Sign in to Acrobat Web at https://documentcloud.adobe.com with your Adobe ID and password, or with your social (Facebook or Google) account.
While reading your PDF file online, you can add notes to yourself using the add comments tool. You can add text, sticky notes, underline text, strikethrough text, highlight text, and add markups using the drawing tool.
You can use quick actions in a floating toolbar to add comments in the document.
Click any PDF file to open and view. The following quick actions are available for commenting based on your selection in a PDF:
Select a file you want to comment by doing one of the following:
The selected PDF file is displayed in the browser window with the Add Comment toolbar. Select the desired annotation tool, and click where you want to place in the PDF. The following comment types are available for use:
All the comments that you add to the PDF are displayed in the right pane.
A. Add Sticky Note B. Highlight Text C. Underline Text D. Strikethrough Text E. Add Text Comment F. Use Drawing Tool G. Change Color H. Undo comment I. Redo comment
For annotations like Text Comment, Highlight Text, Drawing Tool, Strikethrough Text, and Underline Text, the comments are added instantly to the document. For a Sticky Note annotation, the comment pane is displayed in the right. Type your comment, and click Post.
Adobe Document Cloud autosaves the PDF in 10 seconds. To save the PDF immediately, click Close in the toolbar.
To edit a comment, do the following:
To undo or redo any action, do the following:
To delete comments, select the comment and do one of the following:
To change the color of your comments, do the following:
Select the comment. A floating toolbar appears.
Similarly, you can choose and change the line thickness of the Drawing Tool annotation, and adjust the font size of the Add Text annotation.
Click the color to open the color panel.
Select the desired color.
After adding comments, you can download or share the PDF to get comments from others. Click Share button in the toolbar, and then share the file using any one of the following methods:
If you are a free user, a Download button is visible instead of the Share button.
For more information, see Sharing PDFs.
To download a copy of the file, click Share > Download a copy. A copy of the PDF file is saved to your computer.
To track the shared files, in the top-menu bar of Adobe Acrobat home, click Document > Shared By You. All the files shared by you are displayed. For more information, see Track shared files.
The recipients get an email notifying them that the file is shared with them. The email contains the Open button and a link to the shared document. Clicking the link or the button opens the document in a browser. Recipients can also download the document if necessary. For more information, see Recipients experience.
Try the online PDF tool: Edit PDFs wtih comments online