-Many adobe products have the function you have mentioned above, but most of them are massively overpriced. I have to working with all different kinds of PDF files every day, too.
So, I have tested many free SDKs to deal with them in my working hours. But the only thing I found is that the free versions do not contain many professional functions.
What's more, the over-professional softwares are a little complicated for the common use.
However, some free trials offer many professional but simple services instead.
So that's a good choice for common use, such as
converting PDF files .
I hope it will help.