Keyboard Shortcuts

A / D

Previous / next image

Shift+D

Mark the image as done (its boxes are saved first) and open the next image

S, Ctrl+S

Save

Alt+S

Save, open the next image and copy these boxes onto it

V

Take the boxes of the previous image in the list (adjust, then save)

Ctrl+C / Ctrl+V

Copy the selected box (or all boxes) / paste them, also on another image; paste with no box selected (Cmd+V on a Mac)

T

Place a box of the current label’s template at the mouse pointer

Ctrl+Z, Ctrl+Shift+Z / Ctrl+Y

Undo, redo (every box change is a step)

, / .

History open: show the next older / newer saved version

N

New box as a center-line rectangle: click bottom, click top, then click for the width

E

New box as an edge rectangle: click both ends of the bottom edge, then click for the height

Double-click

New box in the mode used last

Right-click, Delete

Delete the selected box (or cancel drawing)

R / Shift+R

Bottom edge (0°) of the selected box one side on, clockwise / counter-clockwise; the outline stays

P

Suggest boxes (if the server has a box suggestion service)

Enter

Accept the selected suggested box

1 – 9

Apply label to the selected box

Arrow keys

Move the selected box by 1 pixel (Shift: 10 pixels)

Ctrl / Shift + I J K L

Move 1 / 10 pixels up, left, down, right

Ctrl / Shift + U O

Rotate 1° / 10° counter-clockwise, clockwise

Ctrl / Shift + V B

Height − / + 1 / 10 pixels

Ctrl / Shift + N M

Width − / + 1 / 10 pixels (the browser keeps Ctrl+N for itself: use Shift+N)

F, + / −, Z

Fit image, zoom in / out (the mouse wheel zooms too), 1:1

M

Magnifier with crosshair at the mouse pointer on / off

C

Center lines (along and across each box through its centre) on / off

Drag empty area, Alt + drag

Move the image

Esc

Cancel drawing, deselect