Guides and the grid help you position images or elements precisely. Guides appear as nonprinting lines that float over the image. You can move and remove guides. You can also lock them so that you don’t move them by accident.
Smart Guides help you align shapes, slices, and selections. They appear automatically when you draw a shape or create a selection or slide. You can hide Smart Guides if you need to.
The grid is useful for laying out elements symmetrically. The grid appears by default as nonprinting lines but can also be displayed as dots.
Guides and grids behave in similar ways:
Selections, selection borders, and tools snap to a guide or the grid when dragged within 8 screen (not image) pixels. Guides also snap to the grid when moved. You can turn this feature on and off.
Guide spacing, along with guide and grid visibility and snapping, is specific to an image.
Grid spacing, along with guide and grid color and style, is the same for all images.
Choose View > Show > Grid.
Choose View > Show > Guides.
Choose View > Show > Smart Guides.
Choose View > Extras. This command also shows or hides layer edges, selection edges, target paths, and slices.
If the rulers are not visible, choose View > Rulers.
For the most accurate readings, view the image at 100% magnification or use the Info panel.
Choose View > New Guide. In the dialog box, select Horizontal or Vertical orientation, enter a position, and click OK.
Drag from the horizontal ruler to create a horizontal guide.
Hold down Alt (Windows) or Option (Mac OS), and drag from the vertical ruler to create a horizontal guide.
Drag from the vertical ruler to create a vertical guide.
Hold down Alt (Windows) or Option (Mac OS), and drag from the horizontal ruler to create a vertical guide.
Hold down Shift and drag from the horizontal or vertical ruler to create a guide that snaps to the ruler ticks. The pointer changes to a double-headed arrow when you drag a guide.
(Optional) If you want to lock all guides, choose View > Lock Guides.
Select the Move tool , or hold down Ctrl (Windows) or Command (Mac OS) to activate the Move tool.
Drag the guide to move it.
Change the guide from horizontal to vertical, or vice versa, by holding down Alt (Windows) or Option (Mac OS) as you click or drag the guide.
Align the guide with the ruler ticks by holding down Shift as you drag the guide. The guide snaps to the grid if the grid is visible and View > Snap To > Grid is selected.
To remove a single guide, drag the guide outside the image window.
To remove all guides, choose View > Clear Guides.
(Windows) Choose Edit > Preferences > Guides, Grid, & Slices.
(Mac OS) Choose Photoshop > Preferences > Guides, Grid, & Slices.
For Color, choose a color for the guides, the grid, or both. If you choose Custom, click the color box, choose a color, and click OK.
For Style, choose a display option for guides or the grid, or both.
For Gridline Every, enter a value for the grid spacing. For Subdivisions, enter a value by which to subdivide the grid.
If desired, change the units for this option. The Percent option creates a grid that divides the image into even sections. For example, choosing 25 for the Percent option creates an evenly divided 4‑by‑4 grid.
Smart Guides come in handy in several scenarios, such as the following: