make urls active across hundreds of posts

Hello,
I’ve imported a .csv file that includes full url’s – one per post – and they are not
“clickable” – they show up just as plain text.

Is there a way to change these to become active hyperlinks?

There are over 1,200 posts that include different urls to articles within each
post and they need to be live.

Is there a tool/plugin that can do this so I do not have to do it manually?

Thanks!
Rob