Opening with a generic, forgettable line
Lines like I am writing to apply for the position of Marketing Manager waste the most valuable sentence in the letter restating information the reader already has from the application itself. The fix is simple: open with a specific fact, result, or connection instead of a formality.
Leaving in details from a previous application
One of the fastest ways to get an application discarded is a cover letter that references the wrong company name or job title, left over from reusing a template without fully updating it. This mistake signals carelessness more loudly than almost anything else in the application, precisely because it is so avoidable. Always do a final read specifically checking every instance of the company name and role title before sending.
Restating the resume instead of adding to it
A cover letter that repeats resume bullet points in paragraph form wastes the reader's time twice over. The letter should explain why those facts matter or provide context the resume format cannot hold, not simply reformat the same information into sentences.
Focusing entirely on what you want, not what the employer needs
A letter built around phrases like this opportunity would help me grow or this role fits my career goals centers the candidate's needs over the employer's. Reframe each of these statements around what you can contribute, since the hiring manager's primary question is what you will do for their team, not what the role will do for you.
Other errors worth catching before you send
- Excessive length: anything past one page usually needs to be cut, not just formatted smaller.
- Overly formal or stiff language that does not sound like an actual person wrote it.
- Vague claims with no evidence, such as claiming to be a team player without a supporting example.
- Typos and grammatical errors, which are easy to miss when reading your own writing repeatedly, so read it aloud or have someone else check it.
- A closing that is either too passive, such as simply saying thank you for your consideration with nothing else, or too aggressive, such as demanding a call by a specific date.
The risk of an obviously AI generated letter
Using AI tools to help draft a cover letter is common and not inherently a problem, but submitting the output unedited often produces a letter with a recognizable, generic tone, filled with broad statements and little specific detail about the actual company or role. Hiring managers who read many applications increasingly notice this pattern. Whatever tools you use in drafting, make sure the final version includes specific facts about you and the company that a generic draft could not have generated on its own.
A tone that does not match the company or role
An overly casual letter sent to a formal, traditional organization, or an overly stiff, corporate sounding letter sent to a small, informal startup, both create a subtle mismatch that can work against you. Read the job posting and, if possible, the company's own public communications to get a sense of the appropriate register, and adjust your tone to sit comfortably within that range rather than assuming one tone fits every application equally well.
Treating every application as identical
Applying to a large number of roles quickly can tempt candidates into sending the exact same letter everywhere with only the company name changed. Beyond the risk of leftover details, this approach usually produces a letter that is vague enough to technically apply anywhere, which is precisely the quality that makes it forgettable to any single reader. Even a few minutes of genuine customization per application, focused on the two or three most emphasized requirements in that specific posting, meaningfully improves the letter's effectiveness.
Skipping the read aloud step
Silent proofreading catches spelling errors but often misses awkward phrasing, run-on sentences, or a tone that does not sound like natural speech. Reading the letter aloud, even quietly, surfaces these problems quickly because your ear catches what your eye skips past on a silent read. This single habit catches more real issues than an additional silent read-through usually does.
A short routine worth building before every submission
Before sending, confirm the company name and role title are correct throughout, read the letter aloud once, check that the file is named clearly and attached in the right format, and glance at the letter and resume side by side to confirm they tell a consistent story. This takes only a few minutes but catches the overwhelming majority of the mistakes covered here, turning a good draft into a genuinely polished submission.
Building this into a habit rather than a one time fix
The value of catching these mistakes compounds over a job search, since a strong, error free letter improves every application it is used for, not just one. Building a short, repeatable pre-send checklist into your process means each new letter starts from a higher baseline, rather than relying on catching the same mistakes fresh every single time.
The underlying theme across all of these mistakes
Nearly every mistake covered here comes down to the same root cause: treating the letter as a formality to get through rather than as a real piece of persuasive writing aimed at one specific reader. Fixing that underlying mindset tends to fix most of the individual symptoms on its own.
Before sending any letter, it can help to ask one final question: if I were the hiring manager, would this letter make me want to meet this person. If the honest answer is no, that is a sign to revisit the draft rather than submit it as is, even if it means missing an application deadline by a day to get it right.