LibreOffice version 5 and later already has image crop feature in Writer, Calc, Draw, and Impress components. This is a long awaited feature for them. This article shows how to do it.
Forfatter, Impress, & Draw
Insert an image into the document. You may do Ctrl+C & Ctrl+V a file from file manager or by menu Insert > Bilde.
Select the image > Trykk Crop Image button in the Image Toolbar. Du vil se 6 blue handles in the edges of image. Now drag one of them and release to crop it.
To revert the image back, just press Ctrl+Z.
Insert an image by menu Insert > Bilde. Select the image > Trykk Crop Image knappen.
Viktig: actually, cropping doesn’t change the original image inside the document. The original image is still inside the document, but only the modified one is showed. If you do right-click > Save Image to the cropped image, you will save the original image. This behavior is similar with what we see in Microsoft Word 2007 eller senere.