Choose Insert, and then More Gadgets.
In the Google Sites Editor, open the Insert menu. You will see a list of components you can embed on your site, like Tables, Images, and Links. Find the More Gadgets option, and click it. This allows you to install customizable tools such as the POWr Image Resizer to your site.
Paste in URL
You will see the Gadget manager. Select Add Gadget by URL. Then copy and paste this exact URL into the box. Choose Add to complete.
Change Height and Width
Now that you have embedded your new, fully customizable Image Resizer Widget onto your website, you'll probably want to change the shape and size of the Widget. Using the options in the pop-up, pick a height and width for your plugin. You can also choose to add a border, scrollbar, or title around your Image Resizer Widget, but we don’t recommend it. You will have more editing options through the plugin.
Set up POWr Image Resizer
Go to the live Google Sites web page and select the settings gear in the top right corner of the Image Resizer Widget.
In the POWr Editor, click Import Existing Image Resizer, find Image Resizer- and click Copy.