A second pass over Image Converter.
The crop toolbar is now above the picture rather than below it. Rotating a tall or wide image changes how much room the picture takes, which used to shove the rotate buttons away from the pointer between one click and the next. Its controls are also grouped so the toolbar wraps between groups and never inside one — the two rotate buttons can no longer end up on separate lines.
Size now offers Original size as well as Custom size and the presets. It is where the page starts, and choosing it again clears Width and Height, so getting back to the original after trying a few sizes is one choice instead of clearing two fields. With Lock ratio on, reshaping the crop now moves Height with it, so the size fields cannot go on describing a shape that is no longer being cut.
The choice about what happens when the size and the crop are different shapes now appears only when they actually are. The format description is on the usual "i" button instead of a paragraph under the field. The checkbox for enlarging a smaller image has gone: asking for dimensions larger than the source now simply gives you them.
The button for producing more than one file is now "Add another size or format", with a line saying what it does, and its list is called "Files to produce".