Everywhere

Keys	What it does
Ctrl+O	Open PDF files in the viewer
Ctrl+K	Quick search: tools and recent files
Ctrl+,	Settings
F11	Full screen

Viewer

Keys	What it does
Ctrl+F	Find in document
Enter / Shift+Enter	Next / previous match
Ctrl+P	Print (Mergi's print dialog)
Ctrl+Shift+P	Print with the Windows dialog
Ctrl+S	Save the answers of a form
Ctrl+T	Open more files in new tabs
Ctrl+W	Close the tab
Ctrl+C	Copy the selected text
Ctrl+A	Select all the text
Ctrl+plus / Ctrl+minus	Zoom in / out
Ctrl+0	100%
Ctrl+wheel	Zoom
Page Up / Page Down	Scroll up / down by a screen
Home / End	First / last page
Arrow keys	Scroll; Left / Right turn the page when it fits the width
Space / Shift+Space	Scroll down / up by a screen
Space (hold)	Hand tool: drag the page
Escape	Clear the selection

Keys	What it does
Right / Left	Next / previous step
Escape	Skip the tour