Assume I loaded a *.jpg file into Krita.

Then I selected a rectangle part of the picture.

1.) How can crop everything outside the selection rectangle?
2.) How can I move the selection content to another position in the image?

Peter

1) With the crop tool
2) With the move or transform tool

boudewijn wrote:1) With the crop tool
2) With the move or transform tool

Ok, assume I selected a rectangle area with the Rectangle selection tool.
Then I click on the "Crop tool" on the left.
This causes the area outside the rectangle to turn dark.

But how do I really crop (=delete) the now dark area?

psteiner wrote:But how do I really crop (=delete) the now dark area?

1. CTRL+R (switch to the "Rectangular Selection Tool")
2. select an area
3. C (switch to the "Crop Tool")
4. "Tool Options" docker > press the "Crop" button to apply

If you just want to delete everything outside of a selected rectangular area (or any kind of selected region), you can invert the selection (Cntrl+Shift+I) then press the Delete key. Then you can invert the selection again (to select the inside of the region) and then use the Move tool to move the contents of the selected region.

The selection tools have their own internal options which let you do all sorts of things with Replace, Add, Intersect, Subtract of selection shapes to define the final selected region(s).

The crop tool is limited to a rectangular region defined by it's own internal options values. The rectangular selection values are passed over to the Crop tool as a convenience measure. After that, you can change them within the crop tool. Depending on the options you select, you can delete layer contents or actually crop (reduce in size) the canvas and you can even grow the canvas which is a sort of anti-crop effect.