The target size for a listing's thumbnail image, or the square listing image preview shown in the listing feed and on member corners, is 190 x 190 pixels. Thumbnails require automated cropping, unless your listing image is a square then no cropping is required.
Our system determines where to crop based on image cues. This means that the cropping can sometimes be off if the photo was taken in low light or has multiple points of focus. If your listing thumbnail image is off-centered, we recommend re-sizing the original image to a square. If you need assistance editing or re-sizing your image, contact customer support.