Which service gives a screenshot of the site quickly and for free?

Question

Computer networks

It is necessary for articles to search for topics screenshots of sites.
Which service makes them free and, most importantly, relatively quickly? It is possible with the ability to insert a preview, or just give a link to the original.
ZYZH is desirable to understand web fonts.

Answer 1

And what's the problem with implementing it yourself on phantomjs?
For example , here you can find a bunch of ready-made implementations in PHP (if you need to call it from the web).

Answer 2

And PrintScreen than does not suit?