Cyberduck

Cyber Duck is a free FTP (File Transfer Protocol) program (also called an FTP client) that allows you to upload, download and change permissions of files you keep in the webspace.

It's fast to download the Cyber Duck program but you need to have arranged for space on a server that will host the files uploaded with Cyber Duck. Once server details and password are set up, it is just a matter of dragging or importing the folder containing the html and related files. It is very important to not disturb or change the file structure.

FTP and Cyber Duck is also excellent for sharing large files, like videos, which take ages to up and download with Dropbox for example. 

First basic site I uploaded via Cyber Duck

Here are some good websites explaining Cyber Duck:

Cyber Duck complete instructions

USE FTP with Cyber Duck - video