To avoid unacceptable image distortion, I'd suggest either beginning with an image that's close to a multiple of 40x50, or else cropping it to approximately those relative dimensions, before you use that online tool to create a 40x50 image.
(sakla) Keep your Inbox clean by Archiving important messages and regularly using the Delete All Messages in your Inbox option. (pauloaguia) (Bütün ipuçlarını göster)