Embodiments of the present disclosure provide methods and systems for previewing a web page. The methods include: sending a web page previewing request to a middleware server in accordance with a web page previewing triggering instruction; loading, by the middleware server, a main document of a web page link requested to be previewed in accordance with the web page previewing request, and typesetting the main document; and partially capturing the typeset main document and uniformly scaling the captured typeset main document in accordance with a screen size of a mobile terminal to generate a preview image for the mobile terminal to display. With the present disclosure, a web page can be rapidly previewed, thereby reducing the waiting time of a user.