How to rotate images
Extreme Thumbnail Generator can automatically rotate your images using the EXIF information (the Orientation tag). This option is turned on by default and if you want to turn it off, you can do it in the General settings.
To rotate the image manually, select it in the image list and click the 
button to rotate clockwise or 
button to rotate couterclockwise. The preview of the selected image is updated immediately.
If there are several selected images in the list, then all of them are rotated. All rotated images are saved in JPEG format, using the modified image format settings.
See also
How to set the image quality for resized or modified images, How to resize images, How to add text to images