Picapiu is an AI tool designed to generate portraits based on user-selected images. It offers a Chrome extension that allows users to transform images found online into personalized portraits. By clicking the “Piu!” button on any large image or selecting an image from the context menu, users can describe the desired modifications and generate a new portrait within seconds. The tool is user-friendly and does not require a credit card to try, making it accessible for anyone interested in creating custom portraits.