What is the recommended image size/pixel size/resolution for images added to my Wix site?
When an image is uploaded to a Wix site, Wix automatically optimizes it, taking both image quality and site loading time into consideration. Provided that your image file is under 15MB, there is no need to change the size or resolution before uploading it.
You can resize an image on your Wix site by dragging the resize circles around the edges of the image.
For information on optimizing your images, please check out these guidelines.