The Image Converter web server will convert PS and EPS files to commonly used bitmap formats (png, gif, jpeg).
The image converter can only be used with sane values. Meaning width or height values lower than 10 pixel and higher than 2000 pixel will not be accepted even tough you can enter them. The same applies to the resolution which should be between 50 and 1200 dpi.
Simply left click on the desired image format. You can immediatley save the image to disk by right clicking and selecting "Save target as ...".