8 Cover Letter Mistakes You Should Avoid

The most damaging cover letter mistakes are sending a generic opening, repeating your resume, making claims without evidence, naming the wrong company or role, writing too much, leaving AI-generated language unedited, using hard-to-read formatting, and ending without a clear next step. A strong letter does not need ornate prose. It needs a clear connection between the employer’s problem and evidence that you can help solve it.

Use the eight corrections below as an editing workflow. Each section shows why the mistake weakens an application, a short bad example, and a better version. If you need help building the full document from the beginning, our Tech Cover Letter Guide covers structure, research, and role-specific writing in more detail.

When is a cover letter worth submitting?

Write one when the employer requests it, when the application gives you a useful place to add it, or when context would make your qualifications easier to understand. A cover letter is especially useful for a career change, an unusual path, a referral, a strong connection to the company’s work, or an achievement that needs more explanation than a resume bullet can provide.

If the letter is optional and you have nothing specific to add, a rushed generic document may not help. Spend the time on a strong resume and complete application instead. Always follow explicit employer instructions: submit the requested file type, answer any prompts, and respect stated length limits. An optional letter should add information, not exist merely to fill an upload field.

1. Opening with a generic introduction

Why it fails: A sentence that could introduce any applicant for any role gives the reader no reason to continue. Enthusiasm is easy to claim. A useful opening names the position, identifies a relevant strength, and starts connecting that strength to the employer’s need.

Bad example: “I am writing to express my interest in the position at your esteemed company. I believe I would be a great fit and am excited to apply.”

Corrected example: “I’m applying for the customer operations associate role because my campus support work taught me how to diagnose recurring user issues, document clear fixes, and improve a process after feedback.”

The corrected version is not flashy. It gives the reader a role, a relevant setting, and three concrete behaviors the rest of the letter can prove. Replace every detail with your actual experience and the language of the posting.

2. Repeating the resume instead of adding evidence

Why it fails: A hiring team already has your resume. Copying job titles and bullets into paragraphs makes the cover letter longer without adding meaning. Use the letter to explain one or two connections: why an accomplishment matters for this role, how you approached a problem, or why a transition makes sense.

Bad example: “I was a marketing intern at Northwind. I created social posts, analyzed engagement, and supported campaigns. I also served as communications chair for a student organization.”

Corrected example: “While supporting a campus campaign, I noticed that registration questions were being answered differently across channels. I created a shared response guide and reviewed the most common questions each week, which gave the team a consistent way to help prospective attendees. That same mix of audience analysis and process improvement matches the community role’s focus on member support.”

The better version turns listed duties into a small problem, action, and relevant outcome. Our ATS Resume Guide explains how the resume should present concise evidence; the cover letter can then add the context that would not fit in a bullet. Once the evidence is clear, the Simplify Resume Builder gives you a clean place to align the underlying resume with the story you chose to tell.

3. Making unsupported claims

Why it fails: Words such as “hardworking,” “innovative,” and “excellent communicator” are conclusions, not proof. Anyone can use them. Unsupported superlatives can also sound inflated, particularly when the rest of the letter gives the reader nothing to evaluate.

Bad example: “I am an exceptional leader and creative problem-solver who always exceeds expectations.”

Corrected example: “When two volunteers left a week before our event, I divided the remaining work into daily priorities, confirmed ownership with each teammate, and adjusted the event schedule so the team could complete the required setup.”

This example demonstrates leadership through decisions and coordination. Add a result only when you can verify it. If you do not have a reliable number, describe the completed work, feedback, decision, or change in process rather than inventing a metric.

Review every adjective in your draft. Ask, “What did I do that proves this?” Keep the action and remove the label when the evidence already makes the quality clear.

4. Using the wrong company, role, or personalization

Why it fails: Incorrect names and copied company details suggest that the letter was reused without review. A more subtle version of the same mistake is fake personalization: praising a company’s “mission and values” without naming anything related to the job.

Bad example: “Dear Acme Hiring Manager, I am excited to apply for the product analyst role and support your mission to change the world.” The actual application is for a business analyst role at another company.

Corrected example: “Dear Data Operations Hiring Team, I’m applying for the business analyst role. Your posting emphasizes resolving reporting gaps with finance and operations partners, which closely matches my experience documenting inconsistent definitions in a student consulting project.”

Confirm the legal company name, team, position title, location, and hiring contact when known. If you cannot identify a person, “Dear Hiring Team” or “Dear [Function] Hiring Team” is clearer than guessing. Company research can also reveal a genuine employee connection. Use the Job Referral Guide if you plan to request an introduction; a referral is a distinct channel, not a name to mention without the person’s permission.

