oh, in that case it's enough to go in the crop section, select "pic" to keep the current "picture" aspect ratio and resize the crop box

I must admit this baffles me a little. Width and heights are measured in pixels. The number of pixels of an image is width x height (eg a raw image 256x256 means it has 256*256 = 65.536 pixels = 262.144 bytes - if RGBA8). I cannot reduce its pixels and keep the same width and height or viceversa. I can a) reduce the quality of an image with a lossy compression (in download if you select jpg you can reduce the quality which will in turn reduce the file size) b) scale an image when displayed in a browser (canvas.style.width > canvas.width) but the underlying image will still be canvas.width

Maybe I'm missing something

Ok interesting. I'll investigate thanks

done!

numbers input added