, matches it against the job description, and factors it into your overall application score on platforms that weight cover letters.

Not every ATS handles cover letters the same way. Some systems score them, some store them as raw text for recruiters to search, and some just attach them to your application file without parsing. But since you rarely know which system a company uses, the safest approach is to optimize every cover letter as if it will be machine-read first and human-read second. That strategy wins in every scenario.

The Right File Format for ATS Cover Letters

The same file format rules that apply to resumes apply to cover letters. Submit a .docx or a text-selectable PDF. Avoid submitting your cover letter as a scanned image, a .pages file, or an image-heavy PDF exported from a design tool like Canva -- all of these can render as unreadable to an ATS parser.

If the application portal asks you to paste your cover letter into a text field rather than upload a file, that's even better from an ATS standpoint -- plain text is the most parseable format of all. Just make sure your pasted version doesn't rely on any formatting that disappears in plain text (like bold headers for section breaks).

Structure: Keep It Simple and Single-Column

ATS systems expect a linear document. The same formatting mistakes that break resume parsing -- tables, text boxes, multi-column layouts, headers and footers -- break cover letter parsing too.

A clean ATS cover letter structure looks like this:

1. Your name and contact information at the top (in the document body, not the document header)
2. Date
3. Hiring manager's name, title, and company (when known)
4. Opening paragraph -- the role you're applying for and why you're a strong match
5. Two to three body paragraphs -- specific experience and accomplishments relevant to the role
6. Closing paragraph -- call to action and expression of enthusiasm
7. Signature

Use standard paragraph breaks. Don't use decorative separators, colored section headers, or icon bullets. A simple, single-column layout with clear paragraphs gives an ATS the cleanest possible read.

Keywords: The Core of ATS Cover Letter Optimization

Keyword matching is the primary way an ATS scores your cover letter. The system compares the language in your letter against the language in the job description and measures alignment. The higher the match, the better your overall application score.

How to find the right keywords

Read the job description carefully and identify:

• The job title itself -- use the exact title from the posting at least once (e.g., "Senior Product Manager," not "senior PM")
• Required skills and tools -- if the posting lists "Salesforce CRM," use that exact phrase, not just "CRM software"
• Industry-specific terms -- certifications, methodologies, and technical terms that appear multiple times in the posting carry more weight
• Action-oriented phrases from the responsibilities section -- if the job says "lead cross-functional teams," mirror that language in your letter

You don't need to stuff keywords unnaturally. The goal is to write a letter that sounds professional while naturally incorporating the language the employer used to describe the role. If you need help identifying which keywords to prioritize, this guide on ATS keywords by industry is a good starting point.

Spell out abbreviations

ATS parsers don't always recognize abbreviations. Write "Search Engine Optimization (SEO)" the first time, then use "SEO" after that. The same applies to certifications: "Project Management Professional (PMP)" rather than just "PMP." This ensures the system captures the keyword regardless of how it was entered in the matching database.

Length and Density: What ATS Systems Prefer

Keep your cover letter to three to four paragraphs, roughly 250-400 words. This length is optimal for two reasons: it gives you enough room to hit the important keywords without redundancy, and it respects a recruiter's time when they do read it.

Avoid very short cover letters (under 150 words) -- they often don't contain enough keyword density to score well. Avoid very long letters (over 600 words) -- they dilute keyword relevance and increase the chance that critical terms are buried too far down to count in some scoring models.

Every paragraph should advance a specific point: why you're qualified, what you've accomplished that's relevant, and why this company and role. Avoid filler phrases like "I am very excited to apply" or "Please find my resume attached." These consume word count without contributing keywords or evidence.

The Opening Line: Make the Role Clear Immediately

The first sentence of your cover letter should state the role you're applying for. Many ATS platforms use the opening of the cover letter to confirm job-title matching. A strong ATS-optimized opener sounds like this:

"I am applying for the Senior Data Analyst position at Acme Corp, where I will bring five years of experience in SQL-based reporting, Python data pipelines, and cross-functional analytics strategy."

This single sentence contains the job title, the company name, and three specific keywords from a hypothetical data analyst job description. It's also human-readable and confident -- which is exactly what you want when a recruiter opens the file.

Tailoring for Every Application

A generic cover letter is the fastest way to score poorly in ATS. The system is comparing your letter against a specific job description -- the more your language mirrors that description, the higher your score. A letter written for a different job, or a "template" letter with only the company name swapped out, will score significantly lower than a tailored one.

The minimum tailoring that makes an ATS difference: update the job title in your opening, add three to five keywords from the specific posting, and adjust one accomplishment in your body paragraphs to match the primary responsibility listed in that job description. This takes about ten minutes per application and meaningfully improves your ATS match rate. For a full tailoring framework, see our guide on how to tailor your resume for each job application -- the same principles apply to cover letters.

Final Thoughts: ATS Is the First Audience, Not the Last

An ATS-optimized cover letter isn't a compromise -- it's a smarter version of the cover letter you were going to write anyway. The discipline of including specific keywords, spelling out abbreviations, and matching the employer's language makes your cover letter clearer and more relevant for human readers too.

The candidates who get interviews are the ones whose applications score well enough to land in a recruiter's review queue. Your cover letter is part of that score. Treat it with the same keyword discipline you'd apply to your resume, and you'll clear the ATS filter consistently.