So ...
Before anything else, please keep in mind that you should create a full website backup before bulk resizing your images. It's an action that cannot be undone!
With that having said, let's see the tool ...
It's a handy plugin called Imsanity.
Here it is:
https://wordpress.org/plugins/imsanity/
It's a quite small plugin (150 KB), but let's see the usual speed tests ...
Here are my results before installing the plugin ...
... and the result after installing and activating the plugin:
No more comments needed ...
With that having said, let's see how it works ...
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smartketeer
Premium
Your post or page content will displayed using a given width defined by your theme. That should be the exact width for the images used in your posts and pages. The height doesn't really matter, but a 4:3 aspect ratio usually looks better.
Similarly, any other image size (backgrounds, related post preview images, logos, etc) are defined by your theme template files. If you can't find any related information in the Theme Customizer, then you can use a tool called Pixel Ruler to measure each default image size. You can download it here
https://pixel-ruler.en.softonic.com/download
Similarly, any other image size (backgrounds, related post preview images, logos, etc) are defined by your theme template files. If you can't find any related information in the Theme Customizer, then you can use a tool called Pixel Ruler to measure each default image size. You can download it here
https://pixel-ruler.en.softonic.com/download
PoppaJoe
Premium
In addition to what smartketeer mentioned to you, there is also this training from Jay Neill. Beautifying Your Website With Image & Graphics
