Common Keyboard Shortcuts

Shortcut	Action
+	Zoom in
-	Zoom out
Ctrl/Command + L	Focus search bar
Ctrl/Command + S	Save
(No shortcut)	Save As
Ctrl/Command + Shift + C	Adjust Brightness and Contrast
Ctrl/Command + Shift + Z	Color channel control
Ctrl/Command + Z	Undo
Ctrl + H (Windows) H (Mac)	Open Histogram
Ctrl/Command + K	Plot / Line Profile
Ctrl/Command + M	Measure
Ctrl/Command + Shift + T	Threshold
Shift	Draw straight lines
Alt + Arrow Keys	Change current selection size
T	Open ROI (Region of Interest) Manager and add current selection as ROI
Ctrl/Command + Shift + W	Close all windows

Also Helpful

• Window > Tile
  Montages all open images/windows.

• Image > Transform
  Flip or rotate images.

• Help > Update
  Update FIJI.

• Enter (when focused on an image)
  Surfaces the ImageJ main toolbar window.