The problem with PDF documents (or Ebooks) is that they are “Read Only” and you can’t modify it, add textual content and other graphics as easily as in a word document. Yes there are both desktop tools and web based apps which allow you to edit a PDF document; but not everyone may be comfortable using them.
Then comes online office suites like Google Docs, which allows you to upload the PDF document – create a copy and then add your custom commentary, notes on the document. Then you can download the modified document on your computer or share it with anyone via email.
If you are looking for an offline PDF editor which can be used to add custom comments, notes and annotations on a PDF document without modifying the actual document, try Jarnal
Jarnal is not a standalone PDF editor and neither you can create PDF documents with the tool. Instead, it’s a simple annotating tool which can be used to add custom comments, notes over any document for collaboration.
Extract the package and double click the jarnalannotate.cmd file to start annotating a PDF document. Load the document as the background and you can highlight a section of the document or add custom comments, as seen in the following example:
Once you are done adding notes, you can save the document as PDF or a JPEG image. This is quite useful, when you do not want to use another PDF editor just for the sake of adding a few comments to it. Screen Capture tools might be another solution but not all of them support a PDF export with your annotations.
Students and people who are part of an editorial team will find this tool very useful; can be used for passing remarks, adding comments to any PDF document. Also check out Markup.io – a brilliant tool for annotating webpages with custom comments.
Jarnal is cross platform compatible and thus will work with Windows, Linux or MAC.