Resize images to a set width in pixels. The height follows automatically so nothing looks stretched.
PNG ignores the quality setting because it is lossless. Enhance uses smooth upscaling and sharpening, not AI, so it makes soft images crisper but can't recover detail that isn't there. If your browser can't write AVIF, that option reports an error and you can pick another format.
Resizing only makes images smaller here. To enlarge, use the Upscale option in the Enhance menu.
Yes. The height is calculated from the width.
The max width field only shrinks. Use Upscale 2x in the Enhance menu to enlarge.