PDFfiller's simple yet powerful editor allows you to add comments anywhere in your document. To add a comment, select the Comment button in the main toolbar.
Press the blue Add comment button and click on the text or image you want to comment on.
Type your comment in the text field and click Comment.
To edit, delete or reply to a comment you’ve added, click More and select Edit, Delete or Reply.
Click Save when you've finished editing a comment.
Click Reply when you've finished adding your response to a comment.
To delete a comment, click Delete and then OK to confirm your action.
To resolve a comment, click Resolve. This will remove the comment.