Keyboard shortcuts

The keys work wherever the mouse is in the editor, but not while you're typing in a field. On a Mac, use Cmd in place of Ctrl.

Selecting

Key	What it does
1, 2, 3, 4	Vertices, Edges, Faces or Islands selection mode
A	Select everything, or nothing if everything is selected already
Shift, held	Click adds to or takes from the selection
Esc	Select nothing, and leave Relax mode

Editing

Key	What it does
Arrow keys	Nudge the selection in the UV Layout
J	Weld the selection's UV cut back together
P	Pin or unpin the selected vertices
G	Group the selected islands
Shift+G	Release the selected islands from their group
Ctrl+Z	Undo
Ctrl+Shift+Z or Ctrl+Y	Redo

Viewing

Key	What it does
F	Frame the selection in the view under the mouse, or in both. With nothing selected, the whole model and the 0-1 square
Space, held	Over the UV Layout: drag to pan
Space, tapped	Over the UV Layout: switch Include touching for box selection. Over the 3D View: start or stop the turntable
Alt, held	Over the UV Layout: a corner handle scales from the middle

In the timeline

With the timeline's ruler focused, the arrow keys step a frame back or on, or ten with Shift. Page Up and Page Down go ten frames, and Home and End go to the first and last.