Keyboard & Mouse Shortcuts¶

The most important shortcuts are always shown in the status bar at the bottom of the screen. These shortcut hints depend on the active tool and also change when modifiers are pressed to allow easy exploration of available functionality.

A complete listing of all available keyboard & mouse shortcuts for WEBKNOSSOS can be found below.

General¶

Key Binding	Operation
`Ctrl` / `Cmd` + `Z`	Undo
`Ctrl` / `Cmd` + `Y`	Redo
`Ctrl` / `Cmd` + `S`	Save
`I` or `Ctrl` / `Cmd` + Mousewheel	Zoom In
`O` or `Ctrl` / `Cmd` + Mousewheel	Zoom Out
`P`	Select Previous Comment
`N`	Select Next Comment
`3`	Toggle Segmentation Opacity
`H`	Increase the Move Value
`G`	Decrease the Move Value
`Q`	Download Screenshot(s) of Viewport(s)
`.`	Toggle Viewport Maximization
`K` , `L`	Toggle left/right Sidebars

Skeleton Annotation Mode¶

Key Binding	Operation
`M`	Toggle Mode (Orthogonal, Flight, Oblique)
`1`	Toggle Visibility of all Trees
`2`	Toggle Visibility of Inactive Trees
`Shift` + Mousewheel	Change Node Radius
`Ctrl` / `Cmd` + `Shift` + `F`	Open Tree Search (if Tree List is visible)
`F` or Mousewheel	Move Forward by a Single Slice
`D` or Mousewheel	Move Backward by a Single Slice

Orthogonal Mode¶

Note that skeleton-specific mouse actions are usually only available when the skeleton tool is active.

Key Binding	Operation
Left Mouse Drag or Arrow Keys	Move In-Plane
`Alt` + Mouse Move	Move In-Plane
`Space`	Move Forward
Scroll Mousewheel (3D View)	Zoom In And Out
Right-Click Drag (3D View)	Rotate 3D View
Left Click	Create New Node
Left Click	Select Node (Mark as Active Node) under cursor
Left Drag	Move node under cursor
Right Click (on node)	Bring up the context-menu with further actions
`Shift` + `Alt` + Left Click	Merge Two Nodes and Combine Trees
`Shift` + `Ctrl` / `Cmd` + Left Click	Delete Edge / Split Trees
`C`	Create New Tree
`Ctrl` / `Cmd` + `.`	Navigate to the next Node (Mark as Active)
`Ctrl` / `Cmd` + `,`	Navigate to previous Node (Mark as Active)
`Ctrl` / `Cmd` + Left Click or `Ctrl` / `Cmd` + Arrow Keys	Move the Active Node
`Del`	Delete Node / Split Trees
`B`	Mark Node as New Branchpoint
`J`	Jump To Last Branchpoint
`S`	Center Camera on Active Node

Note that you can enable Classic Controls which will behave slightly different and more explicit for the mouse actions:

Key Binding	Operation
Right Click	Create New Node
`Shift` + Left Click	Select Node (Mark as Active Node)

Flight / Oblique Mode¶

Key Binding	Operation
Left Click	Select Node (Mark as Active Node) under cursor
Left Mouse Drag or Arrow Keys	Rotation
`Space`	Move Forward
`Ctrl` / `Cmd` + `Space`	Move Backward
`I` / `O`	Zoom In And Out
`Shift` + Arrow	Rotation Around Axis
`R`	Invert Direction
`B`	Mark Node as New Branchpoint
`J`	Jump To Last Branchpoint
`S`	Center Active Node
`F`	Forward Without Recording Waypoints
`D`	Backward Without Recording Waypoints
`Del`	Delete Node / Split Trees
`Shift` + `Space`	Delete Active Node, Recenter Previous Node
`Shift` + `Alt` + Left Click	Merge Two Nodes and Combine Trees
`Shift` + `Ctrl` / `Cmd` + Left Click	Delete Edge / Split Trees

