An online tool to resize image to 640x480 pixels resolution online. 640 x 480 refers to a Standard Definition SD in the aspect ratio 4:3 of 640 pixels in width and 480 pixels in height.
640x480 is called SD resolution.
SD or Standard Definition is the predecessor of HD or High Definition video and is characterized by the smaller 640 x 480 interlaced screen size 4:3 ratio and 480 lines of vertical resolution.