Key

Description

Any marquee tool (except single column and single row), press space+drag

Reposition marquee while selecting

Any selection tool+shift+drag

Add to a selection

Any selection tool+alt+drag

Subtract from a selection

Any selection tool (except Quick Selection tool)+shift-alt+drag

Intersect a selection

shift+drag

Constrain marquee to square or circle (if no other selections are active)

alt+drag

Draw marquee from center (if no other selections are active)

shift+alt+drag

Constrain shape and draw marquee from center

ctrl

Switch to Move tool (except when Hand, Slice, Path, Shape, or any Pen tool is selected)

alt+drag

Switch from Magnetic Lasso tool to Lasso tool

alt+click

Switch from Magnetic Lasso tool to polygonal Lasso tool

enter/esc or ctrl+. (period)

Apply/cancel an operation of the Magnetic Lasso

Move tool+alt+drag selection

Move copy of selection

Any selection+arrow keys

Move selection area 1 pixel

Move tool+arrow keys

Move selection 1 pixel

ctrl+arrow keys

Move layer 1 pixel when nothing selected on layer

Magnetic Lasso tool+[ / ]

Increase/decrease detection width

Crop tool+enter or esc

Accept cropping or exit cropping

/ (forward slash)

Toggle crop shield off and on

Ruler tool+alt+drag end point

Make protractor

shift+drag guide

Snap guide to ruler ticks (except when View Snap is unchecked)

alt+drag guide

Convert between horizontal and vertical guide