The application works very simple, you only have to drag the file or files you want to send to the corresponding box, enter the email address of the addressee, your own email address to receive a confirmation, and an optional text message that can accompany the file.
Once you've filled in all those fields, the program will start to work and in a matter of seconds, minutes or even hours (if you reach the 2 GB maximum that WeTransfer allows to upload) you will have you download ready.
WeTransfer is a very useful tool that allows you to send very big files by mail very easily. For example, you can send all the pictures of a vacation to the email of a friend all in one go. As simple as that.