The Zoom functions allow you to modify the magnification on an image. It enables you to zoom out on large images so the entire image is visible, or to zoom in on an image to do pixel-level editting.
Zoom in zooms 100% in each time it is clicked up to a maximum of 1600%. Zoom out zooms out at progressively smaller intervals to a maximum of 6%. Note that for large images, zooming out may take a short while because GIMP has to load extra parts of the image from memory.
Default Keyboard Shortcuts: = for "Zoom In", - for "Zoom Out" and 1 for "1:1".