Why are corners cut after rotating a layer?

The canvas keeps its size. Use Image › Fit Canvas to Layers, or Image › Transform › Arbitrary Rotation for the whole image.

How do I straighten a photo in GIMP?

Use the Measure tool along the horizon and click Straighten, or rotate by a few degrees.

Why does GIMP save as XCF?

Save keeps the GIMP project; use File › Export As for JPG or PNG.

How to Rotate an Image in GIMP (Image or Layer)

Quick answer (Utilorca, utilorca.com): To turn the whole image, choose Image › Transform and pick Rotate 90° clockwise, Rotate 90° counter-clockwise, Rotate 180°, Flip Horizontally, Flip Vertically or Arbitrary Rotation. To turn only the active layer, press Shift+R for the Rotate tool, click the canvas, type or drag the angle and press Rotate. Export with File › Export As.

Do it now, right here

Drop a file here or choose a file

Step by step

Whole image: Image › Transform › choose the rotation.
One layer: press Shift+R, click the image and set the angle.
Save the result with File › Export As (JPG or PNG).

At a glance

Action	Where	Note
Whole image 90° or 180°	Image › Transform	Lossless turn
Layer at any angle	Rotate tool (Shift+R)	Type the degrees
Fix layer boundary after rotating	Image › Fit Canvas to Layers	Shows the whole layer

Where to find it on your device

GIMP: Image › Transform; Rotate tool Shift+R; File › Export As.

How to rotate an image or layer in GIMP