You don't need to buy an expensive program to add comments or notes to a PDF. Here's how to use Apple's built-in application, Preview, to do it all.

Here’s how to annotate PDFs on Google Drive for Android To annotate a PDF on Google Drive app, follow the steps below.

New Zealand startup Notable PDF has created an online tool to help users collaborate and annotate PDFs online.

So, let’s take a look at how you can view and annotate PDFs in Chrome, while also covering what to do if you still want to download a PDF.

Learn how to use tools to create, annotate, and extract text from a PDF on a Chromebook.

Two weeks ago I asked ProfHacker readers, “How Do You Organize and Annotate PDFs?”, and you rose to the challenge. I can’t recount the entire discussion here (though it’s well worth ...

Learn about a few PDF management and annotation tools for Mac OS X, and suggest your own favorites for this and other platforms.

And that’s exactly where you’ll find the button to create a PDF from a webpage How to save webpages as PDFs and annotate on iPhone & iPad ...

B. How to annotate PDF One of the needs of most PDF professional documents is annotation. However, annotating is never easy or possible with most PDF editors out there.

Starting with OS X Yosemite, a little-known feature made its way into Apple 's Mail program for Mac: The ability to sign PDFs and markup documents and images without ever leaving the email client ...