gridsnapping

Grid snapping, or snap to grid, is a feature in digital design and modeling that constrains the movement or placement of objects, points, vertices, or handles to discrete coordinates defined by a grid. This helps align elements consistently and quickly.

The grid is defined by a grid size or spacing. When snapping is enabled, objects align to the nearest grid line or grid intersection, depending on the settings. Many programs offer options to snap to grid lines only, to grid intersections, or to a combination of guides and other objects. A snapping tolerance or threshold controls how far an item must be moved before the snap occurs. Grids can be rectangular, isometric, or polar, and in 3D environments grids may extend in multiple dimensions.

Applications and usage vary by domain. In computer-aided design (CAD), vector graphics, and desktop publishing, grid snapping promotes precise layout and repeatable measurements. In user interface and web design tools, it helps achieve consistent spacing and alignment across components. Game editors and level designers also use grid snapping to place tiles, objects, and actors predictably. Some software supports temporary snapping (hold a modifier key to disable snapping briefly) and provides visual grid displays to aid positioning.

Benefits of grid snapping include faster alignment, consistent spacing, and improved reproducibility. Drawbacks can include reduced flexibility or stiffness in layouts if overused. Users often toggle snapping on or off, adjust grid density, or combine snapping with guides and distribution tools to balance precision with creativity.