5. Writing a letter that is too long

Why it fails: Excessive background forces the reader to search for your strongest evidence. Long letters often repeat the resume, explain every career decision, or include details that do not affect fit. The goal is not to tell your complete professional history. It is to make the case for the target role easy to follow.

Bad example: “Ever since I was young, I have been interested in technology. In high school I joined several clubs, and during college I took many classes that helped me grow. I have always wanted to work for an innovative organization where I can use all of my skills.”

Corrected example: “My coursework in database systems led me to build a scheduling tool for a campus lab. Interviewing the lab coordinator, revising the data model, and documenting the handoff gave me experience that fits this role’s focus on internal tools.”

Aim for a concise letter that a person can scan comfortably, often three or four short paragraphs on one page. Treat that as an editing target, not a universal rule. Follow the employer’s directions when it provides a word, page, or prompt-specific limit. Cut any sentence that does not clarify motivation, evidence, relevance, or the requested next step.

6. Submitting unedited AI-generated writing

Why it fails: An AI-generated draft may sound polished while inventing facts, exaggerating fit, repeating the job description, or using a voice that does not sound like you. It may also expose personal or confidential information if you paste sensitive material into a tool without reviewing what you share.

Bad example: “As a results-driven visionary with a proven track record of leveraging synergistic solutions, I am uniquely positioned to revolutionize your team’s strategic objectives.”

Corrected example: “In my operations internship, I mapped a recurring handoff problem and tested a shared checklist with the two teams using it. I would bring that same practical approach to the process-improvement work described in this role.”

Use AI as an editor or brainstorming partner, not as the owner of your experience. Remove names, contact information, employer-confidential material, customer data, unpublished work, and anything covered by an agreement before sharing text. Give the tool only facts you can verify, and instruct it not to add metrics, skills, outcomes, or company claims.

• Draft the core example yourself so the facts and ownership begin with you.
• Ask for feedback on clarity, repetition, and missing evidence rather than a fictional “perfect” letter.
• Check every company fact against a current primary source.
• Replace generic phrases with language you would naturally use in an interview.
• Read the final version aloud and confirm that you can discuss every claim.

7. Using weak formatting or skipping proofreading

Why it fails: Dense paragraphs, inconsistent fonts, tiny text, broken links, and obvious errors make the document harder to read. Formatting cannot rescue weak evidence, but poor presentation can hide strong evidence or signal that the application was not checked.

Bad example: A six-point font letter uses multiple colors, has no paragraph breaks, addresses “Manger,” and includes a portfolio link that returns an error.

Corrected example: A readable font and size, normal margins, three or four short paragraphs, consistent spacing, the correct recipient and role, and links tested in the final exported file.

Proofread in more than one mode. Read once for meaning, once for names and details, and once for spelling and punctuation. Then inspect the PDF or requested file type rather than assuming the editor preview matches the uploaded result. Check that line breaks, special characters, hyperlinks, and the filename survived export.

A second reader can help, but give that person a focused request: “Please flag any claim that lacks evidence, any sentence that feels generic, and any name or role detail that may be wrong.” Specific review produces more useful feedback than asking whether the letter is “good.”

8. Ending without a clear next-step close

Why it fails: A letter that stops after the evidence can feel unfinished. The close should restate interest, connect the evidence to the work, and make it easy to continue the conversation. It should not demand an interview or make exaggerated promises.

Bad example: “I know I am the best candidate and look forward to receiving an interview invitation soon. Thank you in advance.”

Corrected example: “I would welcome the opportunity to discuss how my experience improving support workflows could contribute to the customer operations team. Thank you for considering my application.”

Keep the close to one or two sentences. “Sincerely,” or “Best,” followed by your name is enough unless the employer gives another format. Avoid adding new evidence in the last line; the close should complete the argument you already made.

Final cover letter correction checklist

Before uploading the letter, check the final file against the application and job description:

• Company: The organization, team, and any referenced product or initiative are correct.
• Role: The job title and location match the posting.
• Opening: The first paragraph names the role and introduces relevant evidence.
• Evidence: Every important claim is supported by a truthful example you can discuss.
• Relevance: The letter adds context instead of copying resume bullets.
• Length: The document is concise and follows any stated limit.
• Formatting: Paragraphs, spacing, font, margins, and exported pages are readable.
• Names: The recipient, company, role, and your own contact details are spelled correctly.
• Links: Portfolio, LinkedIn, and other included URLs open to the intended public pages.
• AI review: No invented fact, confidential detail, generic filler, or unnatural phrasing remains.
• Close: The final lines express interest and invite a conversation without making demands.
• Filename: Use a clear name such as First-Last-Cover-Letter.pdf unless instructed otherwise.

A useful cover letter is specific, evidence-led, and easy to verify. Correct these eight mistakes, follow the employer’s instructions, and submit a document that sounds like you can explain every sentence in an interview.