Photo Stitcher could help you to merge multiple photos automatically and make a single long one. The whole process could be done in a few seconds. You can use Photo Stitcher to merge Conversion screenshot / To-Do List / Tweet List / Comment List / Long Article / Long Web Page or anything you want.
Updated on Apr 02 2020
Note: Although Finder reports no version, the developer states that this is version 1.3.0