"come across" is correct and usable in written English. You can use it when you want to express that someone or something encountered something or someone in an unexpected way, or when you want to express that something exists or is encountered in a certain way. Example: As I walked down the street, I came across an old friend from school.
Do you come across as a professional?
Here they come across intact.
I've come across it.
Does that come across?" she asked.
How did you come across this story?
They have come across a constitutional charm.
Had he come across any suspected spies?
Thanks to Ludwig my first paper got accepted! The editor wrote me that my manuscript was well-written
Listya Utami K.
PhD Student in Biology, Bandung Institute of Technology, Indonesia