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Edit text content* in PDFs like what you usually do in Word documents. You can edit the font and size of the original text without leaving your PDFs. (* Text editing is still in beta stage and available for Mac version)
You can annotate and view comments on any PDF file stored in Dropbox from your desktop or mobile app. You can also annotate a stored PDF file by adding your notes in Dropbox comments. Simply open the PDF in Dropbox that you want to annotate, click on the location on the PDF you’re talking about, and then add your comment
In PhantomPDF, you can manipulate documents, even add multimedia, that’s a rare feature. A decent spellchecker is also not that common for free PDF editor apps. It is one of the few PDF editing apps that allow users to monitor document use and obtain business intelligence data