Kogashitsuka AI is an online image enhancement tool that uses AI to sharpen and improve low-resolution photos and illustrations. It can enhance images at their original dimensions or upscale them by 2x or 4x. The tool is suitable for portraits, illustrations, product images, social media content, and more. No professional software or installation is required. Simply upload an image in your browser to get started. Free credits are available for testing, with additional credits available for purchase when needed.