Definitely Useful As I mentioned, it makes the mailing process much more efficient. PDFiller allows you to create and mail PDFs easily, saving you the hassle of getting an envelope, purchasing a stamp, maybe having to go to the post office, etc. For me that has been its greatest strength. The PDF customization interface isn't bad, but it's not immediately usable. It takes a little bit of time to learn how to use it effectively. Right off the bat: I would not recommend this software to someone who isn't tech savvy or doesn't want a bit of a learning curve, for example, employers I've had in their 50s, 60s, and 70s who don't really "get" technology. The interface is fine if you just want to sign a document, but is not particularly intuitive when it comes to doing simple things like outright deleting portions of text. Too many steps.

Filling PDF files for formal use The product is very easy to use and intuitive, I didn't feel something was missing from my work with the application, in addition, it's global availability is a great advantage. The product offer mainly online editing, which makes it hard in case you wish to work on the flight or just go offline, in addition, the free use is not exactly free as it asks for a payment prior the file conversion.