Photoshop

Use snapping

Snapping helps with precise placement of selection edges, cropping marquees, slices, shapes, and paths. However, sometimes snapping prevents you from correctly placing elements. You can enable or disable snapping using the Snap command. You can also specify different elements to which you want to snap when snapping is enabled.

Enable snapping

 Choose View > Snap. A check mark indicates that snapping is enabled.

Specify what to snap to

 Choose View > Snap To, and choose one or more options from the submenu:
Guides
Snaps to guides.

Grid
Snaps to the grid. You cannot select this option when the grid is hidden.

Layer
Snaps to the content in the layer.

Slices
Snaps to slice boundaries. You cannot select this option when slices are hidden.

Document Bounds
Snaps to the edges of the document.

All
Selects all Snap To options.

None
Deselects all Snap To options.

A check mark indicates that the option is selected and snapping is enabled.

If you want to enable snapping for only one option, make sure the Snap command is disabled, and then choose View > Snap To and choose an option. This automatically enables snapping for the selected option, and deselects all other Snap To options.