The present disclosure relates to an image processing method, a server, a client and an image processing system. The image processing method is applicable to the server and includes: receiving an image processing request from the client, wherein the image processing request includes a to-be-processed image in a first image format; acquiring the to-be-processed image according to the image processing request, and processing the to-be-processed image to obtain a target image in a second image format; and generating a feedback message according to the target image, and sending the feedback message to the client.