Is there a WordPress Plugin like Imsanity that keeps high resolution originals? [closed]

Why do you need a plugin for that? Set image quality to 100% in WordPress with following code.

function my_new_image_quality( $quality ) {
    return 100;
}
add_filter( 'jpeg_quality', 'my_new_image_quality' );
add_filter( 'wp_editor_set_quality', 'my_new_image_quality' );

Now when you upload a image, WordPress always crop your image for different thumbnail sizes but it also keeps orignal image.

To get orignal image you can call

<?php the_post_thumbnail( 'full' ); ?>

This will display full resolution original image.