The Perfect Fit option in the configurator prevents photo cropping for suggested formats, but cropping may be needed for unsupported formats or limited sizing products. More info is in the linked article.
No, through the Perfect Fit option, which can be found in the configurator, the automatically suggested formats will not require your photo to be cropped. If a different format, not supported by the Perfect Fit, is selected, then your photo may need to be cropped through the WhiteWall website. This may also happen for products that have a limited number of sizing options.
More information about the Perfect Fit is available in this article.