No one can deny the importance of digital documents, and in particular, the PDF format.  It has effectively replaced paper in the most dramatic way possible and is still gaining mainstream popularity among web surfers, office workers and students alike.  

So it comes as no surprise to see a growing trend of PDF plug-ins, tools and services popping up on the Internet. PDF tools are now letting users interact with the format more freely and cheaply without tying them down to a specific software application. It’s just as easy to find a hassle-free PDF solution online as it is to find an MP3 file or a YouTube video.

If you’re looking for one, here are 12 cool PDF plug-ins, tools and services that are setting the latest PDF trends online.