Crop thumbnail to exact dimensions on WordPress for medium size

3 comments

1. If you want medium images to be cropped instead of scaled, like you can choose for the thumbnail size in the options page (but not for medium or large sizes), you can set the medium_crop option to true in your functions.php:

   if(false === get_option("medium_crop")) {
       add_option("medium_crop", "1");
   } else {
       update_option("medium_crop", "1");
   }
   

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2. As of now, there’s a better way to do it. You can overwrite the default image sizes—namely thumbnail, medium and large—using the add_image_size function.

   Examples:

   // Set "Thumbnail" image size
   if( function_exists( 'add_theme_support' ) ) {
   
       add_theme_support( 'post-thumbnails' );
       set_post_thumbnail_size( 150, 150, false );
   
   }
   
   // Set "Medium" and "Large" image sizes
   if( function_exists( 'add_image_size' ) ) {
   
       add_image_size( 'medium', 300, 9999, false );
       add_image_size( 'large', 1024, 9999, false );
   
   }
   

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3. Add this to your functions.php:

   add_action( 'init', create_function( '', 'add_image_size( "cropped_medium", 300, 150, true );' ) );
   

   The arguments are size name, width, height, and whether to force a crop.

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