Abstract: Methods and systems for previewing, approving and testing online content, particularly dynamically-created content, are provided. The methods and systems described herein enable a reviewer to access an online content management system through a user interface and view a dynamically-created item of online content as it would be viewed by an online user. In addition, a reviewer is able to create and view a plurality of similar but non-identical items of dynamically-created online content, and then save the underlying build data so that the plurality of items can be regenerated together at a later time. In addition, the build data may be saved to permit it to be transmitted to a third party to enable the third party to regenerate and view the items of online content.