Paint vertical or horizontal lines

`↑ Shift` + `Mouse movement`

All hotkeys for Pixelmator Pro

Navigate an image Zoom in	`⌘ Cmd` + `+`
Navigate an image Zoom out	`⌘ Cmd` + `-`
Navigate an image Zoom to fit	`⌘ Cmd` + `0`
Navigate an image View actual size	`⌥ Option` + `⌘ Cmd` + `0`
Navigate an image Select Zoom tool	`Z`
Select tools Style	`S`
Select tools Arrange	`V`
Select tools Free Selection	`L`
Select tools Rectangular Selection	`M`
Select tools Elliptical Selection	`Y`
Select tools Color Selection	`W`
Select tools Quick Selection	`Q`
Select tools Paint	`B`
Select tools Erase	`E`
Select tools Color Fill	`N`
Select tools Gradient Fill	`G`
Select tools Repair	`R`
Shapes and vectors Draw a rectangle shape	`U`
Select tools Pen	`P`
Select tools Type	`T`
Select tools Crop	`C`
Select tools Effects	`F`
Select tools Slice and Save for Web	`K`
Open, save, an export images Create a new image	`⌘ Cmd` + `N`
Open, save, an export images Open an image	`⌘ Cmd` + `O`
Open, save, an export images Save an image	`⌘ Cmd` + `S`
Open, save, an export images Duplicate an image	`↑ Shift` + `⌘ Cmd` + `S`
Open, save, an export images Save an existing image as a new image	`⌥ Option` + `↑ Shift` + `⌘ Cmd` + `S`
Open, save, an export images Export an image	`⌘ Cmd` + `E`
Basic edits Undo last action	`⌘ Cmd` + `Z`
Basic edits Redo last action	`↑ Shift` + `⌘ Cmd` + `Z`
Selection tools Cut a selected area	`⌘ Cmd` + `X`
Selection tools Copy a selected area	`⌘ Cmd` + `C`
Selection tools Paste a selected area	`⌘ Cmd` + `V`
Basic edits Paste and match style	`⌥ Option` + `↑ Shift` + `⌘ Cmd` + `V`
Selection tools Duplicate a selected area	`↑ Shift` + `⌘ Cmd` + `D`
Work with layers Create an empty new layer	`↑ Shift` + `⌘ Cmd` + `N`
Work with layers Delete selected layer(s)	`⬅ Backspace`
Work with layers Select all layers	`⌥ Option` + `⌘ Cmd` + `A`
Work with layers Merge selected layers	`⌥ Option` + `⌘ Cmd` + `E`
Work with layers Merge all layers	`⌥ Option` + `↑ Shift` + `⌘ Cmd` + `E`
Work with layers Group layers	`⌘ Cmd` + `G`
Work with layers Ungroup layers	`↑ Shift` + `⌘ Cmd` + `G`
Work with layers Bring selected layer(s) forward	`⌘ Cmd` + `]`
Work with layers Send selected layer(s) to the front	`⌥ Option` + `⌘ Cmd` + `[`
Work with layers Bring selected layer(s) backward	`⌘ Cmd` + `8`
Work with layers Send selected layer(s) to the back	`⌥ Option` + `⌘ Cmd` + `]`
Arrange tool drag a layer handle: Rotate a layer	`⌘ Cmd` + `Mouse movement` + `Mouse left click`
Style tool Change brush hardness	`↑ Shift` + `+`
Style tool Cycle through blending modes	`↑ Shift` + `-`
Arrange tool drag a layer handle: Resize a layer	`Mouse movement`
Paint and erase drag gradient: Constrain gradient to 15º angle	`↑ Shift` + `Mouse movement`
Arrange tool Duplicate a layer	`⌥ Option` + `Mouse movement`
Arrange tool drag a layer handle: Resize a layer from the center	`⌥ Option` + `Mouse movement` + `Mouse left click`
Arrange tool drag a layer handle: Constrain the aspect ratio when resizing a layer	`↑ Shift` + `Mouse movement` + `Mouse left click`
Arrange tool Constrain the aspect ratio when resizing a layer from the center	`⌥ Option` + `↑ Shift` + `Mouse movement`
Arrange tool click the layer: Open the shortcut menu for the selected layer	`Control` + `Mouse movement` + `Mouse left click`
Arrange tool drag a layer handle: Rotate a layer in 15º steps	`↑ Shift` + `⌘ Cmd` + `Mouse movement` + `Mouse left click`
Selection tools Select the entire image	`⌘ Cmd` + `A`
Selection tools Deselect an active selection	`⌘ Cmd` + `D`
Selection tools Invert a selection	`↑ Shift` + `⌘ Cmd` + `I`
Selection tools Load the outline of a layer as a selection	`⌥ Option` + `⌘ Cmd` + `L`
Selection tools Turn on Refine Selection	`⌥ Option` + `⌘ Cmd` + `R`
Shapes and vectors Press and hold the Shift key before starting to draw: Unite a shape with the selected shape	`↑ Shift`
Shapes and vectors Press and hold the Option key before starting to draw: Subtract a shape from the selected shape	`⌥ Option`
Selection tools (Hold down the Shift and Option key before starting to select) Intersect a selection	`↑ Shift` + `⌥ Option`
Paint and erase Reset foreground and background colors to white and black	`D`
Paint and erase Switch between foreground and background color	`X`
Paint and erase Paint straight lines	`↑ Shift` + `Mouse left click`
Paint and erase (Doubleclick a brush) Open brush settings	`Mouse double click`
Paint and erase Paint vertical or horizontal lines	`↑ Shift` + `Mouse movement`
Paint and erase Navigate through brushes	`,`
Paint and erase Navigate through brushes	`.`
Paint and erase Increase or decrease brush size	`[`
Paint and erase Increase or decrease brush size	`]`
Paint and erase Change brush hardness	`↑ Shift` + `[`
Paint and erase Change brush hardness	`↑ Shift` + `]`
Clone tool Set clone source	`⌥ Option` + `Mouse left click`
Paint and erase Fill layer with foreground color	`⌘ Cmd` + `⬅ Backspace`
Paint and erase Fill layer with background color	`⌥ Option` + `⬅ Backspace`
Shapes and vectors Press and hold the Option and Shift key before starting to draw: Intersect a shape with the selected shape	`⌥ Option` + `↑ Shift`
General Show Pixelmator Pro preferences	`⌘ Cmd` + `,`
General View file info	`↑ Shift` + `⌥ Option` + `⌘ Cmd` + `I`
General Show Info bar	`⌘ Cmd` + `/`
General Hide toolbar	`⌥ Option` + `⌘ Cmd` + `T`
General Enter fullscreen	`Control` + `⌘ Cmd` + `F`
General Close window	`⌘ Cmd` + `W`
General Close all windows	`⌥ Option` + `⌘ Cmd` + `W`
General Show Next Tab	`Control` + `⭾ Tab`
General Show Previous Tab	`Control` + `↑ Shift` + `⭾ Tab`
General View All Tabs	`↑ Shift` + `⌘ Cmd` + `\`
General Cycle through windows	`⌘ Cmd` + `
General Minimize window	`⌘ Cmd` + `M`
General Minimize all windows	`⌥ Option` + `⌘ Cmd` + `M`
General Hide Pixelmator	`⌘ Cmd` + `H`
General Hide others	`⌥ Option` + `⌘ Cmd` + `H`
General Print	`⌘ Cmd` + `P`
General Quit Pixelmator Pro	`⌘ Cmd` + `Q`