How To Annotate PDF Online?
Upload & Edit Your PDF Document
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Easy-to-use PDF software
Is there any app or extension that can annotate PDF files directly from the Chrome browser, then saves the highlighted PDF file or that uploads it to Evernote?
This chap has the [answer](Google Groups). You simply need to disable the built in PDF viewer and *then* follow the tip below.
Annotate PDF: All You Need to Know
Wonder share for making this free.