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List of default keys

From the Portal Wiki

This is a list of the default controls for the PC version of Portal 1 & 2. All keys are user-definable in the game Options, via the Developer Console.

Movement

Action Key/Button
Move forward W
Move back A
Move left (Strafe) S
Move right (Strafe) D
Jump SPACE
Duck (Crouch) CTRL

Actions

Action Key/Button
Fire Blue Portal  
Fire Orange Portal  
Use Item (Buttons, Machines, ...) E
Toggle Zoom  
Zoom In  
Zoom Out  

Co-op

Action Key/Button
Partner Remote View Tab ⇆
Ping Tool (or Communication Menu) F
Gesture menu Q
Push To Talk Key C
Chat Message T

Miscellaneous

Action Key/Button
View Leaderboard <none>
Take Screen Shot F5
Quick Save F6
Quick Load F7
Pause Game PAUSE
Quit Game <none>
Toggle Developer Console ~

Miscellaneous Movement Key/Button

Action Key/Button
Turn Left <none>
Turn Right <none>
Look Up <none>
Look Down <none>
Strafe Modifier <none>
Keyboard Look Modifier <none>