Upscayl is a free, open-source AI image upscaler designed to fix blurry and SD images. With a Linux-First approach, Upscayl ensures optimal performance on Linux, while also catering to MacOS and Windows users. This desktop application utilizes advanced AI models to upscale low-resolution images with just a single click. The tool also supports batch image upscaling for enhanced efficiency and provides a sharpening feature to add that extra touch of refinement. You can also check out Upscayl on the official GitHub page.