Selecting

Selection tools are available in the Select Menu in the header, and the shortcuts listed below.

Sync Selection

Turning on the Sync Selection button causes selection of components in the 3D Viewport to sync with their corresponding elements in the UV editor. If off only the selected faces are displayed in the UV editor. These two modes have very different results when transforming components in the UV editor.

Selection Modes

Select Modes dependent on the Sync Selection.

Sync Selection Off

Vertex: Select individual vertices.
Edge: Select edges.
Face: Select faces.
Island: Select contiguous groups of faces.

Sync Selection On

When selecting UVs or Edges, it behaves like the Shared Vertex option of the Sticky Selection Mode. When selecting Faces, it behaves like the Disabled option of the Sticky Selection Mode.

Vertex: Select individual vertices.
Edge: Select edges.
Face: Select faces.

Sticky Selection Mode

This selector lets you enable automatic additional selection.

Shared Vertex: Selects UVs that share a mesh vertex, even if they are in different UV locations.
Shared Location: Selects UVs that are in the same UV location and share a mesh vertex.
Disabled: Disables Sticky Selection. When you move a UV in this mode, each face owns its own UVs, allowing them to be separated.

Menu

Box Select B

Click and drag to box select UV coordinates. Alternatively, use B to start box selection.

Box Select Pinned Ctrl-B

Use the box lasso to select only pinned UV coordinates.

Circle Select

See Circle Select.

Select All A

Selects all UV coordinates.

Select None Alt-A

Deselects all UV coordinate.

Inverse Ctrl-I

Inverts the current selection.

More/Less Ctrl-NumpadPlus, Ctrl-NumpadMinus

Expands/Contracts the selection to/from the adjacent elements of the selection type.

Select Pinned Shift-P

Selects all pinned UVs.

Select Linked

Linked Ctrl-L: This operator selects all UVs that are connected to currently selected UVs. This works similarly to the tools in 3D Viewport.
Shortest Path: Path between two selected elements.

Select Split Y

Cuts apart the selected UVs from the map. Only those UVs which belong to fully selected faces remain selected. As the name implies, this is particularly useful to unlink faces and move them elsewhere. The hotkey is analogous to the mesh Split tool.

Select Overlap

Selects any UVs that are extended over other UVs while also selecting any underlying UVs.

Shortest Path

Reference

Mode: Edit Mode
Menu: Select ‣ Select Linked ‣ Shortest Path
Shortcut: Ctrl-LMB

Selects all UV components along the shortest path from the active component to the one which was selected.

Face Stepping

Supports diagonal paths for vertices and faces, and selects edge rings with edges.

Topological Distance

Only takes into account the number of edges of the path and not the length of the edges to calculate the distances.

Fill Region Shift-Ctrl-LMB

Selects all elements in the shortest paths from the active selection to the clicked area.

Checker Deselect Options

Allows to quickly select alternate elements in a path.

Deselected: The number of deselected elements in the repetitive sequence.
Selected: The number of selected elements in the repetitive sequence.
Offset: Offset from the starting point.

Select Edge Loops

Reference

Mode: Edit Mode
Shortcut: Alt-LMB, or Shift-Alt-LMB for modifying existing selection.

Holding Alt while selecting a UV component selects a loop of edges that are connected in a line end-to-end, passing through the edge under the mouse pointer. Holding Shift-Alt while clicking adds to the current selection.