Annotate on any documents online
Free online PDF annotator
Add text comment, point comment, and area comment on PDF online. Add pure text, draw simple pictures, highlight text on PDF.
Free online PDF viewer
You can use it as an online PDF viewer. No need to install Acrobat products on your on your iPhone, iPad, computer...
Share PDF online
Share PDF with others by sending a link to them via emails, Facebook, Twitter, etc. No need to download anything.
Share ideas with friends
Invite friends, tutors, or anyone to add or reply to comments. A great way to share brilliant ideas and wide knowledge with others.