Many people use the scaled image for thumbnail image. Instead of that croping image the proper size and showing that is nice. Crop Uploaded image without plugin is supported by wordpress itself so do not use any third-party plugin for this.
crop uploaded image in wordpress
You can use the following code in your functions.php file:
// Standard Size Thumbnail if(false === get_option("thumbnail_crop")) { add_option("thumbnail_crop", "1"); } else { update_option("thumbnail_crop", "1"); } // Medium Size Thumbnail if(false === get_option("medium_crop")) { add_option("medium_crop", "1"); } else { update_option("medium_crop", "1"); } // Large Size Thumbnail if(false === get_option("large_crop")) { add_option("large_crop", "1"); } else { update_option("large_crop", "1"); }
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