If you don't have an API Key, sign up here. It's free and it only takes one minute.
Fill in the API Key in the field above and press Validate. The API Key will be saved on your site in the shortpixel-php/shortpixel.ini file.
After you input your API Key, the folder selection page will be available. Please select the folder that you want to optimize and press the Optimize Now button. Please make a backup of your images folder and make sure that the folder you optimize is writable.