Resizing your larger bulkier images can reduce your page loading time significantly, especially if you are a blogger that like to be visual and use a lot of images.
The benefit of this is user experience, due to faster page loading times and of course, google considers your site speed as a factor in rankings.
To do this automatically, we are going top use a free plugin called IMsanity, an abbreviation of Image sanity.
Image sanity can both bulk resize images for you for previously uploaded images, automatically resize images for future images that you upload and convert BMP and PNG to Jpeg.
It is set and forget plugin. Once uploaded it requires no action on your part, other than possible initial bulk resizing of images
The link below will take you to the plugin page
https://wordpress.org/plugins/imsanity/
Simply just upload and activate.
Ray