When you upload a picture on your advert the system will automatically resize the picture and display it in the preview. This works best with landscape images and 99% of the time your picture will display correctly.
There are times when your picture may get cropped during the resize process and not display correctly.
If you have basic Photoshop skills you can manually resize your picture to Width: 218px Height: 98px before uploading for a perfect fit.
If you need assistance please click on the Help link in the top menu.