PDF (adobe.com)

Distribute layers and groups evenly

  1. Select three or more layers.
  2. Choose Layer > Distribute and choose a command. Alternatively, select the Move tool  and click a distribution button in the options bar.
    Top Edges 
    Spaces the layers evenly, starting from the top pixel of each layer.

    Vertical Centers 
    Spaces the layers evenly, starting from the vertical center pixel of each layer.

    Bottom Edges 
    Spaces the layers evenly, starting from the bottom pixel of each layer.

    Left Edges 
    Spaces the layers evenly, starting from the left pixel of each layer.

    Horizontal Centers 
    Spaces the layers evenly, starting from the horizontal center of each layer.

    Right Edges 
    Spaces the layers evenly, starting from the right pixel on each layer.