Image Resizing for Ecommerce Site

We require someone to resize a large number of product images into a 540x540px size and resaved as a web optimized 72dpi image with the same file name which we can then upload.

You will be given access to the dropbox hosting of the images which can then be uploaded to a dropbox or smilar file host on completion. Should you wish to assess the number of images then they can be viewed at

https://www.dropbox.com/sh/sdd9z8s5yfqb17b/AADg9CV1LRxF-BGZqyhVcc2ea?dl=0