Smush.it resize images?

Hi WP rookie,

Thank you for your question.

The WP Smush.it doesn’t resize images but optimizes it by removing unnecessary bytes from image files. Also it can only process JPG, GIF, and PNG images that are up to one megabyte in size.

You will find more information about it on the following page.

https://developer.yahoo.com/yslow/smushit/faq.html

To resize images you can try using any of the following plugins.

https://wordpress.org/plugins/regenerate-thumbnails/
https://wordpress.org/plugins/ajax-thumbnail-rebuild/

Best Regards,
Vinod Dalvi