How to create a website that changes the size of any image uploaded by the user. For eg if you want to change an image size from 10mb to 1mb

I want to create a website which can take an image from user and can change the size of image ( by size I doesn't mean width and height I mean its actual size/resolution) for example if you want to change an image size from 10 mb to 100kb you can use this website for changing