If you are looking to reduce the size using coding itself, you can follow this code in php.
$d = compress($source_img, $destination_img, 90);
This is just a php function that passes the source image ( i.e., $source_img ), destination image ( $destination_img ) and quality for the image that will take to compress ( i.e., 90 ).
$info = getimagesize($source);
The getimagesize() function is used to find the size of any given image file and return the dimensions along with the file type.
