What is the best image optimizer? What is image optimization techniques? Optimize e-commerce images for your WordPress shop with How to Resize Images on WordPress (without losing quality) If you want to improve the quality of your website's images you can do several things to help your images, such as resizing them. Resizing your images makes them smaller but saves time and improves the overall quality of your site. A Word About Image Types All photos are composed based on an image type. A wide variety of image types are used throughout the Internet and can be used for practically any Web project. Image compression has been one such way of transforming an image, so you have to pay attention to the most common types. Some common types used are: WebP, JPEG, GIF, TIFF and PNG. WebP and JPEG can be useful on mobile operating systems, as well as Web-based sites. How to Resize Images on WordPress The first step to resizing your images is to figure out whether you have the option to resize an image. If your site features one or more galleries, this may be the case. The next thing to consider is whether you resize the images for the sake of reducing download size or performance. In both cases resizing your site's images is generally a good idea. (We will discuss image optimization in more detail in the next section.) Here is a simple example of a gallery where you may not be able to resize an image and, because of that size limitation, need to do so anyway. The image we are working from here is a large image used to create an image slider that you may have seen on a theme's footer. As you can see in the image above, the slider is sized to an 8 × 10 pixel square. If you scroll all the way to the bottom of the image gallery you can see the image slider is sized at only a 20 × 30 pixel square; I don't like this setup because you are not seeing the image at the smallest size possible. So a resolution of only 20 × 30 will be used. In fact, this is the default image width and height used by WordPress for the image slider in the admin panel. Therefore, it will have to be resized to be smaller than this value, and we can do that with the following methods: In order to achieve this size you must also resize your gallery's thumbnail images which will also have to be resized.