Add Comments or metadata to an image

`C` / `Ctrl` + `M`

All hotkeys for gThumb (Linux)

User Interface Show/Hide the sidebar in the browser mode The sidebar contains the folder tree and the file properties summary (if enabled)	`F9`
User Interface Show the file properties summary	`I`
User Interface Shows/hides the thumbnail pane in the viewer mode	`F8`
User Interface Toggles the fullscreen mode	`F11` / `F`
User Interface Shows/hides the Thumbnails in the browser mode	`Ctrl` + `T`
User Interface Closes the viewer or fullscreen mode	`Esc`
Editing Edit the image and Opens the viewer and shows the editing tools	`E`
Editing Open the image with the GNU Image Manipulation Program (GIMP)	`G`
Editing Rename the image	`F2`
Editing Add Comments or metadata to an image	`C` / `Ctrl` + `M`
Editing Rotate right, losslessly if possible The file is saved automatically	`]`
Editing Rotate left, losslessly if possible The file is saved automatically	`[`
Editing Move the selected files to the Trash	`Delete`
Editing Delete the selected files permanently	`Shift` + `Delete`
Editing in Viewer Mode Adjust contrast	`A`
Editing in Viewer Mode Flip image	`L`
Editing in Viewer Mode Mirror image	`M`
Editing in Viewer Mode Rotate right	`R`
Editing in Viewer Mode Rotate left	`R`
Editing in Viewer Mode Crop image	`C`
Editing in Viewer Mode Resize image	`S`
Viewer View the next image	`Spacebar` / `Page Down`
Viewer View the previous image	`Backspace` / `Page Up`
Viewer View the first image	`Home`
Viewer View the last image	`End`
Viewer Add the current location to the bookmarks	`Ctrl` + `D`
Viewer Zoom in	`+`
Viewer Zoom out	`-`
Viewer Actual size	`1` / `Z` / `Numpad /`
Viewer Zoom to fit (scales down only, does not magnify)	`X` / `Numpad *`
Viewer Zoom to fit (scale down or magnify, as required)	`Shift` + `X`
Viewer Zoom to fit Width (scales down only, does not magnify)	`W`
Viewer Zoom to fit Width (scale down or magnify, as required)	`Shift` + `W`
Viewer Zoom to fit Height (scales down only, does not magnify)	`H`
Viewer Zoom to fit Height (scale down or magnify, as required)	`Shift` + `H`
Viewer Scroll the image	`Arrow Keys`
Viewer Scroll the image faster	`Shift` + `Arrow Keys`
Navigation Go to the first file in the browser view	`Home`
Navigation Go to the last file in the browser view	`End`
Navigation Scroll downwards through the thumbnails	`Down Arrow` / `PgDn`
Navigation Scroll upwards through the thumbnails	`Up Arrow` / `PgUp`
Navigation Go back to the previously viewed folder	`Alt` + `Left Arrow`
Navigation Go forward (after going back to a folder)	`Alt` + `Right Arrow`
Navigation Go up one level	`Alt` + `Up Arrow`
Slideshow Start a slideshow	`F5`
Slideshow Pause/Unpause the slideshow	`P`
Slideshow Close the slideshow	`Esc` / `Q`
Slideshow Load the next image	`Spacebar` / `Down Arrow`
Slideshow Load the previous image	`Backspace` / `Up Arrow`