How to test a site for mobile friendliness?

I am working on writing my first serious website as a personal project and would like to test it for mobile friendliness and compatibility before I go through the process of actually configuring the FTP, etc. Is there a way to do this using just the files locally on my computer? I've tried to research a way to just upload all the site files and view how everything would look on a mobile browser, but I have not been able to find anything. Or, is there a way to open the HTML files on my phone in a browser, i.e. Chrome?