Favicons on Rails
Such a little detail that it can be easy to miss! Chances are that this is one of that last things on your list and that you are looking forward to it ‘just being done’, so lets make this easy.
Get the images
Make an image at least 260x260px (that doesn’t have a lot of detail of course) and convert it at this website.
You will receive an archive, put that archive’s contents into your
app/assets/images/favicon folder (you will need to create the favicon folder).
Add the code
Put this in the head section of your application.html.erb file
<%= favicon_link_tag asset_path('favicon/favicon.ico') %>
Or do it the hard way
Check this out if you want to go further down the rabbit hole.