Contractions are perfectly acceptable, encouraged even, in certain situations. They can make things easier to read and make our content more human and conversational. Their use depends on two things:
1. Which ones you're using
These are fine: I'm, you're, we're, it's, that's, there's, can't, couldn't, wouldn't:
Ones to definitely never use, please, include: it'll, it'd, they'd, I'd, must've, would've, there've. These contractions make content less readable and can cause momentary confusion.
2. What you're writing
In a news story on some new research findings or a write-up of an event, contractions are fine; in a report for a formal committee meeting or an official letter sent on behalf of the university, they are less appropriate.
While we like to be conversational, contractions can make something that needs to be serious sound just the opposite:
This relates to what tone is most appropriate for what you're writing.
Read more about how to get the tone of your writing just right in our guide to voice and tone.