Merge layers in Photoshop
Merge specific layers together
1. Hold the Shift-key pressed and select all the layers you want to merge together
2. Make a right-click on one of the layers and choose “Merge Layers”
Merge all layers together
1. Make a right click on any layer
2. Choose “Merge visible”
Alternatively you can also press CTRL+A in the layer window. After all the layers are selected you can also make a right-click and merge them together.