A cover letter is usually not necessary in the strict sense: on most application forms we checked, the cover letter field is optional, and some forms do not have one at all. It is necessary when the form marks it required or the posting asks for one in writing. In between those two cases, a short letter written for that specific job is the part of the application most likely to help, and a generic one is the part most likely to be ignored. The useful question is not whether cover letters are dead but whether this particular application gives you a reason to write one.
No reliable public statistic answers the question for every job, and most of the numbers quoted on this topic trace back to resume vendors. So this post leans on what the application forms themselves do, two recent academic studies, and one vendor experiment labeled as such.
The short answer
| Situation | Do you need one? |
|---|---|
| The form marks the cover letter field required | Yes. The application is incomplete without it |
| The posting text asks for a letter or names questions to answer | Yes, treat it as required even if the field is not |
| The field is optional and a person will read it | Worth writing, if it says something specific |
| You are changing fields, returning from a gap, or have a referral to name | Worth writing, because the resume cannot explain it |
| There is no cover letter field anywhere | No |
| The letter would be generic | Skip it and spend the time on the next application |
When the form requires one
Start with the form, because it settles the question faster than any advice column.
Greenhouse, one of the most widely used applicant tracking systems, treats the cover letter as a standard application question. Its job board API documentation shows it accepted either as an uploaded file or as pasted text, and each question on a job's form carries its own required flag.
To see how employers actually set that flag, we pulled the application questions for five current postings at each of 18 large employers that host their jobs on Greenhouse, through the public Greenhouse job board API, on 17 October 2026. Of those 90 postings:
| Cover letter field | Postings |
|---|---|
| Present and optional | 77 |
| Not on the form at all | 11 |
| Required | 2 |
Both required postings were at Airbnb, for account management and business development roles. This is a small sample of mostly technology employers, not a measure of the whole market, but it matches what you see filling in forms: the cover letter is usually offered and rarely demanded.
Lever, another common system, does not have a separate cover letter upload on its standard form. Its application page ends with an Additional information box whose placeholder reads "Add a cover letter or anything else you want to share." It is optional.
Two things make a letter required even when the field is not:
- The posting asks for one. A line in the job description such as "include a cover letter explaining your interest" is an instruction. A recruiter who wrote it will notice its absence, whatever the form allows.
- The posting names questions to answer. Some employers ask candidates to address something specific, such as why this team, or a particular project. If the form has no separate question for it, the letter is where the answer goes.
A required field marked with an asterisk will usually stop you from submitting without it. A required instruction buried in the posting will not, which is why it is worth reading the posting to the end.
When it can help
When the letter is optional, its value depends on whether a person will read it and whether it says something your resume cannot.
The first condition is often met. Greenhouse tells candidates that applications in its system are "by and large" reviewed by real people, one by one, and that reviewers see "your resume, cover letter, answers to questions on the application form" together. An optional letter is not thrown away by the software. Whether the reviewer reads past the first line is up to the letter.
The second condition is where the letter earns its place. A resume is a list of facts. It is bad at explaining:
- A career change. Why someone with five years in retail operations is applying for a supply chain analyst job, and which parts of the old work carry over.
- A gap. A sentence on what you were doing, so the reader does not have to guess.
- A referral. The name of the person who suggested you apply, in the first line.
- A specific reason for this employer. Something you know about the team's work that a generic applicant would not.
- A move. That you are relocating to the job's city, and when.
On whether optional letters change outcomes, the most cited evidence is a vendor study. ResumeGo, a resume writing company, sent 7,287 fictitious applications to postings on ZipRecruiter, Glassdoor and Indeed between July 2019 and January 2020, split between no cover letter, a generic letter and a letter tailored to the job. Applications with a tailored letter got a 53% higher callback rate within 30 days than applications with no letter. The same company surveyed 236 recruiters and hiring managers: 87% said they read cover letters, and 81% said they valued tailored letters significantly over generic ones. The company sells resume services, the experiment ran before AI writing tools were in common use, and no outside group has replicated it, so read the numbers as a direction, not a forecast.
How AI changed the value of a cover letter
Two recent academic papers looked at what happens to cover letters when writing them becomes cheap, and both are worth knowing before you hand the job to a chatbot.
