I want to be able to use web apps (like http://www.epochconverter.com/, or any other, really) offline. How do I save them? ("Save as…" doesn't work).
closed as too broad by Rubén, Mehper C. Palavuzlar, ale, Vidar S. Ramdal, user79865 Oct 31 '15 at 5:30
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The browser "Save File" feature will download a very basic version of a site. Much of the site will use references to things that are on the internet. This will only work if it's a very simple site with most of the scripting built into the HTML.
This will not work for all web apps. Some apps communicate with the server to perform calculations or load new content. For example, you will never be able to save Pandora to your hard drive, because it needs its server connection to load new songs.