Project File / View

FunctionWindowsMac
Create new project fileCtrl + N⌘N
Create new mind mapCtrl + T⌘T
SaveCtrl + S⌘S
Print currently-opened diagramCtrl + P⌘P
CloseCtrl + Q⌘Q
Show/Hide Project ViewCtrl + ⇧ + P⌘ + ⇧ + P

Diagram Editor

FunctionWindowsMac
Close DiagramCtrl + W⌘W
Switch Diagram TabsCtrl + Tab
Ctrl+Shift+TAB
Ctrl+PageUp or PageDown		Ctrl + Tab
Ctrl+Shift+TAB
Ctrl+PageUp or PageDown
Move to Next DiagramAlt + →⌥ + →
Move back to Previous DiagramAlt + ←⌥ + ←
Show Diagram in Actual SizeCtrl + 1⌘1
Show Entire DiagramCtrl + 0 (zero)⌘0 (zero)
Zoom InCtrl + Wheel up,
Ctrl + right-drag up,
Ctrl + [		⌘/
Zoom OutCtrl + Wheel down,
Ctrl + right-drag down,
Ctrl + ]		⌘-
ScrollRight-dragRight-drag

Basic Editing

FunctionWindowsMac
RenameF2F2
Ctrl + E
Wrap text⇧ + Enter
Ctrl + Enter		⇧ + Enter
⌘Enter
Make straight lineCtrl + L⌘L
Make Right-angle lineCtrl + E⌘E
Select allCtrl + A⌘A
Delete from Project File (*)Ctrl + D⌘D
Delete from current-opened diagram (*)DeleteFn + Delete
UndoCtrl + Z⌘Z
RedoCtrl + Y⌘Y
SearchCtrl + F⌘F
CopyCtrl + C⌘C
Copy as BMP/PNGCtrl + Alt + C⌘ + ⌥ + C
Copy as EMFCtrl + ⇧ + CN/A
PasteCtrl + V⌘V
Add HyperlinkCtrl + K⌘K

(*) Two ways to delete models in Astah

Alignment

FunctionWindowsMac
Align TopCtrl + Alt + ↑⌘ + ⌥ + ↑
Align Horizontal CenterCtrl + Alt + Minus⌘ + ⌥ + -
Align BottomCtrl + Alt + ↓⌘ + ⌥ + ↓
Align RightCtrl + Alt + →⌘ + ⌥ + →
Align Vertical CenterCtrl + Alt + I⌘ + ⌥ + I
Align LeftCtrl + Alt + ←⌘ + ⌥ + ←