YSSY Upload Viewer is a free Chrome add-on developed by Zhonghua Xi. It is a tool designed to enhance the image viewing experience on websites.

The main features of YSSY Upload Viewer include automatic loading of images, support for centered thumbnail display, keyboard scrolling and paging, automatic page flipping, and hiding of non-image columns.

This add-on has undergone several updates, with the latest version beingreleased on June 27, 2015. This version fixed an image src prefix issue. Other updates include the addition of keyboard shortcuts, reverse display of images, a progress bar, UI improvements, bug fixes, and options for hiding tables and setting automatic background colors.

YSSY Upload Viewer is a useful tool for users who frequently view images on websites, providing a more convenient and customizable image viewing experience.