Snapping is a feature drawing aid that helps control the accuracy of the pointer when drawing geometries near a vertex or other geometry. When snapping is on and you hover near a feature, the pointer is snapped to the geometry if it is within the snapping tolerance.
Note:
If you've updated the snapping configurations for a web map in another app using the same browser, the configurations will be used by default in ArcGIS Web Editor and vice versa.
Z-values are not currently considered when snapping features.
Click Snapping options 
on the general toolbar to configure snapping for the web map. The following configurations are available:
| Configuration | Description |
|---|---|
Enable tooltips | When enabled, tooltips are visible while creating or editing features. The tooltip displays the latitude and longitude at which the point or first vertex is placed. After the first vertex is placed, the tooltip for line features displays the deflection (angle) and distance from the last vertex and the total length of the line. The tooltip for polygon features displays the deflection (angle) and distance from the last vertex and area of the polygon. Tooltips can also be turned on or off by pressing T on your keyboard. |
Enable snapping | When enabled, configurations for geometry guides, feature to feature snapping, and snapping layers are available. |
Geometry guides | When enabled, geometry guides display visual cues to help you identify when you're drawing lines that are perpendicular or parallel to other lines in the feature. These guides are used for line and polygon features. In the image below, a square appears where two lines are perpendicular to one another, and small lines appear on either side of the line that is being drawn parallel to another line in the polygon.  |
Feature to feature | When enabled, the vertices of the feature you draw will snap to the vertex, edge, or endpoint of an existing feature. To use feature to feature snapping, you must also enable Snapping layers. In the image below, the editor draws a feature with the vertex snapped to the vertex of an existing polygon feature.  |
Snapping layers | Snapping layers determine which layers will have feature to feature snapping enabled. |