To maximize efficiency, Labelo offers a range of keyboard shortcuts that enable users to perform common tasks quickly without the need for extensive mouse navigation. These shortcuts help in speeding up the annotation process, reducing repetitive actions, and improving overall workflow.

The table below outlines the hotkeys for a standard keyboard. If you are using a Mac keyboard, please substitute “Return” for “Enter,” “Delete” for “Backspace,” and “Option” for “Alt.”

Key	Explanation
Ctrl + enter	Submit the current task.
Alt + enter	Modify an existing task.
Ctrl + backspace OR cmd + backspace	Remove all regions.
escape	Exit relation mode or deselect the current region.
backspace	Delete the selected region.
Alt + r	Establish a relation between regions when one is selected.
Alt +.	Navigate through regions in the order they appear in the sidebar.
Alt + h	Hide the currently selected region.
Ctrl + d OR cmd + d	Clone the selected region.
u	De-select the current region.
Shift + down	In the data manager, move to the next row below the current one. The quick view for the selected row will automatically display.
Shift + up	In the data manager, move to the previous row above the current one. The quick view for the selected row will automatically display.
Shift + right	Access the labeling quick view for the selected task in the data manager.
Shift + left	Exit the labeling quick view for the selected task in the data manager.

Image – specific Hotkeys

When annotating image data with tags such as Rectangle, BrushLabels, Ellipse, Polygon, or KeyPoints, you can utilize specific hotkeys to perform actions tailored for image labeling.

Key	Explanation
h	Pan the image after zooming in.
v	Choose the mouse pointer tool.
Alt + left arrow	Choose the cursor tool.
Alt + right arrow	Rotate the image clockwise.
Ctrl + +	Zoom in on the image.
Ctrl + –	Zoom out from the image.
k	For key point labeling, select the key point tool in the toolbar.
e	Select the eraser tool in the toolbar.
b	For brush mask labeling, choose the brush tool in the toolbar.
[	When using the brush or eraser tool, reduce the brush or eraser size.
]	When using the brush or eraser tool, make the brush or eraser smaller.

Time series-specific Hotkeys

Certain hotkeys can be utilized to execute actions on a selected region within the data when annotating time series data using the TimeSeries tag.

Key	Explanation
Left arrow	Extend the region area to the left.
Right arrow	Extend the region area to the right.
Alt + Left arrow	Shrink the region area on the left.
Alt + Right arrow	Shrink the region area on the right.
Shift + Left arrow	Expand the region area significantly to the left.
Shift + Right arrow	Expand the region area significantly to the right.
Shift + Left arrow	Reduce the region area considerably on the left.
Shift + Right arrow	Reduce the region area considerably on the right.

Video-specific Hotkeys

When annotating video data with the Video tag, you can use specific hotkeys to execute actions tailored for video labeling.

Key	Explanation
Alt + spacebar	Play or pause video.
Alt + left arrow	Play or pause the video.
Alt + right arrow	Fast forward one frame.

In conclusion, Labelo’s keyboard shortcuts significantly enhance productivity by streamlining the annotation process, minimizing repetitive tasks, and optimizing the overall workflow for users.