A site similar to 12ft.io but is self hosted and works with websites that 12ft.io doesn’t work with.
How does it work?
It pretends to be GoogleBot (Google’s web crawler) and gets the same content that google will get. Google gets the whole page so that the content of the article can be indexed properly and this takes advantage of that.
Seems like this can be done in the browser using a user agent switcher.