Volume Mode¶

Key Binding	Operation
Left Mouse Drag or Arrow Keys	Move (Move Mode) / Add To Current Segment (Trace / Brush Mode)
Right Click	Bring up context-menu with further actions
`Shift` + Left Click	Select Active Segment
`Ctrl` / `Cmd` + Left Mouse Drag	Add Voxels To Current Segment while inverting the overwrite-mode (see toolbar for overwrite-mode)
`Ctrl` / `Cmd` + `Shift` + Left Mouse Drag	Remove Voxels From Segment
`Alt` + Mouse Move	Move
`C`	Create New Segment
`Shift` + Mousewheel or `Shift` + `I` / `O`	Change Brush Size (Brush Mode)
`V`	Interpolate current segment between last labeled and current slice

Note that you can enable Classic Controls which won't open a context menu on right-click, but instead erases when the brush/trace tool is activated.

Key Binding	Operation
Right Mouse Drag	Remove Voxels
`Ctrl` / `Cmd` + Right Mouse Drag	Remove Voxels while inverting the overwrite-mode (see toolbar for overwrite-mode)

Tool Switching Shortcuts¶

Note that you need to first press Ctrl / Cmd + K, release these keys and then press the letter that was assigned to a specific tool in order to switch to it.
Ctrl / Cmd + K is not needed for cyclic tool switching via W / Shift+W.

Key Binding	Operation
`W`	Cycle Through Tools (Move / Skeleton / Trace / Brush / ...)
`Shift` + `W`	Cycle Backwards Through Tools (Move / Proofread / Bounding Box / Pick Cell / ...)
`Ctrl` / `Cmd` + `K` , `M`	Move Tool
`Ctrl` / `Cmd` + `K` , `S`	Skeleton Tool
`Ctrl` / `Cmd` + `K` , `B`	Brush Tool
`Ctrl` / `Cmd` + `K` , `E`	Brush Erase Tool
`Ctrl` / `Cmd` + `K` , `L`	Lasso Tool
`Ctrl` / `Cmd` + `K` , `R`	Lasso Erase Tool
`Ctrl` / `Cmd` + `K` , `P`	Segment Picker Tool
`Ctrl` / `Cmd` + `K` , `Q`	Quick Select Tool
`Ctrl` / `Cmd` + `K` , `X`	Bounding Box Tool
`Ctrl` / `Cmd` + `K` , `O`	Proofreading Tool

Note that you need to first press Ctrl / Cmd + K, release these keys and press the suitable number.

Key Binding	Operation
`Ctrl` / `Cmd` + `K` , `1`	Switch to small brush
`Ctrl` / `Cmd` + `K` , `2`	Switch to medium sized brush
`Ctrl` / `Cmd` + `K` , `3`	Switch to large brush

Key Binding	Operation
`Shift` + Click on a mesh in the 3D viewport	Move the camera to the clicked position
`Ctrl` / `Cmd` + Click on a mesh in the 3D viewport	Select the mesh and its segment ID

Agglomerate File Mapping Skeleton¶

The following binding only works in skeleton/hybrid annotations and if an agglomerate file mapping is activated.

Key Binding	Operation
`Shift` + Middle Click	Import Skeleton for Selected Segment

This video demonstrates an annotation workflow using some keyboard shortcuts:

Classic Controls¶

Note that you can enable Classic Controls in the left sidebar. Classic controls are provided for backward compatibility for long-time users and are not recommended for new user accounts. Hence, Classic controls are disabled by default, and WEBKNOSSOS uses a more intuitive behavior which assigns the most important functionality to the left mouse button (e.g., moving around, selecting/creating/moving nodes). The right mouse button always opens a context-sensitive menu for more complex actions, such as merging two trees. With classic controls, several mouse controls are modifier-driven and may also use the right-click for actions, such as erasing volume data.