Smaller size = Speedy Site, This is an important formula to keep your site load fast (which is obviously considered by Search Engines while ranking your site in Search results), therefore keeping your site size as small it can be is important, and in most of the sites about 40% of website size is covered by images and by compressing the images will have huge impact on website size.
Compressing each and every image with a tool can be hectic, therefore the best way can be using a WordPress Plugin which will automatically compress images without having any impact on the look of images in background and you can do this with the help of WP Smush.
You can download the plugin or directly install plugin from WordPress repository, to Install search for “WP Smush.it”.
Smush.it automatically compresses images in background without any interference in your work,the images are compressed when you upload them,You can also compress all the previously uploaded images with the help of bulk smush.it option.
To Use the Bulk Smush option,First Install the plugin and once you have installed the plugin:
1.Navigate to Media and click on WP Smush
2.Now you will see an option “Run all my images through WP smush.it right now”,click on it and you are done.
3.Remember if the data is gzip compressed you will not be able to see the progress and there are also some other limitations of the plugin which are clearly stated on the page.
WP Smush only operates and compress images whose sizes aren’t exceeding 1MB.