Learn how to blend two images in GIMP using layer opacity, image blend mode and gradient tool over a layer mask.

You can resize an Image in GIMP by dragging, without losing quality or stretching and keep it sharp. We show you how!

To add a picture-based watermark, from GIMP’s menu bar, select File > Open as Layers (or press Ctrl+Alt+O). Select the photo you’d like to add as a watermark to your image and choose "Open." ...

Also: How to use Layers in the GIMP image editor If you were to try and edit a complicated image without using layers, you'd very quickly realize how impossible it is.