ATS-Friendly Cover Letters: How to Pass the Robot and Impress the Human

An ATS extracts text from your cover letter, tokenizes it into keywords, and scores it against the job requisition using keyword matching, semantic similarity, and contextual relevance. According to Jobscan (2024), 98.2% of Fortune 500 companies use ATS software to filter applications. CareerBuilder (2024) reports that 75% of large employers rely on ATS as their primary screening method before a human ever reviews the application.

The scoring typically works in three layers:

1. Exact keyword match — Does your letter contain the same terms as the job posting?
2. Semantic similarity — Do you use related concepts (e.g., "machine learning" and "ML models")?
3. Contextual relevance — Are the keywords used in meaningful context, or just listed?

According to iCIMS (2024), ATS-filtered applications have a 68% rejection rate at the automated screening stage — meaning most candidates never reach a human reviewer. This makes your cover letter's keyword strategy a critical gating factor.

Treat the ATS like a keyword-matching machine

Naturally incorporate 60-70% of key terms from the job posting by using exact terminology in context. According to NACE (2025), 56% of employers rank relevant keywords as the single most important factor in cover letter screening — more important than formatting or length.

1. Read the job posting carefully. Identify the 5-7 most important requirements — these are usually listed first or repeated.
2. Use exact terminology. If they say "cross-functional collaboration," use that phrase, not "working with different teams."
3. Contextualize every keyword. "I led cross-functional collaboration between engineering and design to ship the v2.0 redesign in 8 weeks" — the keyword is embedded in a real example.
4. Include the exact job title as written in the posting.
5. Mirror their soft skill language. If they want "strong communicator," use "strong communicator."

CareerBuilder (2024) found that applicants who mirror the exact language of the job description are 40% more likely to advance past the initial screen. Above 80% keyword match starts to feel forced. Below 50% means you are not addressing enough requirements.

Match their words, but make them yours. The ATS wants keywords; the hiring manager wants context. Give both of them what they need.

Use a single-column layout, standard fonts, 10-12pt size, and save as PDF. Avoid tables, text boxes, images, and multi-column layouts that ATS parsers cannot read. According to Greenhouse (2024), clean formatting reduces parsing errors by up to 60% compared to complex layouts.

Do:

• Use standard fonts (Times New Roman, Arial, Calibri)
• Use clear section breaks (blank line between paragraphs)
• Keep margins at 1 inch
• Use 10-12pt font size
• Use left alignment (not justified)

Do not:

• Use tables, text boxes, or multi-column layouts
• Embed images or logos
• Use headers or footers for essential content (some parsers skip these)
• Use uncommon file formats (.pages, .odt, .rtf)
• Put your name and contact info in a text box

The key principle is simplicity. The more complex your formatting, the more likely the ATS will misparse your content. A cleanly formatted letter that scores well on keywords will always outperform a beautifully designed one that the parser cannot read. For general formatting and length guidance, see how long should a cover letter be.

Each major ATS platform has different parsing behavior. Understanding these differences can prevent your cover letter from being misread or discarded.

Workday: Strict formatting requirements. DOCX often parses better than PDF. Keep formatting minimal — no columns, no text boxes, no images. According to iCIMS (2024), Workday is used by 50% of Fortune 500 companies, making it the most common enterprise ATS.

Taleo (Oracle): One of the oldest ATS platforms. Very literal keyword matching — it does not understand synonyms well. Use exact phrases from the job posting.

Greenhouse: More modern parsing engine. Handles PDF well. Greenhouse (2024) data shows their parser correctly extracts 95% of standard-format documents. Primarily focused on resumes but does index cover letter content for search.

iCIMS: Medium strictness. Supports both PDF and DOCX. Increasingly uses AI-assisted screening that evaluates contextual relevance, not just keyword presence.

Lever: Lightweight cover letter parsing. Your resume carries more weight, but the cover letter is always visible to human reviewers once you pass the initial screen.

Check your keyword match score by searching for the top 10 job posting terms in your letter. Aim for at least 6-7 present in natural context. According to NACE (2025), employers consistently rank keyword relevance above all other cover letter factors during the screening stage.

1. Manual check: List the top 10 keywords from the job posting. Ctrl+F each one in your cover letter. You want at least 6-7 present.
2. Use an ATS scoring tool. Tools like LetterShot include built-in TF-IDF scoring that shows you exactly which keywords you hit and which you missed, with an overall compatibility score from 0-100. Try our free ATS checker to test your letter.
3. Read it as a human. After optimizing for ATS, read the letter out loud. If it sounds like a keyword salad, you have gone too far.

CareerBuilder (2024) reports that candidates who test their applications against the job description before submitting receive 30% more interview callbacks than those who do not.

Five minutes of keyword checking saves weeks of silence. Every cover letter should be tested against the job description before you hit submit