The present application provides an online document commenting method and apparatus. In an embodiment of the method, an operation of a user on a display interface is monitored, and a commenting behavior of commenting on a first document is recognized. The format of the first document is acquired when the commenting behavior is recognized, and the format of the first document is determined whether a pre-set format. The format of the first document is converted in order to generate a second document when the format of the first document is not the pre-set format, wherein the format of the second document is the pre-set format. The comment information regarding the second document is received and displayed. By means of the method, it is possible to present comment content to a user having a comment requirement, and not present the comment content to a user having no comment requirement.