irfanview has been updatedirfanview Has been my suggestion for a quick, free, and easy image size and format converter for a long time with the now near death of VuePrint.
It’s no GIMP or PhotoShop but for cropping, file size reduction, or turning a good file with a bad extension into something useful; it doesn’t get better than this.
That and with the combination of official and user plugins; this is the image file version of Calibre. I’ve yet to find an image or animation file it couldn’t open. Including SVG and XML