Fit only big images to desktop

`Shift` + `F`

All hotkeys for IrfanView 4.42 (Windows)

Browsing Load next / previous image in current directory	`Space` / `Backspace`
Browsing Load next / previous image in current directory (when not zoomed)	`Arrow Right` / `Arrow Left` / `Page Up` / `Page Down`
Browsing Next / previous page in a multipage image (e.g. a scan)	`Ctrl` + `Page Up` / `Page Down`
Browsing Move forward 1 - 9 images in the current directory	`Ctrl` + `1 ? 9`
Browsing Move backward 1 - 9 images in the current directory	`Ctrl` + `Shift` + `1 ? 9`
Browsing Load first / last image in current directory	`Ctrl` + `Home` / `End`
Browsing Load first / last image in current directory (when not zoomed)	`Home` / `End`
Browsing Tag / untag current image	`X` / `Shift` + `X`
Browsing Show tagged files in Thumbnails window	`Shift` + `Q`
File Handling Rename file	`F2` / `F6`
File Handling Batch convert or rename	`B`
File Handling Open	`O`
File Handling Properties	`P`
File Handling Save as?	`S`
File Handling Open image in external viewer/editor	`Shift` + `E`
File Handling Open random image from current directory	`Ctrl` + `M`
File Handling Open current image in new window	`Ctrl` + `N`
File Handling Print	`Ctrl` + `P`
File Handling Edit delete (NOTE: this command removes the file from the program\\\'s display, bit does NOT delete the file.)	`D`
File Handling Save dialog	`Ctrl` + `S`
File Handling Reopen	`Shift` + `R`
File Handling Direct print image (no dialog box)	`Ctrl` + `Alt` + `P`
File Handling New image	`Shift` + `N`
View / Zoom Toggle fullscreen mode	`Enter`
View / Zoom Toggle fit images to desktop and fit window to image	`F`
View / Zoom Refresh view	`F5` / `U`
View / Zoom Original size (reset zoom)	`Ctrl` + `H`
View / Zoom Fit image to window	`Shift` + `W`
View / Zoom Zoom in	`[` + `]` / `=`
View / Zoom Zoom out	`-`
View / Zoom Scroll image (when zoomed)	`Arrow Keys`
View / Zoom Scroll to the top / bottom of an image (when zoomed)	`Page Up` / `Page Down`
View / Zoom Scroll to the left / right edge of an image (when zoomed)	`Home` / `End`
View / Zoom Fit only big images to desktop	`Shift` + `F`
View / Zoom Lock/unlock zoom factor (applies to all loaded images)	`Shift` + `L`
View / Zoom Fit window to image	`Shift` + `O`
View / Zoom Toggle stretching image across all monitors	`Ctrl` + `Shift` + `W`
Basic Image Editing Horizontal flip	`H`
Basic Image Editing Vertical flip	`V`
Basic Image Editing Image information	`I`
Basic Image Editing Rotate 90 degrees left	`L`
Basic Image Editing Rotate 90 degrees right	`R`
Basic Image Editing Custom rotation dialog	`Ctrl` + `U`
Basic Image Editing Enhance colors	`Shift` + `G`
Basic Image Editing Sharpen	`Shift` + `S`
Basic Image Editing Auto color correction	`Shift` + `U`
Basic Image Editing Red eye reduction (on selected area)	`Shift` + `Y`
Copy / Paste / Select Delete image	`Delete`
Copy / Paste / Select Paste image	`Insert`
Copy / Paste / Select Move file	`F7`
Copy / Paste / Select Copy file	`F8`
Copy / Paste / Select Move the selection rectangle	`Shift` + `Arrow Keys`
Copy / Paste / Select Select/unselect all	`Ctrl` + `A`
Copy / Paste / Select Copy	`Ctrl` + `C`
Copy / Paste / Select Paste	`Ctrl` + `V`
Copy / Paste / Select Copy current image name	`Shift` + `P`
Copy / Paste / Select Cut	`Ctrl` + `X`
Copy / Paste / Select Crop image to selection	`Ctrl` + `Y`
Copy / Paste / Select Undo	`Ctrl` + `Z`
Copy / Paste / Select Auto crop image borders	`Ctrl` + `Shift` + `Y`
