JOSM Keyboard Shortcuts

The following shortcuts are the default setting (list is probably outdated).

A	Add / Draw nodes
Shift-A	Cycle through the different Auto zoom modes
C	Combine Ways
D	Delete nodes or ways. Pressing Ctrl forces delete, even if the object is in use.
N	Add a new node or insert a new node into a way
P	Split Way
R	Reverse Way
S	Select objects
U	Unselect All
X	Stretch a part of a way (create a building or something else)
O	Align nodes in circle
L	Align nodes into a straight line
Q	Orthogonalize Shape
M	Join Nodes
J	Join Node to Way
G	Split Node
+	Zoom in
-	Zoom out
Shift-Click	Holding the "Shift" key when in select mode adds new element to existing selection.
Shift-Click	Holding the "Shift" key when in add mode turns of snapping to existing nodes.
Shift-Click	Holding the "Shift" key when in delete mode and clicking on a way segment only deletes this waysegment and not whole way.
Ctrl-Click	Holding the "Ctrl" key when in select mode toggles element selection.
Ctrl-Click	Holding the "Ctrl" key when in add mode prevents snapping on existing ways and nodes.
Ctrl-Click	Holding the "Ctrl" key when in delete mode deleteas object and references (i.e. ways using this node).
Ctrl-Alt	Holding the "Alt" and "Ctrl" key when in select mode allows rotating selected objects.
Alt-Click	Holding the "Alt" key when in add mode creates a separated though connected way (same you could do afterwards by selecting a node and press P). This mode is marked by a small bar at the previous node.
Alt-Click	Holding the "Alt" key when in delete mode and clicking on a way only deletes the way without its nodes.
Z	Zoom in by dragging
Alt-A	Toggle display on / off of Authors dialog
Alt-C	Toggle display on / off of Conflict dialog
Alt-E	Toggle display on / off of Selection list dialog
Alt-H	Toggle display on / off of Display history dialog (history is not fully implemented yet)
Alt-L	Toggle display on / off of Layers dialog
Alt-R	Toggle display on / off of Relations dialog
Alt-O	Toggle display on / off of Command stack (the undo buffer)dialog
Alt-P	Toggle display on / off of Property for selected objects dialog
Alt-V	Toggle display on / off of validation dialog (requires plugin)
Ctrl-A	Select all
Ctrl-C	Copy Way/Node etc to buffer
Ctrl-X	Cut Way/Node etc to buffer
Ctrl-V	Paste from buffer
Ctrl-Shift-A	Unselect all
Ctrl-Shift-D	Download
Ctrl-Shift-Alt-D	Download incomplete ways
Ctrl-Shift-U	Upload
Ctrl-Shift + left Mousebutton	rotate a object
Ctrl-Right	Pan display window
Ctrl-Left	Pan display window
Ctrl-Up	Pan display window
Ctrl-Down	Pan display window
Ctrl-,	Zoom in
Ctrl-.	Zoom out
Ctrl-Z	Undo
Ctrl-Y	Redo
Ctrl-N	New file
Ctrl-O	Open file
Ctrl-S	Save file
Ctrl-Shift-S	Save as
Ctrl-E	Export to GPX
Ctrl-F	Search
Ctrl-Q	Exit Application
Ctrl-W	Toggle between wireframe and mappaint mode
F1	Help
Shift-F1	About screen (with JOSM version number)
Ctrl-F1	Popup tooltip of current selected action
F12	Preferences
Space	Activate the last used action again.
1	Zoom to data
2	Zoom to layer
3	Zoom to selection
4	Zoom to conflict