Font Awesome not working in offline mode

You also need to download the fonts themselves as well...It is a font, like any other...So, go to fontawesome website, follow the instructions and download css + fonts :)

Could be a pathname problem Try:

<link href="./css/font-awesome.css" rel="stylesheet">

Did you embed FontAwesome font into your project? your structure must be like this:

[+]assets
    [+]css
        font-awesome.css
    [+]js
        demo-file.js
    [+]fonts
        fontawesome-webfont.eot
        fontawesome-webfont.svg
        fontawesome-webfont.ttf
        fontawesome-webfont.woff
        fontawesome-webfont.woff2
index.html
sample.html
whatever.html

after that, you can use FontAwesome locally.

I think you didn't download fonts or you used the wrong path. You can download the latest version font awesome at https://fontawesome.com/download. And don't forget check your path!

Hope this helps.