A cover letter that could be sent to any company gets treated like it was. The fastest way to write one that feels written for this employer is to spend 15 minutes learning about them before you type a word. You are not writing a research paper, you are looking for two or three specific hooks.
What you are actually looking for
You need enough to answer one question convincingly: why this company, not just any company in the field. That answer usually comes from one of a few places: something they recently did, a value or way of working they describe, or a problem they are clearly trying to solve in the role you want.
You do not need their full history. You need one detail concrete enough that nobody could have written it about a competitor.
Start with the careers page and the job posting
The posting itself is research most people skip. Read it twice. The responsibilities tell you what the team is struggling to get done, and the "about us" blurb often states priorities in the company's own words. The careers page usually adds context on team structure and how they describe their culture.
If the posting mentions a specific initiative or product, that is a gift. Naming it in your letter shows you read past the requirements list.
Check recent news and the company's own channels
A quick search for the company name plus "news" surfaces funding rounds, product launches, expansions, or leadership changes from the last few months. Any of these gives you a current, specific hook. Their LinkedIn page and blog show what they are proud enough to publish, which tells you what they value.
Be careful with timing. "Congratulations on your recent funding round" lands well if it was last month and awkward if it was three years ago. Check the date before you reference anything.
Look at the people, lightly
Glancing at the profiles of the hiring manager or a few team members can tell you the team's background and the kind of language they use about their work. You are not building a dossier. You are getting a feel for whether they are formal or casual, technical or commercial, so your tone matches theirs.
Turn research into one or two sentences
The goal is not to prove you did homework. It is to connect something specific about them to something specific about you. One good sentence does this: reference the thing you found, then tie it to why it makes you want this role and what you would bring to it.
Keep it to a sentence or two. A letter that spends three paragraphs flattering the company and one on the candidate has the ratio backwards. Once your draft is ready, the same tailored angle should echo in the CV you send alongside it, and if you are building that CV from your LinkedIn profile, Postulit keeps the two documents consistent. Fifteen minutes of research is what separates a letter that gets read from one that gets skimmed.