7. The Menus / 7.4 The Layout Menu
The command Align To Pixels aligns the content of the selected layers to the pixel grid of the current document.
With groups the layers within the group will be aligned, too. With vectors the single points of the vector layer might be modified.
This command is similar to the layer attribute Alignment (see chapter 4.11) with the one difference, that this command modifies the layers permanently.