So what I was looking for was a single app capable of pulling documents from Google, MobileMe and Dropbox, rendering them (even the large ones) with a crazy-fast engine and letting me annotate them.

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But, it’s not as hard to complete forms or annotate documents in this format, and you don’t even need expensive software to do it. Here we look at a collection of PDF apps that are either ...

You can also sign a fillable form in Preview. 1. Open the PDF in Preview. 2. Click Tools > Annotate > Signature. 3. If you've already added a signature to Preview, it will appear in a pop-up box.