Sending SVG images by SMS and WhatsApp requires converting them to PNG format, which can be done using the CairoSVG package for Python. The package renders SVG files without quality degradation at any resolution, making it suitable for generating diagrams and charts. To use CairoSVG, install the required packages, including Cairo, and create a Flask application that converts the SVG image to PNG on the fly. The application takes optional width and height arguments from the query string of the request URL, allowing users to resize the converted image as needed. Once implemented, this endpoint can be used in Twilio-based applications to send SVG images via SMS and WhatsApp.