Chrome · Open DevTools

DevTools

Windows · Linux

F12

Mac

Cmd+Option+I

Opens DevTools on whichever panel you had open last; on Windows Ctrl+Shift+I does the same thing.

Reopening a closed tab (Ctrl/Cmd+Shift+T) and jumping to the address bar (Ctrl/Cmd+L) alone cut most of your trips to the mouse.

Reading the key names

Keys joined by + are pressed together: Ctrl+Shift+P means hold Ctrl and Shift, then P.
On a Mac, Cmd is ⌘, Option is ⌥ (labelled Alt on some keyboards), Control is ⌃ and Shift is ⇧.
Windows Ctrl usually becomes Cmd on a Mac, but not always — this reference lists both combinations separately.
With a Korean, Japanese or Chinese input method active, shortcuts built on letter keys may not fire. Switch to Latin input and try again.
When a combination does nothing, another program has often claimed it as a global shortcut first.

Q. What is the shortcut for Open DevTools in Chrome?

Opens DevTools on whichever panel you had open last; on Windows Ctrl+Shift+I does the same thing. It is F12 on Windows and Cmd+Option+I on a Mac.

Q. Is it the same on Windows and Mac?

No — F12 on Windows, Cmd+Option+I on a Mac.

Q. How many keys is that?

1 pressed together. The combination sits under DevTools in Chrome.