There are several web sites that you can use for free to instantly translate to and from Korean. The top 3 are currently Google Translate, Bing Translate, and Naver Translate (also known as Papago Translate).
I've had a lot of people ask me which is the best to use, and I've always responded with "none of them." But if I'm going to give a proper reason, I figured I should make a video to explain why.
If you need to translate something that's important, avoid machine translation wherever possible. Find out in this video why it might be a bad idea to use any of them, and learn about the problems with current machine translation.