It's 100% privacy-friendly, meaning your images don't go to any server to convert images to PNG/JPG/WEBP. Everything happens on your device.
All other tools out there keep a copy of your image on their server while processing. You can't be 100% sure that your image will be deleted afterwards.
But if you use this tool, I guarantee that your images never leave your computer. They stay on your device and are processed there. Hence, it's 100% privacy-friendly. Plus, it's free!