This provides a method, device, and system for sharing image data. When detecting an image being rendered on an image-rendering interface of its rendering application, a first terminal can obtain image information of the image being rendered and location information associated with the image information. The first terminal can transmit a first image data to a server, the first image data including the image information and location information. The server can transmit the first image data to a second terminal which shares images with the first terminal, the second terminal also equipped with an image rendering application. The second terminal can receive the first image data and render an image based on the image information at a location corresponding to the location data on an interface of its image-rendering application. This can facilitate image data sharing among multiple terminals.