Jingyi Cui, Gabriel Dias and Justin Ye studied an AI cover letter tool launched on a large online labor platform. In their paper, access to the tool made letters more closely matched to the job post and raised callback rates. Time spent editing the AI draft was positively correlated with hiring success. But after the tool launched, the link between how well a letter matched the posting and whether the applicant got a callback fell by 51%, and employers leaned more on other signals, such as applicants' prior work histories.
Anaïs Galdin and Jesse Silbert reached a similar conclusion from about 2.7 million proposals on Freelancer.com. In "Making Talk Cheap", employers had a high willingness to pay for workers with more customized applications before ChatGPT, and much less after. Both papers are working papers on freelance platforms, not peer-reviewed studies of corporate hiring.
The practical reading is simple. A letter that only echoes the posting's wording is now easy for everyone to produce, so it tells the reader little. A letter that says something only you could say, such as a specific project, a number from your own work or a reason that applies to this team and no other, still does.
When to skip it
Skipping the letter is the right call more often than career advice admits.
- There is no field. In our Greenhouse sample, 11 of 90 postings had no cover letter question at all. An employer that removed the field has told you what it wants.
- The posting says not to send one. Follow the instruction.
- The letter would be generic. "I am excited to apply for this role at your company" adds nothing a reader can use, and the research above suggests matched-but-empty letters carry less weight than they used to.
- The time is better spent elsewhere. If writing a real letter takes as long as tailoring the resume for another posting, and the field is optional, the second application may be worth more. Our post on whether to tailor your resume for each job covers that time trade.
- One-click applications. Quick-apply flows that send a stored profile often have nowhere to put a letter.
Skipping an optional letter does not make an application incomplete. Leaving a required one out does.
A short letter that works
A good letter is short: three paragraphs, well under a page, written for one posting. It does not repeat the resume. It points at the two or three parts of the resume that matter most for this job and adds the context the resume cannot carry. For word counts by situation, see how long a cover letter should be.
Here is a structure, with an example for an invented posting and an invented candidate:
- Opening: the role and the connection. Name the job. If someone referred you, name them here.
- Middle: two pieces of evidence. Pick the two requirements the posting stresses most and give one specific example for each, with a real number where you have one.
- Close: why this employer, and what happens next. One sentence on why this team, and a plain sign-off.
Dear Hiring Team,
I am applying for the Operations Analyst role at Harbor Lane Logistics. Dana Ortiz on your carrier management team suggested I reach out.
Your posting puts on-time delivery and carrier costs at the center of the job. At Brightwater Distribution I built the Tableau dashboards our fulfillment team uses to track on-time delivery by region, and I audited carrier invoices that recovered $48,000 in billing errors in 2024. Both started as questions from managers that nobody had the data to answer, which sounds like the work you describe.
I would like to do the same for a network of Harbor Lane's size, and I would welcome a conversation about the role.
Sincerely, Sam Patel
Every company, person and number in that letter is made up. Notice what it does: it uses the posting's own terms (on-time delivery, carrier, Tableau), it names a referral early, and its two numbers are the same ones on the candidate's resume. A cover letter is part of your application record, so its facts have to match the resume exactly. For more samples by situation, each shown beside its posting, see our cover letter examples.
Tailoring a cover letter
If you tailor your resume for a posting, tailor the letter from the same reading of the posting. The steps in our guide to tailoring a resume give you the posting's requirements in its own words, and the letter's middle paragraph is where the top two go. The opening line of a good resume summary is often a usable first sentence for the letter, rewritten in the first person. The full method, paragraph by paragraph, is in our guide on how to write a cover letter.
Three checks before sending:
- The facts match the resume. Employers, titles, dates and every number.
- The company name is right. A letter reused from another application with the wrong employer in it is worse than no letter.
- It says one thing a generic applicant could not. If it does not, consider skipping it.
The same habit of short, specific writing carries through the rest of the process, including the thank you email after an interview.
Where ApplyEze fits
ApplyEze writes a resume for every posting it applies to, and a cover letter when the form asks, as PDF and DOCX, and reads each file back with a parser check before upload. The letter is written for the same posting as the resume. As with any tool, read what it wrote before it goes out under your name.