By default, the gallery shortcode does not allow to limit the number of images displayed. This makes sense when you for example include all images attached to a post like this: [gallery id="4"] When this plugin is activated, you may use: [gallery id="4" limit="3"] and it will only display three images. You can also use an offset parameter: [gallery id="4" limit="3" offset="1"] Will display at most three images, starting at the second. Note that this plugin is a little bit of a hack.