Copy / Paste / Select Create custom selection	`Shift` + `C`
Main Program Window Close current window or dialog,exit fullscreen view, or exit program	`Esc`
Main Program Window Help	`F1`
Main Program Window About Irfanview dialog	`A`
Main Program Window Stop .GIF animation	`G`
Main Program Window Thumbnails window	`T`
Main Program Window Switch focus between thumbnails window and main window	`Tab`
Main Program Window Cycle focus in the thumbnails window	`Ctrl` + `Tab`
Main Program Window Minimize the IrfanView window	`M`
Main Program Window Show/hide status bar	`Alt` + `Shift` + `S`
Main Program Window Show/hide toolbar bar	`Alt` + `Shift` + `T`
Main Program Window Show/hide menu bar	`Alt` + `Shift` + `M`
Main Program Window Show/hide window title and borders	`Alt` + `Shift` + `C`
Fullscreen Mode Toggle fullscreen mode	`Enter`
Fullscreen Mode Exit fullscreen mode	`Esc`
Fullscreen Mode Show image as original size (1:1)	`1`
Fullscreen Mode Fit only large images to screen	`2`
Fullscreen Mode Fit all images to screen	`3`
Fullscreen Mode Stretch all images to screen	`4`
Fullscreen Mode Fit image width to screen	`5`
Fullscreen Mode Fit image height to screen height	`6`
Fullscreen Mode Scroll to center of image	`num 5`
Fullscreen Mode Loop through full screen image fit options	`F`
Fullscreen Mode Show / hide the mouse in full screen mode (mouse reappears when moved)	`F11`
Fullscreen Mode Toggle text display in full screen mode	`N`
Fullscreen Mode Lock/unlock zoom factor (applies current zoom to all loaded images)	`Shift` + `L`
Slideshow Controls Add current image to slideshow	`F4`
Slideshow Controls Start/stop automatic viewing (windowed slideshow)	`Shift` + `A`
Slideshow Controls Start slideshow with current directory and images	`Ctrl` + `W`
Slideshow Controls Slideshow dialog	`W`
Slideshow Controls Pause / resume an automatic slideshow	`pause/break`
Tools and Dialogs Capture dialog	`C`
Tools and Dialogs Show image in HEX viewer	`F3`
Tools and Dialogs Paint dialog	`F12`
Tools and Dialogs Browse subfolders dialog	`Ctrl` + `B`
Tools and Dialogs Effects dialog	`Ctrl` + `E`
Tools and Dialogs Find	`Ctrl` + `F`
Tools and Dialogs Create grayscale image	`Ctrl` + `G`
Tools and Dialogs Edit multipage TIF file	`Ctrl` + `Q`
Tools and Dialogs Resample dialog	`Ctrl` + `R`
Tools and Dialogs Insert text into selection	`Ctrl` + `T`
Tools and Dialogs Interactive screenshot tool	`Ctrl` + `print`
Tools and Dialogs Focuss the toolbar edit field	`Shift` + `T`
Tools and Dialogs Change canvas size	`Shift` + `V`
Tools and Dialogs Acquire / batch scan dialog	`Ctrl` + `Shift` + `A`
Tools and Dialogs Comment dialog (for JPG images)	`Ctrl` + `Shift` + `M`
Tools and Dialogs Set image as wallpaper - centered	`Ctrl` + `Shift` + `C`
Tools and Dialogs Set image as wallpaper - tiled	`Ctrl` + `Shift` + `T`
Tools and Dialogs Set image as wallpaper - stretched	`Ctrl` + `Shift` + `S`
Tools and Dialogs Set image as wallpaper - previous wallpaper	`Ctrl` + `Shift` + `P`
Plugins Start OCR plugin on image or selection	`F9`
Plugins Show EXIF information	`E`
Plugins Filter Factory dialog	`K`
Plugins Open Adobe filters dialog (plugin required)	`Ctrl` + `K`
Plugins Show IPTC info	`Ctrl` + `I`
Plugins Email image	`Shift` + `M`
Plugins JPG lossless operations (plugin required)	`Shift` + `J`
Plugins Lossless JPG crop (Plugin required)	`Ctrl` + `Shift` + `J`
Plugins Lossless JPG rotation - left (Plugin required)	`Ctrl` + `Shift` + `L`
Plugins Lossless JPG rotation - right (Plugin required)	`Ctrl` + `Shift` + `R`